PT4420 High Performance Aluminum Filled Resin


PT4420 is a high performance epoxy casting resin with many excellent qualities which make it perform very well in a variety of demanding tooling applications. PT4420 has a very high aluminum content that provides excellent machinability to the finished castings. Castings made with PT4420 have high compressive strength for heavy loads. The significant aluminum content gives castings very good thermal conductivity. PT4420 has been designed to exhibit a soft filler settling to avoid time-consuming pre-blending that is necessary with hard packed fillers.

Part A
Part B
Part B1
ASTM Method
Viscosity, @77°F, centipoise
200,000 cps
@ 25°C
40,000 cps @ 50°C
50 cps850 cps
Specific Gravity, gms./cc
Mix Ratio
 100 : 8.5
100 : 17
Pot Life, 4 fl. oz. Mass @ 77°F
 50 – 60 mins
2 – 3 hours


Both PT4420 hardeners will cure completely at room temperature with no added heat required. Castings made with the PT4420 Part B hardener may be demolded after 18 to 24 hours at 77 o F, depending upon the size of the casting. Castings made with the PT4420 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
Pail Kit
PT4420 Part A
12 lb.
47 lb.
PT4420 Part B
1 lb.
4 lb.
PT4420 Part B1
2.04 lb.
8 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.

 PT4420 A/B
PT4420 A/B1
ASTM Method
Mix Ratio, By Weight
100 : 8.5
100 : 17
ColorMetallic Gray
Metallic Gray
Mixed Viscosity, @77F, centipoise
80,000 cps
85,000 cps
Pot Life, 4 fl. oz. Mass @ 77F
50 – 60 mins
2 – 3 hrs
Cured Hardness, Shore D 87 Shore D
86 Shore D
Shrinkage, in./in, Mold #2, Vol: .344 gal
Specific Gravity, grams, cc
Density,    lb./cu. in.
Specific Volume,  cu. in./lb. 16.417.3D792
Tensile Strength, psi
9,650 psi
7,900 psi
Flexural Strength, psi
6,400 psi
11,600 psi
Compressive Strength, psi
16,000 pso
24,000 psiD695


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.