PT2620 High Temperature Epoxy Laminating Resin
DESCRIPTION
PT2620
is a gray, filled intermediate high temperature laminating resin
intended for use in fabricating tools and fixtures for a variety of
industrial applications. PT2620 is filled to provide lower cured
shrinkage and to allow easy laminating with minimum drain or runoff on
contoured or vertical surfaces. PT2620 handles very easily. The slightly
thicker mixed viscosity penetrates the reinforcing fabric quite well
and holds it in place as subsequent layers are applied. Tools made with
PT2620 are tough, with high tensile and flexural strength, and excellent
heat resistance.
Three high temperature hardeners that provide similar cured properties
are available for use with PT2620 resin. These hardeners differ in the
pot life/gel time that they provide, enabling the user to fabricate
small to large tools with adequate working time by choosing between the
three. All three of the Part B hardeners will gel hard at room
temperature for subsequent oven post curing off the pattern. The ability
to perform an unsupported post cure off the pattern has significant
advantages. With this capability, it is possible to use low temperature
pattern materials such as wood or plaster, since they will not have to
be put into the oven for post cure. The PT2620 systems have found good
acceptance in such applications as vacuum form tools, foam molds, layup
molds, and a variety of other uses where repetitive heating and cooling
cycles are involved. There are no restricted or regulated raw materials
used in these high temperature products. PT2620 Part A does not contain
vinylcyclohexane diepoxide (VCHD), or other hazardous or potentially
restricted diluents. The PT2620 Part B hardeners do not contain
methylene dianiline (MDA) or other potentially harmful aniline
derivatives. They are non-staining, and will not crystallize in normal
shipping and storage conditions.
PRODUCT SPECIFICATIONS
| PT2620 A | PT2620 B | PT2620 B1 | PT2620 B2 | ASTM Method | |
| Color | Gray | Amber | Amber | Amber | Visual |
| Viscosity | 5400 cps | 1700 cps | 1300 cps | 1000 cps | D2392 |
| Specific Gravity, gms./cc | 1.35 | 1.08 | 1.10 | 1.0 | D1475 |
| Mix Ratio, by Weight | — | 100 : 13.5 | 100 : 11 | 100 : 15 | PTM&W |
| Pot Life, 4 fl oz Mass @ 77°F | — | 40 – 50 min. | 75 – 90 min. | 2.5 – 3 hr. | D2471 |
HANDLING & CURING
When using PT2620 Part B or Part B1, the system will gel hard in 18 to
24 hours at 77°F. In lower temperature service, non-critical
applications, the system can usually achieve its full cure in service.
However, for maximum stability, an oven post cure is recommended, and is
mandatory in applications where continuous service temperature is over
250°F.
When using the Part B2 hardener, under normal conditions the system will
gel to a hard demoldable state in 24 to 36 hours. In colder shop
environments, or unusual conditions, the user should check closely to
insure that the resin has fully gelled before the tool is post cured. In
very cold environments, it may be necessary to give the tool a slight
amount of heat cure before it is removed from the pattern to avoid
distortion due to insufficient cure. A few hours at 100°F to 150°F,
depending upon what temperature the pattern material can withstand,
will harden the tool to the point where it can be given an unsupported
post cure. The lower the curing temperature that is used, the longer the
curing time should be.
PACKAGING WEIGHTS
| Quart Kit | Gallon Kit | Pail Kit | Drum Kit | |
| PT2620 A | 2.25 lb. | 9 lb. | 45 lb. | 470 lb. |
| PT2620 B | — | 1.2 lb. | 6 lb. | 64 lb. |
| PT2620 B1 | — | 1 lb. | 5 lb. | 52 lb. |
| PT2620 B2 | .34 lb. | 1.35 lb. | 6.75 lb. | 72 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
| PT2620 A/B/B1 | PT4770 A/B2 | ASTM Method | |
| Color | Gray | Gray | Visual |
| Mixed Viscosity, @77°F, centipoise | 4000 – 4500 cps | 4100 cps | D2393 |
| Cured Hardness, Shore D | 89 Shore D | 90 Shore D | D2240 |
| Specific Gravity, grams, cc | 1.29 | 1.27 | D1475 |
| Density, lb./cu. in. | .0465 | .0459 | D792 |
| Specific Volume, cu. in./lb. | 21.5 | 21.8 | D792 |
| Tensile Strength, psi | 29,250 psi | 28,890 psi | D638 |
| Elongation at Break, % | 1.37 % | 1.55 % | D638 |
| Compressive Strength, psi | 15,450 psi | 16,050 psi | D395 |
| Glass Transistion Temperature, DMA: | 270°F | 285°F | D3386 |
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.