PT4151 Versatile Epoxy Casting Resin
DESCRIPTION
PT4151
is a medium viscosity, easily poured epoxy casting resin specifically
formulated to provide a non-galling, self-lubricating cured surface.
PT4151 contains a special blend of non-metallic fillers that provide
easy mixing and handling, low shrinkage and special cured properties.
This resin is ideally suited for metal forming operations as well as a
variety of general tooling uses. PT4151 has been designed to be
virtually non-settling when stored under moderate temperature
conditions. If the resin is quite old, or if it has been exposed to
higher than normal temperatures, it should be stirred before use as a
normal precaution.
As PT4151 is an economical resin, it has been used extensively as a
tooling backup resin, with the incorporation of a variety of bulk
fillers. The mixed viscosity of the system is sufficiently low to allow
the addition of large quantities of sand, aggregates or other clean, dry
bulk fillers to provide low-cost tool backing.
PRODUCT SPECIFICATIONS
PT4151 Part A | PT4151 Part B | PT4151 Part B1 | ASTM Method | |
Color | Tan | Amber | Amber | Visual |
Viscosity, @77F, centipoise | 140,000 cps | 850 cps | 700 cps | D2392 |
Specific Gravity, gms./cc | 1.35 | .99 | .94 | D1475 |
Mix Ratio | 100 : 25 By Weight** | PTM&W | ||
Pot Life, 4 fl. oz. Mass @ 77F | 100 : 26 By Weight** | PTM&W |
** These are variable ratio hardeners that will provide good cures over a
wide ratio range. The optimum ratio range for these hardeners is 20% to
30%. In this range, the highest cured hardness and best physical
properties are obtained. Increasing the amount of hardener will lower
the final cured
hardness and increase the flexibility of the casting.
HANDLING & CURING
When using PT4151 with Parts B or B1, the material will cure completely
at room temperature. The amount of time to cure will depend upon shop
temperature, thickness of the casting and the insulating properties of
the pattern/mold material. PT4151 Part B hardener is recommended for
medium sized castings and for instances where bulk fillers are to be
incorporated. PT4151 Part B1 hardener is intended for larger solid mass
castings. The cure times for PT4151 were determined with 1000 gram
mixtures cast into metal quart cans at 75oF ambient temperature. Under
these conditions, PT4151 Part B required 24 hours, and PT4151 Part B1
required 48 hours to reach full properties.
PACKAGING WEIGHTS
Gallon Kit | Pail Kit | |
PT4151 Part A | 11 lb. | 30 lb. |
PT4151 Part B | 2.75 lb. | 7.5 lb. |
PT4151 Part B1 | 2.9 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.
TYPICAL MECHANICAL PROPERTIES
PT4151 A/B | PT4151 A/B1 | ASTM Method | |
Mix Ratio, By Weight | 100 : 25 | 100 : 26 | PTM&W |
Color | Tan | Tan | Visual |
Mixed Viscosity, @77F Centipoise | 6,500 CPS | 6,000 cps | D2393 |
Pot Life, 4 fl. oz. Mass @ 77F | 2 hours | 5 – 6 hours | D2471 |
Cured Hardness, Shore D | 85 Shore D | 84 Shore D | D2240 |
Shrinkage, in./in., Mold #2, Vol: .344 gal | .001 | .0009 | D2566 |
Specific Gravity, grams, cc | 1.34 | 1.31 | D1475 |
Density, lb./cu in. , lb./cu gallon | .0485, 11.2 | .0474, 10.9 | D792 |
Specific Volume, cu. in./lb. | 20.6 | 21.1 | D792 |
Tensile Strength, psi | 9,200 psi | 8,900 psi | D638 |
Flexural Strength, psi | 13,500 psi | 11,500 psi | D790 |
Compressive Strength | 17,000 psi | 14,500 psi | D695 |
SPECIAL INFORMATION
The chart below is provided to illustrate the effects of varying the mix
ratio of PT4151 resin and hardeners. As is typical of the
variable ratio type hardener, when the amount of hardener is increased
above the optimum, the cured hardness of the casting is
correspondingly decreased.

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.