PT4450 is a black, iron filled epoxy casting resin designed to provide tough, durable castings of various sizes and thicknesses. As PT4450 is relatively low in viscosity, it mixes and pours quite easily, and reproduces detail on the model without trapping air or leaving voids. This resin has been designed to be non-settling in transit and storage, so it is easy to prepare and mix for pouring. Castings made with PT4450 have good compressive strength and toughness for long service life. PT4450 has been used for tracer patterns, hydropress form blocks, foundry patterns, metal forming dies and engineering prototype parts.

 PT4450 Part APT4450 Part B
PT4450 Part B1
ASTM Method
Viscosity, @77F centipoise
56,000 cps
50 cps
850 cps
Specific Gravity, gms./cc
Mix Ratio 100 : 11.5 100 : 24PTM&W
Pot Life, 4 fl. oz. Mass @77F 45 – 50 min.2 – 3 hr.D2471


Both PT4450 hardeners will cure completely at room temperature with no added heat required. Castings made with the PT4450 Part B hardener may be demolded after 18 to 24 hours at 77F, depending upon the size of the casting. Castings made with the PT4450 Part B1 hardener usually require a full 24 hour cure. If a shorter cure time is necessary, the casting may be given an oven post cure after a room temperature gel. If this is desired, check with our technical department for curing guidelines. Heat curing will increase shrinkage.


Gallon Kit
PT4450 Part A13.5 lb.
50 lb.
PT4450 Part B
1.6 lb. 5.75 lb.
PT4450 Part B13.25 lb.
12 lb. (2 @ 6 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.

 PT4450 A/B1*ASTM Method
Mixed Viscosity, @ 77F, centipoise4,500 cpsD2393
Cured Hardness, Shore D88 Shore DD2240
Shrinkage, in./in., Mold #2, Volume: .344 Gal..0001D2566
Density          lb./cu. inch,   lb./gallon.0546, 12.6D792
Specific Volume, cu. in./lb18.3D792
Tensile Strength, psi8,600 psiD638
Flexural Strength, psi12,200 psiD790
Compressive Strength, psi13,500 psiD695

* These properties were developed with PT4450 B1 Hardener, and are typical of PT4450’s performance.


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.