Tenmat FF107 Explained.

FF107 Intumescents: glowing embers, grey layered panels, black background.

Discover how Tenmat’s FF107 advanced intumescent material is used in ember-resistant vents, fire collars, pipe and duct fire wraps to bring the presence of passive fire protection into a wide range of industries.

In today’s world of construction, intumescents are no longer unfamiliar material in the practice of passive fire protection. Known for their versatility and adaptability, intumescent materials have become one of the key components in the development of advanced passive fire protection solutions.

Developed to meet various expansion ratios + char output, Tenmat’s Advanced Intumescent Materials and Solutions are built to handle diverse and complex applications with ease. From mass timber construction to ember-resistant vents, our advanced intumescent materials have been utilized in passive fire protection solutions to meet the rigorous demands of a broad range of applications.

Among our portfolio, Tenmat’s FF107 material is considered one of the most versatile intumescent materials we offer. Let’s take a closer look at how Tenmat’s FF107 is redefining the standards of fire protection, from its ability to protect a building from both external and internal fire outbreaks.

Why Should You Develop with the FF107 Material?

TENMAT FIREFLY 107 is a high-performance intumescent material engineered for rapid activation and powerful expansion under heat exposure. Its unique formulation delivers a fast reaction time, generating a high level of pressure and volume to form a strong barrier against heat and flame spread.

Four large stone slabs and six narrow strips arranged together on a white background.

What sets FF107 apart from other traditional firestopping methods is its ability to produce a dense, solid char with excellent structural integrity – ensuring consistent protection and durability in demanding life safety conditions.

In addition to its high expansion and pressure generation characteristics, the FF107 has been tested according to ASTM E84 (UL 723) to measure its surface burning characteristics and achieved a Flame Spread Index of 0 and Smoke Developed Value of 0.

Tenmat FF107 is tested according to the current UL requirements and is a Recognized Component under UL Category OEXX2 for Intumescent Materials – Component. This combination of fast response, high expansion, and reliable char formation makes FireFly FF107 a trusted fire-rated material to use in the creation of fire-resistance rated applications.

How does Tenmat apply its FF107 material in mass timber construction?

Close-up of a wooden joint with a gray concrete or stone block set into the wood.

As the International Building Council (IBC) adopts more sustainable construction practices, architects and engineers have been challenged to integrate these standards into their designs. In response to this shift, innovative building methods have gained traction – one of the most prominent being mass timber construction.

 

Mass timber construction is built using a category of engineered wood products typically made of large, solid wood panels, columns or beams often manufactured off-site for load-bearing wall, floor, and roof construction.

It offers sustainability, design flexibility, efficiency, structural performance, and a myriad of other advantages, which position it as a prime candidate for sustainable building practices.

For joint and gap sealing applications in cross-laminated timber (CLT), and glulam, Tenmat has developed a state-of-the-art intumescent material, the FF107.

Tenmat’s FIREFLY 107 is an exceptionally powerful intumescent which combines fast reaction with high expansion and pressure generation – producing a solid char of good integrity. With its composition, the FF107 is applicable in construction joints and gaps.

When specified into construction joints and gaps, the FF107 slows the acceleration of flame and heat spread during an outbreak – ensuring these gaps do not compromise the structure’s integrity.

Learn More about Tenmat’s FF107 in Mass Timber Construction Here.

 

How does FF107 play a role in Ember-Resistant Vents?

Two metal air vent covers, one standing and one leaning, on a white background.

In high-risk wildfire zones (WUI zones), California building code officials now require new construction buildings to incorporate ember-resistant vents into their residential designs. Why? To protect residential homes from self-igniting during a wildfire outbreak.

When homeowners integrate an air ventilation system into their homes, each one of the vents act as prime entry point for hot embers and flames. To protect these entry points without compromising the air flow, homeowners install ember-resistant vents, such as BrandGuard Vents, into their residences to keep out these unwanted guests.

Now, here is where Tenmat FF107 plays a major role. Unlike other ember-resistant vent technology, BrandGuard incorporates Tenmat’s FF107 strips into its vent’s technology. When temperatures rise to dangerous levels in a wildfire, these strips expand rapidly to seal vent openings. This reaction effectively blocks embers and prevents flames from entering one’s household.

With the FF107’s fast reaction and highly expansive properties, BrandGuard’s Ember-Resistant Vents can react when it matters most.

