PT4045 Medium Viscosity Unfilled Epoxy Resin


PT4045 is an amber, unfilled, general purpose epoxy resin that is suitable for a wide variety of adhesive,
tooling and encapsulating applications. It is an undiluted resin, so it cures with less shrinkage than diluted materials. The medium viscosity is thinned very well by hardeners, for easy handling. Bulk fillers can be added to the resin/hardener mixture to provide a broad range of cured properties for different applications.

PT4045 Part B
(Formerly PH3210)
100 : 30
35 – 40 min
 A very low viscosity hardener that thins the resin quite well for good detail reproduction. Imparts outstanding toughness and impact strength to the cured material. Very aggressive adhesive properties with this hardener, therefore good release techniques are important.
PT4045 Part B1
(Formerly PH3225)
100 : 50
2 hours
General purpose casting hardener with longer pot life for larger castings. Mix ratio can be increased for more flexible cure.
PT4045 Part B2
(Formerly PH3633)
100 : 20
3 – 4 hours
Longer pot life hardener for high temperature applications.

 PT4045-APart B
Part B1
Part B2
ASTM Method
ColorAmber Clear
Light Amber
Dark AmberAmberVisual
Viscosity, centipoise
10-12,000 cps
20 cps
1000 cps
1200 cps
Specific Gravity, gms./cc


All three of the hardeners listed here will gel at room temperature. With hardeners PT4045 Part B and
PT4045 Part B1, no additional oven cure is required for room temperature service applications. Castings with these two hardeners can be put into service after 24 hours at room temperature, typically 77°F. If a faster cure is desired, let the casting gel at room temperature, then oven cure for 2 to 3 hours at 140°F to 165°F.
When using PT4045 Part B2, under normal conditions the system will gel to a hard demoldable state in 24 to 36 hours at 77°F. In colder shop environments, or unusual conditions, the user should check closely to insure that the resin has fully gelled before the casting is post cured. For the best high temperature properties, castings made with hardener PT4045 Part B2 should be given an oven post cure. A typical minimum cure schedule would be:

Initial R.T. Cure
Post Cure Schedule
PT4045 Part B2
Gel at least 24 hr @ 77°F
Post Cure for 3 hrs ea.
@ 150°F,  200°F, 275°F,  and 325°F

Quart KitGallon Kit
PailDrum Kit
PT4045 2.25 lb.
9 lb.
45 lb.
500 lb.
PT4045 Part B
.7 lb.
2.7 lb.
13.5 lb.
PT4045 Part B1 4.5 lb.
22.5 lb.
250 lb.
PT4045 Part B2
1.8 lb.9 lb.
100 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.

 PT4045 Resin with:
ASTM Method
PT4045 Part B
PT4045 Part B1
PT4045 Part B2
Mixed Viscosity, @ 77°F, centipoise
600 cps
2000 cps
7800 cps
Cured Hardness, Shore D
80 Shore D
84 Shore D
84 Shore D
Shrinkage, inch/inch, Mold #2, Volume .344 Gal.
.001.001 <.001
Specific Gravity, grams, cc
Density, lb/cu inch
Specific Volume, cu in/ lb
Tensile Strength, psi
8400 psi
7860 psi
7916 psi
Flexural Strength, psi
13800 psi
12200 psi
17329 psi
Compressive Strength, psi
29000 psi
24000 psi
21113 psi
 Glass Transistion Temp, DMA
Tg, E’ Onset
Tg, Peak
Intended for Room Temperature Service
307 F
333 F


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.