Intumescent Coatings
CAFCO® SprayFilm® WB 3

CAFCO® SprayFilm® WB 3 Intumescent Fire Resistive Material (IFRM) is a world leading water-based, intumescent coating designed for the fire protection of interior structural steel.

SprayFilm WB 3 introduced new levels of coverage and competitive thickness requirements in the industry. The technological improvements introduced by SprayFilm WB 3 also allowed for easier application and a more environmentally friendly product.

CAFCO SprayFilm WB 3 provides architects the ability to design using steel that can be decorative and aesthetically pleasing. It can be top coated to match its surroundings and allows steel to be left exposed to view while providing the required fire resistance rating.

Available in trowel grade, CAFCO SprayFilm WB 3 TG can be used for hard to reach areas or for repair applications.



  • Water-Based Intumescent coating with low VOC’s.
  • The first UL-Classified Intumescent Coating with a Protected Floor Assembly rating.
  • Provides up to 2-hour fire resistance ratings in accordance with BS476: Parts 20 & 21, and 4-hours in accordance with ANSI/ UL 263, ASTM E119, CAN /ULC-S101.
  • Contains no solvents or harmful compounds.
  • Superior performance proven by wide range of testing.
  • Durable, smooth architectural finish.
  • Quick, easy application and clean up.
  • Can be finished with a wide variety of topcoat types and colors.

Product Uses

Wherever an aesthetically pleasing extremely durable finish is desired on exposed steel beams and columns utilized in a variety of open space locations including corporate headquarters, convention halls, atriums, retail facilities, hospitals, airports, rail and bus depots.

The first UL Classified Intumescent Fire Resistive Material (IFRM) with a “Protected” Floor Assembly rating (UL Design No. D601). This allows protected floor assemblies to remain exposed with a pleasant, paint-like finish.

Fire Tests & Approvals

In order to meet the performance and durability criteria set forth by the American Institute of Architects (AIA) and other major industry specifying organizations, CAFCO® SprayFilm® WB 3 has undergone the most rigorous testing in accordance with the world’s most demanding safety protocols.

UL 263, ASTM E119 - UL-263

Cellulosic – ANSI/UL263 (ASTM E119) – Fire Tests of Building Construction and Materials

This cellulosic fire test is traditionally used to evaluate materials for use in the protection of modern day commercial structures. This test reaches 1000°F (537°C) after 5 minutes and gradually reaches a temperature of 2000°F (1093°C) after a period of up to 4 hours.

CAFCO SprayFilm WB 3 is classified by Underwriters Laboratories for up to 4 hours protection in accordance with ANSI/ UL263 and is listed within various UL Designs. CAFCO SprayFilm WB 3 (ISOLATEK Type WB 3 outside of the Americas) has also been evaluated in accordance with BS476: Part 21: 1987 for periods up to 2 hours on beams and columns which are listed within Warrington assessment reports.

UL Logo

UL Classification Mark

The UL Classification Mark indicates compliance with global requirements as it relates to a specific risk or casualty. With the Classification service, UL determines that a manufacturer has demonstrated the ability to produce a product complying with UL’s requirements with respect to one or more of the following:

  • Specific risk, e.g., casualty, fire, etc.
  • Performance under specific conditions
  • Compliance with regulatory codes
  • Compliance with specific standards such as international standards
  • Other condition, as determined by UL

All of the products carrying a UL Classification Mark are covered by UL’s Follow-Up Services program to verify that products carrying the UL Classification Mark continue to be manufactured in compliance with UL’s safety requirements.

Fire Tests of Building Construction and Materials

Cellulosic – BS476: Part 20: 1987 – Method of Determination of the fire resistance of elements construction & EN 1363-1 – Fire Resistance Tests, General Requirements:

This cellulosic fire test is traditionally used to evaluate materials for use in the protection of modern day commercial structures. This test reaches 1069°F (576°C) after 5 minutes and gradually reaches a temperature of 2107°F (1153°C) after a period of up to 4 hours.

CAFCO SprayFilm WB 3 has been evaluated in accordance with BS476: Parts 20-21: 1987 & EN 1363-2 for periods up to 4 hours on beams and columns which is listed within a Warrington assessment report.

Three Bar Overpressure Blast Explosion Testing - Explosion/Blast Testing

Three Bar Overpressure Blast Explosion Testing with Subsequent Hydrocarbon Fire Testing

To determine the ability of fire protection materials to withstand a blast or explosion, a series of blast overpressure tests, followed by a hydrocarbon fire test is essential in order to determine the durability of the material. These tests are carried out by means of applying the fire resistive material to steel members and subjecting them to blast overpressure testing directly followed by a hydrocarbon fire test.

Isolatek International subjected CAFCO SprayFilm WB 3 to this test at Advantica Spadeadam Test Facility in the UK. The tests were independently witnessed by Lloyd’s Register of Shipping. Three separate tests were conducted, peaking at 3.11 atmospheres (6580 psf). The specimens survived without any damage. After the tests were complete, the members successfully were subjected to hydrocarbon fire testing.


New York City Materials and Equipment Acceptance (MEA)

An MEA Number is the number assigned to a product that has been approved for use in New York City by the MEA Division. CAFCO SprayFilm WB 3 has been reviewed and MEA numbers have been assigned.

The MEA division regulates “certain materials and equipment (that) require Department of Buildings acceptance.” These manufactured items affect public safety, health and welfare (including structural stability and fire safety) and are usually a permanent part of a building.

Evaluation Service Report

Underwriters Laboratories (UL) has conducted a technical evaluation on CAFCO SprayFilm WB 3. The result of the evaluation process assures that the CAFCO SprayFilm WB 3 is in compliance with the International Building Code (IBC).

Major Specification and Approval Compliance

CAFCO SprayFilm WB 3 complies with the requirements of the following specifications:

  • MasterSpec®, Section 078123 APPLIED FIREPROOFING (AIA)
  • MasterFormat® 2014, Section 07 81 00 Applied Fireproofing (CSC,CSI)
  • Unified Facilities Guide Specification, UFGS 07 81 00 Spray-Applied Fireproofing (USACE, NAVFAC, AFCEC, NASA)
  • Master Construction Specifications, Number 07 81 00 Applied Fireproofing (VA)
  • Code of Federal Regulations, Title 40 Protection of the Environment (EPA)
  • PBS-P100, Facilities Standards for the Public Buildings Services (GSA)

ASTM Physical Performance Standards  Test Performance*
Intumescent Fire Resistive Materials (IFRM’s)
Physical Property ASTM Standard CAFCO® SprayFilm® WB 3
Surface Burning Characteristics ASTM E84 Flame Spread – 0
Smoke Developed – 20
Cohesion / Adhesion(Bond Strength) ASTM D4541 485 psi (3344 kPa)
Durometer Hardness ASTM D2240 67 Shore D
Impact Resistance ASTM D2794 160 inch-lb (18 Nm) @ 2mm
Abrasion Resistance ASTM D4060 0.1105 g/1000 cycles

*Based on independent laboratory tests under controlled conditions.