Explore BrandGuard Vents Ember- and Flame-Resistant Vents.
Learn more about California’s Chapter 7A.  

Final Notes

With its rapid expansion, high-pressure generation, and solid char formation, Tenmat’s FF107 material delivers reliable performance across a wide range of applications – from sealing off gaps in mass timber construction to safeguarding homes in WUI zones through ember-resistant technology.

As building codes and fire safety regulations evolve, the demand for advanced fire-resistant materials continues to grow. Tenmat leads the way with innovative products like FF107, helping builders, architects, and homeowners enhance fire resilience and meet modern safety standards.

Passive Fire Protection and Tenmat.

Collage showing fire protection systems with the text: The Evolution of Passive Fire Protection.

Explore how Tenmat’s Advanced Intumescent Solutions and Materials have shaped the future of passive fire protection in modern-day construction.

As of 2024, the United States is home to 19,479 cities, towns, and villages – each containing an even greater number of communities. Now, each community can contain a multitude of different structures. Some contain bustling shopping malls, others are developing new multi-family complexes, certain ones include a wide range of various healthcare centers, and a number of them hold all the above and more.

Not one community is the exact same. But every community wants to protect the people and property within theirs. Therefore, whenever a community is getting a “face lift” or expanding internally or externally, life safety is the No.1 priority of the growing community.

To uphold this priority, communities need to prepare its redeveloping or new-construction buildings to withstand all potential disasters – especially the unexcepted ones.

The Beginning of Passive Fire Protection

Fire outbreaks have always been known to negatively impacted communities, especially when it comes to protecting properties and the lives within them. Over hundreds of years, countless safety measures have been put into place to fight off the potential damage of fires. From fire extinguishers to automated sprinkler systems, building code officials, construction professionals, and community members believed that they all their bases were covered.

However, this assumption was incorrect. Before 2006, unprotected openings were an unrecognized life safety hazard in many communities. These openings included openings created from recessed lights, in-ceiling loudspeakers, wires, cables, etc. Without being properly reinforced, these openings acted as a catalyst for the fire. Without these openings being improperly fire-rated, heat, smoke, and flames can spread rapidly throughout the building – endangering the integrity of the building and the lives of its occupants.

As a result of this discovery, the 2006 International Building Code adopted several building codes which required construction professionals to reinstate the fire-resistance rating of a wall, ceiling, or floor assembly. This is where we introduce the concept of passive fire protection.

Passive Fire Protection is the system which slows or prevents the spread of fire within a building – utilizing fire-rated materials and solutions to achieve this.  This system works by using fire-rated solutions, such as intumescent recessed light covers, to contain fire, heat, and smoke, by limiting heat and fire spread to a single compartment within the building.

Causing fires to become smaller and contained, passive fire protection (PFP) systems have the ability to increase the response time for first responders and provide additional evacuation time for the building’s occupants.

Tenmat’s POV: The Importance of Passive Fire Protection

Following the building code adoptions, construction professionals were seeking PFP solutions and materials that can resolve the unprotected openings within their design details. However, construction professionals struggled to find a fire-rated solution, which has been

  1. Properly tested and certified by an accredited third-party testing laboratory,
  2. Fitted to meet the design requirements of the application, and
  3. Engineered to be easily installed into a wide range of building types.

Dedicated to protecting the safety of present and future communities, Tenmat developed an adaptable form of passive fire protection technology, intumescents. With the release of this technology, construction professionals were now able to meet local building codes while simultaneously fulfilling their design concepts.

Through our manufacturing capability to produce intumescents, which offer various expansion rates and char production, Tenmat’s Advanced Intumescents can protect a wide range of unprotected openings.

With this versatility, our intumescents can be specified into a diverse range of unprotected openings. From ventilated air cavities in a rainscreen assembly to recessed fixtures in a fire-rated ceiling assembly, Tenmat’s Advanced Intumescent Materials and Solutions can reinforce the integrity of these fire-resistance rated assemblies.

Intumescents in Passive Fire Protection

As previously mentioned, our Intumescent Solutions and Materials can meet the design requirements + passive fire protection standards of a wide range of building types. To discover our capabilities for each popular building type, please explore our quick overview.

