PT2475 Fire Retardant Laminating System


PT2475 is a filled, off-white epoxy laminating system designed for use in constructing fire retardant laminates for parts or reinforcements. PT2475 meets the requirements of the FAR 25.853 Specification.
The cured properties of PT2475 are quite good, and structures fabricated with this system will provide long durable service life. This system has a 1 hour pot life at normal ambient temperatures, which will allow the construction of larger laminated than would be possible with a faster material. The system cures well at room temperature, and the cure can be accelerated with the addition of mild heat if desired.

 PT2475 A
PT2475 B
ASTM Method
8,000 – 8,500 cps
25 cps
Specific Gravity, gms./cc
Mix Ratio, by Weight
100 : 13
Pot Life, 4 fl oz Mass @ 77°F
60 – 65 minutes


PT2475 A/B will cure completely at normal room temperature ( 75°F or higher), and does not require an oven heat cure, although the cure time can be shortened by the addition of heat after a room temperature cure on the pattern. When using this system, 24 hours at room temperature should be allowed before the laminate is removed from the pattern. Longer time on the pattern would be required for very thin laminates. Higher ambient temperatures will shorten these requirements, and conversely, longer cure times will be necessary in colder temperatures. If a faster cure is desired, the laminate can be allowed to cure at room temperature on the pattern for 8 to 12 hours, and then given a heat cure of 2 – 4 hours at 150°F to achieve full cure. Exact times for these cycles will vary with part size, laminate thickness and shop conditions, so it is best to fabricate test coupons to determine optimum cure times.


Gallon Kit
PailDrum Kit
PT2475 A 9 lb.
46 lb.
475 lb.
PT2475 Part B
1.2 lb.
6 lb.
62 lb. (2 pails @ 31 lb. ea.)
PT2475 Part B1
10.2 lb.
52 lb.
437 lb.

Inasmuch as PTM&W Industries, Inc. has no control over the use to which others may put material, it does not guarantee that the same results as those described herein will be obtained. The above data was obtained under laboratory conditions, and to the best of our knowledge is accurate. This information is presented in good faith to assist the user in determining whether our products are suitable for his application. No warranty or representation, however is intended or made, nor is protection from any law or patent to be inferred, and all patent rights are reserved. Before using, user shall determine the suitability of the product for his intended use, and user assumes all risk and liability whatsoever in connection therewith. In no event with PTM&W Industries, Inc. be liable for incidental or consequential damages. Buyer’s sole and exclusive remedy in such instances shall be limited to replacement of the purchase price.

 PT2475 A/B
ASTM Method
Mix Ratio, by Weight
100 : 13
Mixed Viscosity, @ 77°F, centipoise
2100 – 2300 cps
Pot Life, 4 fl. oz. Mass @ 77°F
60 – 65 minutes
Cured Hardness, Shore D
87 Shore D
Specific Gravity, grams, cc
Density, lb./cu. in.  ,  lb./gallon
0.046,  10.3
Specific Volume, cu. in./lb.
Tensile Strength, psi
6,070 psi
Elongtion at Break, %
2.43 %
Tensile Modulus, psi
555,960 psi
Flexural Strength, psi
12,727 psi
Flexural Modulus, psi
607,379 psi
Compressive Strength, psi
13,626 psi
Compressive Modulus, psi
526,053 psi
Izod Impact Strength, Method A, Notched
 .53 ft. lbs./inch of notch D256
Glass Transition Temp., DMA: Tg (Peak)


PTM&W epoxy products are made from raw materials carefully chosen to minimize or even eliminate toxic chemicals, and therefore offer the user high performance products with minimum hazard potential when properly used.  Generally, the PTM&W epoxy resins and hardeners will present no handling problems if users exercise care to protect the skin and eyes, and if good ventilation is provided in the work areas.  However, all epoxy resins and hardeners can be irritating to the skin, and prolonged contact may result in sensitization; and breathing of mist or vapors may cause allergenic respiratory reactions, especially in highly sensitive individuals.  As such, avoid contact with eyes and skin, and avoid breathing vapors.  Wear protective rubber apron, clothing, gloves, face shield or other items are required to prevent contact with the skin.  In case of skin contact, immediately wash with soap and water, followed by a rinse of the area with vinegar, and then a further wash with soap and water.  The vinegar will neutralize the hardener and lessen the chances of long term effects.  Use goggles, a face shield, safety glasses or other items as required to prevent contact with the eyes.  If material gets into the eyes, immediately flush with water for at least 15 minutes and call a physician.  Generally, keep the work area as uncluttered and clean as possible, and clean up any minor spills immediately to prevent accidental skin contact at a later time.  Keep tools clean and properly stored.  Dispose of trash and empty containers properly.  Do not use any of these types of products until Material Safety Data Sheets have been read and understood.