Epoxocast EB 140u

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Very Low Coefficient of Thermal Expansion Casting Epoxy Compound.

 

Description:

Epoxobond EB140u is a low viscosity, highly filled, epoxy formulation which, in addition to having excellent electrical properties, has unusually low thermal expansion.

Properties - Uncured:-                                             Epoxocast EB140u  Epoxocure 9    Epoxocure 11

Color, visual                                                               Light Gray

Viscosity ASTM-D-2393 (c.p.s. @ 25C)               60,000-80,000

Specific Gravity                                                         2.3

Mix Ratio (weight)                                                     ---                                100: 2.5-3.5      100: 3.5-4-5

Mixed Viscosity ASTM-D-2393 (c.p.s. @ 25C)    ---                                40,000 cps       40,000 cps

Pot Life @ 25C (100 grams)                                  ---                                1 Hour               4-5 Hours

Shelf Life @ 70C                                                     12 months

Properties - Cured:-

Physical:

Hardness, ASTM-D-2240 (Durometer)                                                      Shore D 90      Shore D 92

Tensile Strength, ASTM-D-638                                                                   8,000 psi          8,500 psi

Tensile Elongation, ASTM-D-638                                                               1%                     1%

Compressive Strength, ASTM-D-695                                                         18,500 psi        25,000

Flexural Strength, ASTM-D-790                                                                  11,500 psi        13,000 psi

Coefficient of Thermal Expansion (cm/cm/C)                                           16x10(-6)          12x10(-6)

Heat Distortion Point                                                                                     150C                180C

Electrical:

Dielectric Strength, ASTM-D-149 (volts/mil)                                              475                    500

Dielectric Constant, ASTM-D-150                                                               6.3                     6.5

Dissipation Factor, ASTM-D-150                                                                0.02                   0.02

Volume Resistivity, ASTM-D-257 (ohm-cm)                                              1.3x10(16)        5x10(16)

Thermal Conductivity                                                                                     5 BTU               5 BTU

Mixing Instructions:

  1. Warm Epoxobond EB140U to 100F - 125F and stir contents thoroughly before withdrawing any material.

  2. Wiegh out required amount of Epoxobond EB140U and weigh into it 2.5 3.5 parts Epoxocure 9 per 100 parts Epoxobond EB140U; or 3.5 4.5 parts Epoxocure 11 per 100 parts Epoxobond EB140U.

  3. Mix curing agent in thoroughly.

  4. De-air (if necessary) at .5 cm. Hg. For 10 minutes.

  5. Pour into mold or cavity.

 

Cure Schedule:

Epoxocure 9 overnight at room temperature; or 2 hours at 150F.

Epoxocure 11 overnight at 125F; or 2 hours at 200F; or 1 hour at 250F.

NOTE:    For service temperature above 300F, post cure 2 3 hours at 325F to 350F.

 

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