 

Modern home theater with a large screen, cozy sofa, and blue accent lighting; Audio text above.Rows of black server racks in a data center with Data Centers text and a More Information button.Classroom with round tables, chairs, bookshelves, TV, and a whiteboard; Education text at the top.A modern building facade with reflective glass panels and Facades text in bold red letters.

 

Hospital hallway with white floors and walls, labeled “Healthcare,” and a “More Information” button.Spacious, modern hospitality lobby with wooden furniture, large windows, and warm lighting.Modern white office building by a pond, labeled Industrial/Commercial. More Information button shown.Close-up of a mass timber joint with a gray insulation layer, and text reading Mass Timber and More Information.Several modular buildings under construction inside a large industrial warehouse, with Modular text above.Modern multi-family apartment building with large windows, under a clear blue sky, and a More Information button.

Enforcing Life Safety + Passive Fire Protection

Even though, Tenmat’s Solutions and Materials evolved alongside modern construction – the visibility of passive fire protection in modern construction remains on the lower side. Admittedly, this lack of visibility remains valid, due to the extensive, ongoing list of safety measures code officials and construction professionals are required to memorize and specify.

On top of curating our wide range of Advanced Intumescent Solutions and Materials, Tenmat is dedicated to educating local building code officials and construction professionals about unprotected openings in numerous building types. To encourage these individuals to gain more knowledge about these life safety hazards, we offer free 1-1 educational webinars for anyone who may be interested.

Schedule Your Free Educational Webinar Here.

AIA Course: Intumescent Fire Block for Ventilated Rainscreen Systems

Safety Hazards for Unprotected Ceiling Openings

Final Remarks

As communities across the United States continue to grow and evolve, so too must the strategies used to protect them. Passive fire protection can no longer be a secondary consideration – it is one of key components in the foundation of our future infrastructures.

Here at Tenmat, our Advanced Intumescent Solutions and Materials have not only addressed a once-overlooked life safety hazard but have also redefined how unprotected openings are managed in fire-rated assemblies.

By combining innovation, rigorous testing, and practical design adaptability, Tenmat encourages architects, builders, and building code officials to meet today’s safety standards without compromising on design or functionality.

As we look forward to the future, Tenmat remains committed to advancing passive fire protection technologies and educating industry professionals about relevant building code adoptions – ensuring that every structure, in every community, is built with safety from its core.

Timber, Steel, and Life Safety: Passive Fire Protection in Modern Construction.

Text Passive Fire Protection in Modern Construction overlaid on collage of modern buildings and construction sites.

Learn More About the Standards of Passive Fire Protection in Modern Construction Practices.

Growing popularity for a major state university. Families relocating to the suburbs outside a rapidly developing city. Going demand for energy conservation practices in construction applications. For the past several decades, the United States has been swiftly developing its cities and towns, whether its repurposing outdated building structures, or constructing new facilities. Resulting from the rapid development, a multitude of modern construction practices, such as modular and mass timber construction, has emerged into the construction landscape.

As these practices appear in the construction scene, it is imperative that building code and life safety requirements are enforced and met. With passive fire protection upholding the safety of the lives and properties within our communities, building professionals and code officials need to properly identify the required firestopping solutions for each construction practice. In response, Tenmat has formulated an easy guide, which provides an overview of current construction applications and its associated passive fire protection requirements. Explore below and be proactive in protecting our communities from the disaster of a fire outbreak.

Overview

Testing 1, 2, 3 – Do You Have Life Safety? Advanced Passive Fire Protection in Audio Applications.

Whether you are installing in-ceiling loudspeakers in a newly renovated home cinema or mounting in-ceiling intercoms in new construction healthcare facilities, it is crucial that a high level of life safety is maintained. When these ceiling openings are left unprotected, flames, smoke, and heat are able to travel at an increased rate – jeopardizing the lives and property of these infrastructures. In response, passive fire protection solutions, such as Tenmat’s Fire Rated Enclosures, are designed to reinforce the integrity of the ceiling/floor assembly – causing the fire to be contained and allowing for additional evacuation time for occupants.

