ET50 is an aluminum powder filled epoxy casting resin system that provides service temperatures to 350° F (177°C). ET50 is most commonly
used for the construction of molds that require good heat conductivity, outstanding durability, and that provide production run capability.
The majority of applications for ET are used in conjunction with other materials in developing composite mold structures.
The composites approach to mold construction uses ET50 as a binder for SC-124 Aluminum Granules. This mixture is cast behind a high
temperature surface coat, ET10 or ET15. This combination provides several benefits. The ET10 or ET15 surface coat provides exceptional
durability, and the aluminum granule addition to the ET50 provides vastly increased heat conductivity and reduced shrinkage. In addition
this method will decrease coast. Generally, the SC-124 Aluminum Granule is added at the rate of 60 parts by weight to 100 parts by mixed
resin and hardener. Larger amounts of aluminum granules are added when vacuum form molds, casting molds, foam molds, and other low
pressure compression type molds.
|Hardness, Shore D ASTM D-792||90|
|Specific Gravity, (gm/cc) ASTM D-2240||1.69|
|Volumetric Weight, (cu.in./lb) ASTM D-792||17|
|Compressive Strength, (psi) ASTM D-695||27,800|
|Flexural Strength, (psi) ASTM D-790||11,100|
|Flexural Modulus, (psi) ASTM D-790||1.06X106|
|Tensile Strength (psi) ASTM D-638||8,150|
|Shrinkage, (in./in.) ASTM D-2566||.002|
|Heat Deflection Temperature, (264 psi) ASTM D-648||311°F (155°C)|
|Coefficient of Thermal Expansion, (in/in./°F) ASTM D-3386||1.9X10-5|
|Work Life@ 770F(250C)||60 minutes|
|Demold Time@ 750-80F(240-27°C)||16-24 hours|