PT7660 & PT7665 Shore D-60 Hard Urethane Elastomers


The two Shore D-60 urethane systems described here are exceptionally tough, hard elastomers that have cured characteristics which make them well suited for some very demanding industrial uses. Both of these systems have very high tensile and tear strengths and excellent elongation, so tooling or parts made with these materials are very durable. They have very good resistance to abrasion, so they are ideal for the production of foundry tools and patterns. These materials work hard and solve problems!
PT7660 is an amber system with a lower viscosity and a fast cure time at room temperature. The almost 30 minute working time combined with its low mixed viscosity allows PT7660 to be used in both open casts and closed molds. Its faster curing time allows quicker production of multiple-piece patterns and smaller castings. 
PT7665 is a tan colored system with a longer pot life and slower cure and is ideal for larger castings, which will exhibit very low cured shrinkage. PT7665 can be used to produce solid mass cast patterns, saving time over surface casting, that is necessary with other, faster curing systems to prevent excessive shrinkage. PT7665’s outstanding abrasion resistance makes it perfect for demanding foundry patterns. Its extreme toughness allows it to produce urethane tooling not possible with other materials of this hardness. It has given many years of excellent service in the most difficult tooling situations.
PT7660 and PT7665 can be considered very low hazard potential products, as they do not contain any toxic or regulated raw materials in their makeup. They do not contain methylene dianiline (MDA), or other potentially harmful aniline derivatives, nor do they contain MBOCA or TDI, and they do not invclude any hazardous or potentially regulated diluents.

 Shore D-60 System Shore D-60 System

 PT7660 APT7660 BPT7665 APT7665 BASTM Method
2,800 cps
180 cps6,000 cps
Thin PasteD23932
Specific Gravity, gms./cc
Mix Ratio, by Weight
100 : 44
100 : 60PTM&W
Pot Life, 4 fl oz Mass @ 77°F
26 min.
112 min.D2471


Generally, with polyurethane elastomers, full properties are developed in 7 days at room temperature (75°F). Temperatures below 75°F will lengthen the cure time, and if the ambient temperature is below 60°F, additional heat may be necessary for proper cure. Elevated temperatures will accelerate the cure of urethanes, but care must be taken if a higher temperature is used to cure the material. Generally, the higher the curing temperature, the greater the final cured shrinkage. When heat curing for more rapid processing, to best control shrinkage, the casting should be allowed to set for 12 to 18 hours at room temperature before an oven post cure. A typical accelerated curing cycle, therefore, would be: Allow to gel on the pattern for 12 to 18 hours at room temperature (70°F to 80°F), then post cure for a minimum of 8 hours at 150°F to 165°F and allow to cool before demolding.


Quart Kit Gallon KitPail Kit
PT7660 A2 lb.
8 lb.
40 lb.
PT7660 B
.9 lb.
3.75 lb.17.75 lb.
Kit2.9 lb.
11.75 lb.
57.75 lb.
PT7665 A  8 lb.40 lb.
PT7665 B 4.9 lb.24 lb.
Kit 12.9 lb.64 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.

 PT7660 A/B
PT7665 A/BASTM Method
Mix Ratio, by Weight
100 : 44
100 : 60PTM&W
Mixed Viscosity, @77°F, centipoise
2600 cps
5000 cpsD2393
Working Time, 4 fl. oz. Mass @ 77°F
26 min.
112 min.D2471
Cured Hardness, Shore D
60 Shore D ± 5
60 Shore D ± 5D2240
Shrinkage, in/in, mold #1, Vol: .053 Gal
                           mold #3, Vol: 1.23 Gal
0.001 in/in
Specific Gravity, grams, cc
Density,  lb./cu in,
0.0383 0.0396D792
Specific Volume,  cu. in./lb.
Tensile Strength, psi 
6014 psi
5005 psiD638
Elongation at Break, %
646 %
554 %D638
Tensile Modulus @ 100% Elongation1896 psi
1765 psiD412
Tensile Modulus @ 200% Elongation2457 psi2363 psiD412
Tensile Modulus @ 400% Elongation4071 psi3850 psiD412
Tear Strength, Die C, pli 565 pli 661 pliD412
Compression Set, Method B
88 % 56 %D395
Bashore Rebound
48 % 53 %D2632
Taber Abrasion, H18 Wheel, 1000 grams, 1000 cycles, mg loss13 milligrams
19.1 milligramsD1044


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.