A blend of sound isolation, easy installation, and passive fire protection, TENMAT created the FF109-FRSC, a one-hour fire rated speaker cover. The FF109-FRSC 1 Hour Fire Rated Speaker is a dome-shaped intumescent enclosure which has been specifically designed to help maintain the integrity of fire-resistance rated ceiling/floor assemblies for one hour when penetrated by in-ceiling speakers. In addition, the sound absorbing properties of the propitiatory intumescent material enhance the acoustic performance of the speaker’s housing – allowing for a level of sound isolation.
If you want to learn more about the additional forms of passive fire protection in audio applications, please visit Audio Sector Page.

Ctrl+Alt+Delete Unsafe Facilities: Passive Fire Protection in Data Centers.

In the Digital Age, power-storage and data centers play a pivotal role in the storage, management, and processing of extensive digital information and computer systems. These facilities boast a sophisticated design, incorporating multiple storage devices, solid-state drives, and optical storage to cater to diverse and high-level client demands.

Given the substantial volume of through-penetration applications in these facilities, involving various electrical cables and wires, Tenmat has developed several UL Classified firestopping solutions to meet these specific demands. The FF160 Fire Protection Plug, a two-hour through-penetration firestop system, can be retrofitted within power and control cables, telecommunications cables, and optical fiber cables through solid floors or systems. UL Classified for a maximum of 60% cable fills in openings up to 5” diameter in concrete, this solution is easily customizable, making it ideal for power-generating energy stations. Additionally, our FF260 Fire Protection Block, a preformed, intumescent firestop block, is formulated to seal penetrations with cables, cable trays, cable bundles, metal pipes, and mixed penetrations, ensuring flame spread and smoke are halted for 120 minutes.

To gain additional knowledge about implementing the correct forms of passive fire protection into date centers, please visit Data Center Sector Page.

Educating Building Professionals About Advanced Firestopping Solutions in Educational Institutions.

Educational buildings, such as elementary and high schools (K12), university lecture halls, and vocational schools, are the starting grounds for the development of our current and future generations. One of the primary and most profound significances of passive fire protection is its capacity to save lives. In the unfortunate event of a fire outbreak, passive fire protection measures, such as fire-resistant materials, doors, and enclosures, act as a barrier, containing the spread of flames and smoke. This containment provides vital time for evacuation procedures to take place, ensuring the safety of students and staff. It is imperative to remember that in the chaotic atmosphere of a fire, seconds can make a crucial difference.

With T-Bar ceilings being fairly normalized in educational facilities, it is essential to develop a firestopping solution, which accommodates this life safety hazard. In line with the industry’s norm of suspended “T-Bar” ceilings, Tenmat engineered the FF130 – 2’ x 2’ and FF130 – 2’x4’ – a UL one-hour, fire-rated enclosure designed for troffer luminaires. With its ability to cater to any luminaire, regardless of any model or/and manufacturer, the FF130 – 2’ x 2’ and 2’ x 4’ allows architects and developers to choose their preferred lighting choice. Additionally, the flexible and lightweight nature of these covers allows for installation quickly and easily, significantly reducing labor costs compared to dry-walled box constructions.

Further educate yourself about the role passive fire protection plays in educational buildings by exploring the following link: Education Sector Page.

Creating the Equilibrium: Passive Fire Protection and Energy Conservation Solutions for Façade Systems.

In modern construction practices, the incorporation of external cladding and ventilated rainscreen systems have skyrocketed, serving as a dual purpose to enhancing a building’s aesthetics and providing effective protection against the elements. However, this innovative approach often leads to the creation of a cavity or void between the cladding and the building structure, a space crucial for ventilation and improved energy efficiency.

While this design strategy brings about notable advantages in terms of energy conservation and thermal performance, it also introduces a significant life safety challenge that demands careful consideration. The resulting void functions as an open chimney, posing a serious threat to the building’s structural integrity and the safety of its occupants. In the event of a fire this void becomes a conduit, allowing flames to spread rapidly both vertically and horizontally throughout the building.

In response to the massive life safety risks associated with this application, building codes, such as the 2022 NYC Building Code, has taken a proactive stance by identifying the challenges posed by concealed draft openings, both in vertical and horizontal orientations, within structures constructed using both combustible and noncombustible materials.
Tenmat’s FF102/50 Fire Blocks for rain screen systems are highly expansive intumescent fire blocks offering industry leading performance as Ventilated Cavity Fire Barriers / ‘Open State’ Cavity Fire Barriers and Façade Fire Block. The products have undergone extensive fire testing, including NFPA285, and are suitable for use within many construction types, enabling the versatile system to be specified with confidence and provide the installer with a simple, time saving and site friendly solution.

