Low Viscosity System for Tough Parts & Structures
PT2712 is a low viscosity epoxy system designed for the fabrication of parts and structures by the resin infusion method. This system flows extremely well, and produces dense, void-free laminates routinely. The cured properties of this system are very high, so it produces items with good strength and toughness with excellent long-term stability.
Three hardeners are available for use with this resin, which provide a range of working times. The hardeners have gel times of approximately 1 hour, 2 hours and 3 hours, so, by proper selection between the three, it is possible to easily infuse any size structure. The three hardeners are identical except for reaction time, so no matter which hardener is chosen, the user can expect the same high performance properties. The mixed viscosity with all three hardeners is just over 300 centipoise, so the the material flows very well, even in thin walled areas. It penetrates heavy fabric sections and wets out quickly for further easy of production.
|PT2712-A||Part B||Part B2||Part B3||ASTM Method|
|Viscosity, centipoise||1000 cps||25 cps||25 cps||60 cps||D2392|
|Specific Gravity, gms./cc||1.10||.97||.97||.99||D1475|
|Mix Ratio, Weight/Volume||100 : 22 by weight|
4 : 1 by volume
|Pot Life, 4 fl. oz. Mass @ 77F||~1 hour |
HANDLING & CURING
The four hardeners for PT2712 will cure completely at room temperature, if required. In the case of smaller parts and structures made with the faster hardeners B and B3, the material will gel hard overnight at normal ambient temperatures. At this point in the cure, the bag and ancillary infusion materials can be removed from the laminate and the part can be sanded or trimmed as required. Full cure with these 2 hardeners will be achieved in 4 to 6 days at normal room temperature. Warmer summer temperatures will shorten this cure and a cooler environment will increase cure time.
When using Part B1 or B2, for larger structures, longer time must be given at all cure stages to allow proper curing with this slower reacting hardener. Well over 24 hours at room temperature is required before the structure can be removed and sanded, with the exact time depending upon laminate size and shop environment. Test with standard laminate samples amde with Part B2 hardener have shown that full cured properties are reached in 10 days at 75°F for example.
In all instances, a heat cure will shorten the curing time of PT2712. In situations where the laminate can be placed in an oven after a room temperature gel, curing times of 8 to 10 hours at 180°F or 14 to 18 hours at 150°F will provide 90% of full cured properties. When an oven has not been available or practical, due to the size of the structure, for example, structures have been tented with plastic or tarps and then lights or space heaters have been used as the heat source for curing. Also, plywood boxes have been fabricated to enclose the structure for curing in this manner. Experimentation will determine the best method to use for the individual structure and shop conditions.
|Gallon Kit ||Pail Kit ||Drum Kit |
|PT2712 Part A || 9 lb.||36 lb. ||500 lb. |
|PT2712 Part B, B1, B2 or B3 || 2 lb.|| 8 lb.||111 lb. (3 @ 37 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
| PT2712 A / B*1|| ASTM Method|
| Mix Ratio (By Weight / Volume)|| 100 : 22 By Weight (All 4 Hardeners)|
4 : 1 By Volume (All 4 Hardeners)
| Pot Life, @ 77°F|| Part B – 70 min.; Part B1 – 122 min.;|
Part B2 – 175 min.; Part B3 – 40 min.
|Color|| Light Amber||Visual|
| Mixed Viscosity, centipoise|| 320 cps.|| D2393|
| Cured Hardness, Shore D|| 86 Shore D||D2240|
| Specific Gravity, grams, cc||1.08||D1475|
| Tensile Strength, psi (Cast Bar)|| 10,960 psi||D638|
| Elongation, % at Yield (Cast Bar)|| 6.3 %|| D638|
| Tensile Modulus, psi (Cast Bar)|| 486,610 psi||D638|
| Tensile Strength, psi (Laminate*2)|| 41,415 psi||D638|
| Elongation,% at Break (Laminate*2)||2.54%||D638|
| Tensile Modulus, psi (Laminate*2)|| 2,792,062 psi||D638|
| Flexural Strength, psi (Cast Bar)|| 18,942 psi|| D790|
| Flexural Modulus, psi (Cast Bar)|| 528,460 psi|| D790|
| Flexural Strength, psi (Laminate*2)|| 54,683 psi||D790|
| Flexural Modulus, psi (Laminate*2)|| 2,876,867 psi|| D790|
| Compressive Strength, psi|| 15,930 psi||D695|
| Compressive Modulus, psi|| 491,503 psi||D695|
| Izod Impact Strength, ft-lbs/in Method A|| 1.093 ||D256|
| Glass Transition Temperature, DMA |
TG Onset (E’) / Tg Peak
| 161°F / 204°F||D4065|
| Thermal Coefficient of Expansion,|
Range 40°C to 60°C
| 5.42 x 10-5 in./in. F||D696|
*1: The 4 Hardeners for PT2712 are Functionally Identical Except for Reaction Time, so Cured Properties are The Same for All.
*2: Tensile and Flexural Properties were Determined with a 1/8 inch Laminate Style 7500 Boat & Tooling Fiberglass Cloth, Resin Content of 40%.
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.