Smooth-On EpoxAcast™ 650 Special Order

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EpoxAcast™ 650 is a mineral filled general purpose casting epoxy resin that is low cost and versatile. It features a low mixed viscosity for minimal bubble entrapment.


EpoxAcast™ 650 is used for making hard dies for metal stamping as well as patterns and fixtures. It is also used for electrical encapsulation to extend the life cycles and enhance the performance of potted electronic devices. The high compressive strength of EpoxAcast™ 650 makes it ideal for making stamping dies for production pressing of metal ornaments.

Preparation – Avoid breathing fumes - use in a well ventilated area at minimum. NIOSH approved respirator is recommended. Wear safety glasses, long sleeves and rubber gloves to minimize skin contact.

Materials should be stored and used in a room temperature environment (73°F/23°C). Elevated temperatures will reduce Pot Life. EpoxAcast™ 650 Resin and Hardeners must be properly measured and thoroughly mixed to achieve full, high-strength, solidcure properties.

Because no two applications are quite the same, a small test application to determine suitability for your project is recommended if performance of this material is in question.

Applying A Release Agent – For releasing epoxy from non-porous surfaces such as resin, metal, glass etc., use Ease Release™ 200 or 205 (available from Smooth-On) to prevent adhesion.

IMPORTANT: To ensure thorough coverage, lightly brush the release agent with a soft brush over all surfaces of the mold or model. Follow with a light mist coating and let the release agent dry for 30 minutes.

Pre-mixing Part A – The fillers in this epoxy system will settle in the container over time. Before using, fillers need to be reconstituted by pre-mixing Part A thoroughly. The best method is to use a “turbine” mixer (available from Smooth-On) or similar drill mixer attached to a power drill and drill mix on medium speed for 2 minutes. Follow with hand mixing using a flat edge paddle for 1 minute until fillers are uniformly dispersed.

Measuring / Dispensing – The proper mixing ratio is 100 parts of EpoxAcast™ 650 resin to (12/13/14) parts hardener by weight whether using 101, 102 or 103 Hardener. You must use an accurate scale (gram scale or triple beam balance scale) to weigh these components properly. Do not attempt to measure components by volume.

Mixing tools and containers should be clean and dry. Mixing should be done in a well ventilated area. Wear safety glasses, long sleeves and rubber gloves to minimize contamination risk. Combine EpoxAcast™ 650 resin with the appropriate amount of hardener. Mix thoroughly for 3 minutes making sure that you scrape the bottom and sides of the container several times.

Adding Color - EpoxAcast™ 650 can be colored with UVO™ or IGNITE™ colorants. Pre-mix colorant with Part A thoroughly and then add Part B.

Mixing – Be sure mixing utensils are clean and free of any potential contaminants such as dirt, dust or grease. Mix Parts A and B thoroughly for at least 3 minutes with a square edged mixing stick. Be aggressive and scrape sides and bottom of mixing container several times. Use the square edge of mixing stick to bring material off of the sides of container and blend. If using a drill mixer, follow with hand mixing as directed above to ensure thorough mixing.

Adding Fillers - A variety of dry fillers can be added. Pre-mix dry filler with Part A before adding Part B.

Lowering Viscosity - Epic™ Epoxy Thinner is a clear, water-like liquid that will lower the viscosity of some Smooth-On casting and laminating epoxies. Epic™ is not a solvent and can be added in different proportions to improve flow-ability to make it easier to mix and pour or laminate. Epic™ will also aid in reducing bubble entrapment.

Increasing Flexibility - Flexer™ Epoxy Flexibilizer is a clear, low viscosity liquid additive that will lower the durometer (Shore hardness) of some Smooth-On casting and laminating epoxies. When added to the epoxy system in the proper proportion, the cured epoxy will be softer and, in some cases, can be made semi-rigid. See the Flexer™ Technical Bulletin for more information.

650 Part A SDS

101 Part B SDS

102 Part B SDS

103 Part B SDS

WITH 101 HARDENER----------------------------------------:
Mix Ratio by Weight: 100A:12B
Pot Life: 20 Minutes
Cure Time (@ 73°F/23°C): 1 Hour
Cure Time (@ 150°F/60°C): 30 Minutes
WITH 102 HARDENER----------------------------------------:
Mix Ratio by Weight: 100A:13B by weight
Pot Life: 90 Minutes
Cure Time (@ 73°F/23°C): 4 Hours
Cure Time (@ 150°F/60°C): 2 Hours
WITH 103 HARDENER----------------------------------------:
Mix Ratio by Weight: 100A:14B by weight
Pot Life: 3.5 Hours
Cure Time (@ 73°F/23°C): 24 Hours
Cure Time (@ 150°F/60°C): 6 Hours
Mixed Viscosity - CPS. (ASTM D2393) : 7,000
Specific Gravity - Mixed; g./c.c. (ASTM D1475): 1.52
Spec. Volume - Mixed; cu. in./lb. (ASTM D792): 18.22
Barcol 935 Hardness (ASTM D2240): 93
Ultimate Tensile - P.S.I. (ASTM D638) : 6,000
Tensile Modulus - P.S.I. (ASTM D638) : 1,503,000
Tensile Elongation (ASTM D638): 0.42
Flexural Strength - P.S.I. (ASTM D790): 5,890
Flexural Modulus - P.S.I. (ASTM D790): 710,000
Compressive Strength - P.S.I. (ASTM D695) : 16,350
Compressive Modulus - P.S.I. (ASTM D695) : 142,600
Shrinkage - in./in. (ASTM D-2566): 0.001
Heat Deflection Temp. (ASTM D648) If cured at room temperature: 129°F/54°C
Volume Resistance (ohm) (ASTM D257-99): >5.42E+11
Volume Resistivity (ohm cm) (ASTM D257-99): >3.59E+15
Dielectric Constant k’ @ 60 Hz (ASTM D150-98): 5.3
Dielectric Constant k’ @ 1 kHz (ASTM D150-98): 5.08
Dielectric Strength (V/mil) (ASTM D-147-97a): 404
All values measured after 7 days at 73°F / 23°C *Pot Life and Cure Time values are dependent on mass and mold configuration, as epoxies are mass-sensitive.:
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