Expand your knowledge about the building code requirements and available solutions for façade systems by visiting Facades Sector Page.

A Band-Aid Won’t Fix the Aftermath: Implementing Passive Fire Protection in Healthcare Facilities.

Healthcare facilities play a vital role in our communities, serving as essential hubs for medical care, healing, and wellness. These facilities often cater to individuals who may have limited mobility, cognitive impairments, or other medical conditions that hinder their ability to respond quickly to a fire outbreak. Passive fire protection acts as a critical line of defense by compartmentalizing fires and preventing the rapid spread of flames, heat, and smoke. This containment allows for more time for evacuations, reduces the risk of smoke inhalation, and provides a safer environment for both residents and healthcare staff.

With a large-scale sanitary drainage and electrical wiring system within a healthcare facility, through-penetration is one of the key openings for flames and smoke, in the unfortunate event of a fire outbreak. As a result, Tenmat offers a full line of fire-rate solutions, designed for the small, irregular openings of through-penetration applications. Tenmat’s UL-Listed FF160 Fire Protection Plug is a flexible and lightweight material – ideal for retrofitting installation, as well as new construction of power and control cables, telecommunication cables, and optical fiber cables through sold floors or ceiling systems. For even smaller, irregular openings, Tenmat’s FF360 Fire Protection Foam can fire-rate irregular, hard-to-access, and large penetrations fast and effectively.

To broaden your understanding about the correct forms of passive fire protection required in healthcare facilities, please visit Healthcare Sector Page.

Shopping for Life Safety? Discover Various Forms of Passive Fire Protection in Hospitality Structures.

From luxury, all-inclusive resorts to your local shopping mall, the significance of maintaining high levels of life safety is crucial. With large volumes of people underneath a single structure, the outbreak of a fire possesses the potential to be catastrophic; therefore, implementing various forms of passive fire protection is essential.

Passive fire protection systems, such as TENMAT’s intumescent materials and solutions, serve as the first line of defense by containing fires, allowing more time for evacuation, and minimizing property damage. This not only protects the lives of guests and staff, but also helps preserve the reputation and financial stability of the hospitality industry. TENMAT offers a wide range of pre-designed solutions to reinforce the compromised integrity of fire-resistance rated ceiling assemblies in hospitality and retail applications.

With the affordability and design freedom of LED downlights, hospitality structures have grown to include these type of lighting fixtures in renovations and new construction of this form of application. TENMAT’s 109-200 and FF109-250s are designed to accommodate the future of lighting – LED downlights and with this solution’s retrofitting capabilities, it accommodates the bustling environments of hospitality and retail environments.

To discover more about the appropriate passive fire protection in hospitality structures, please visit Hospitality Sector Page.

The Age of Industrialization and Life Safety: Implementing Firestopping Technology in Industrial and Commercial Applications.

Whether you are developing a state-of-the-art manufacturing facility for a growing industry leader, or building additional warehouses for a consumer good giant, the importance of protecting its occupants and property is critical. In the unfortunate event of a fire, the lives of the structure’s employees and the physical assets of the facility are in danger of being consumed by smoke and flames. With the implementation of passive fire protection, it provides additional time for building occupants to evacuate, and an increased response time for first responders to extinguish the fire outbreak.

Many of these applications have irregular, hard-to-access, and/or small penetrations, which poses a threat when an outbreak of a fire occurs. These small, irregular openings allow for the flames, heat, and smoke to travel faster within a building, causing the number of lives and costly property damage to significantly increase. In response, Tenmat has formulated a line of pre-made solutions that cater to these irregular, hard-to-access openings.

Tenmat offers a wide range of pre-designed solutions to reinforce the compromised integrity of fire-resistance rated drywall or concrete wall and/or ceiling assemblies in industrial and commercial applications. Whether you are trying to fire-rate power and control cables, telecommunication cables, optical fiber cables, cable trays, cable bundles, metal pipes, or/and mixed penetrations, Tenmat offers a readily available solution.

To explore further about advanced passive fire protection for industrial and commercial applications, please visit Commercial Sector Page.

Master the Trade of Mass Timber and Passive Fire Protection Technology.

