High Temperature Epoxy Laminating System
PT2876 A/B is an unfilled amber epoxy laminating system designed for the highest service temperature applications. The extended working time of PT2876 A/B allows enough time for vacuum-bagging, yet will set well enough at room temperature to allow the laminate to be demolded from the pattern for post curing. Long tool life is obtainable for autoclave service temperatures up to 450°F, if proper fabrication techniques are used during construction. This system will easily wet-out carbon and fiberglass tooling fabrics. It can also be used for making high-temperature service composite parts.
|PT2876 Part A||PT2876 Part B||ASTM Method|
|Viscosity, @ 77 F, centipoise||3,200 cps||3,000 cps||D2392|
|Specific Gravity, gms./cc||1.17||.98||D1475|
|Mix Ratio||100 A : 46 B, By Weight||PTM&W|
|Pot Life, 4 fl.oz. Mass @ 77 F||4.5 – 5 hours||D2471|
HANDLING & CURING
PT2876 A/B may be demolded from the pattern after a minimum of 24 hours at ≥75°F. Care should be taken during removal, as the system may retain some brittleness at this stage. To avoid this brittleness, allow the resin to gel hard, attach backup structure, then place the laminate in a cold oven and heat to 100-200°F for a minimum of 12 hours. Allow to cool to RT and demold. Post cure the tool by placing into a cold oven and raise to 150°F for 6 hours, raise to 450°F in 100°F increments, dwelling for 4 hours at each stop. Turn off oven and allow it to cool to RT.
PT2876 can develop considerable heat buildup in larger masses, so it is advisable to mix smaller quantities at a time to minimize this condition. If larger batches are mixed at once, divide the mixed batch among several workers to again minimize the heat buildup. Avoid leaving mixed quantities of material sitting in a container after a job is finishes, as over time, the resulting exotherm can cause the material to boil and give off noxious, potentially irritating fumes.
|Gallon Kit||Pail Kit||Drum Kit|
|PT2876 Part A||8.75 lb.||43 lb.||435 lb.|
|PT2876 Part B||4 lb.||20 lb.||200 lb.|
|Kit||12.75 lb.||63 lb.||635 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.
TYPICAL MECHANICAL PROPERTIES
|PT25876 A/B||ASTM Method|
|Mix Ratio, by Weight||100 A : 46 B||PTM&W|
|Mixed Viscosity, @77F, centipoise||2,700 cps||D2393|
|Pot Life, 4 fl.oz. Mass, @77F||4.5 – 5 hours||D2471|
|Cured Hardness, Shore D||90 Shore D||D2240|
|Specific Gravity, grams, cc||1.10||D1475|
(lb. per cu Inch, lb. per gallon)
|0.0398 / 9.2||D792|
|Specific Volume, cu. in./lb.||25.1||D792|
Style 7500 Glass|
38% Resin Content
Style 7781 Glass|
35% Resin Content
45 % Resin Content
|Elongation at Break, %||1.060% Yield||1.59% Break||1.38% Break||1.05% Break||D638|
|Tensile Modulus, psi||
|Flexural Strength, psi||
|Compressive Strength, psi||
|Compressive Modulus, psi||
|Glass Transistion Temp, DMA: Tg, E’ (onset), Tg, Peak||
Onset: 204C (399F)|
Peak: 236C (457F)
SAFETY & HANDLING
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.