In recent years, the push for a smaller carbon footprint and faster lead times in construction practices resulted in the development of mass timber. Mass timber construction is built using a category of engineered wood products typically made of large, solid wood panels, columns or beams often manufactured off-site for load-bearing wall, floor, and roof construction. It offers sustainability, design flexibility, efficiency, structural performance, and myriad other advantages position it as a frontrunner in the movement towards more responsible and eco-conscious building practices.

For joint and gap sealing applications in mass timber, cross-laminated timber (CLT), and glulam, Tenmat has developed a line of state-of-the-art intumescent materials and solutions, each designed with the capability to be versatile in various applications. Tenmat’s FIREFLY 107 is an exceptionally powerful intumescent which combines fast reaction with high expansion and pressure generation – producing a solid char of good integrity. With its composition, the FF107 is applicable in construction joints and gaps. If the application requires a highly flexible firestopping material, Tenmat’s Firefly 104E is the optimal building block for this function. Its flexible nature allows for its ability to be applied into door and glazing seals, door hardware and ironmongery protection, damper seals, gap sealing or a variety of gasketing applications.

To gain additional knowledge about implementing the correct forms of passive fire protection into mass timber structures, please visit Mass Timber Sector Page.

Be The Role Model in Off-Site Construction: Explore the Demand for Passive Fire Protection in Modular Construction Practices.

Over the past several years, there has been a sharp increase in demand for more effective and efficient building processes within the construction industry. This heightened demand primarily stems from the limitations associated with traditional construction practices, including issues related to safety, construction quality, and project timelines. The answer to this problem is modular or off-site construction.

Modular, or off-site, construction practices have an assortment of benefits, compared to traditional construction practices; however, the demand for passive fire protection is equivalent to the demands in traditional construction practices. By building in passive fire protection at the point of manufacture, off-site structures offer builders a vast range of benefits making final construction an easier task.

From edge protection to through penetration, Tenmat offers “no build” UL fire-tested solutions, which have the ability to be installed in a matter of seconds and the flexibility to cater to the most difficult openings with no additional assembly or tools. Tenmat’s Firefly FF107 is an exceptionally powerful intumescent which combines fast reaction with high expansion and pressure generation. This material allows for an additional thickness for construction joint and gap sealing applications where the high expansion characteristics lead to economical material usage. If you are seeking to fire rate smaller wall penetrations, Tenmat offers a fire protection foam, the FF360. This sealant is recommended for blank openings, metal pipes, conduits, wires, and mixed penetrations in solid floors and ceilings.

To become an expert about passive fire protection standards in modular construction, please visit Modular Sector Page.

Multiply the Use of Passive Fire Protection in Multi-Family Complexes.

Conforming with the standards of implementing energy efficiency and accelerated construction practices, Type V-A construction has taken root in our modern, new communities. With its wood composition, these buildings provide excellent design flexibility, allowing for diverse architectural styles and layouts, making this practice optimal for residents, developers, and architects. Common applications of Type V-A construction include apartment complexes and condominiums. These structures house a multitude of families and individuals, which heightens the level of importance of installing passive fire protection solutions. By containing the smoke and flames, slowing their spread, and providing a longer evacuation period, passive fire protection not only reduces the loss of life but also ensures the integrity of the multi-family structure.

One of the main causes of the rapid spread of flames, smoke, and heat is the unprotected ceiling openings, caused by recessed can lights, LED downlights, and in-ceiling loudspeakers. When penetrating a fire-resistance rated ceiling with a lighting or speaker fixture, it compromises the integrity of a fire-resistance ceiling/floor assembly. Once a fire begins, the composition of the in-ceiling fixture melts within 15 minutes, allowing for heat, flames, and smoke to travel at a swift pace throughout the structure. In response, Tenmat has created a line of fire-rated enclosures, designed to fit over standard recessed can lights, oversized can lights, LED downlights, and in-ceiling speakers.

To learn more about applicable passive fire protection solutions and materials for multi-family structures, please visit Multi-Family Sector Page.

Wrapping It Up

To conclude, it is essential to keep our current and future communities safe from the unfortunate event of a fire outbreak. Here at Tenmat, we offer a full product range of firestopping solutions and materials, ranging from recessed can lights, in-ceiling loudspeakers, through-penetration systems, and so much more. To learn more about our full catalogue, please visit Application Overview or contact one of our specialists at +1-800-821-3436.