Brand Silastic Application Type Mold-Making 1 Part or 2 Part 2 Part Material Form Liquid Manufacturer Dow Chemistry Silicone rubber Cure Method Part A/Part B, Heat Cure Temperature (°C) 171, 200 Cure Time (min) Fast, 5.00, 0.13 to 0.23 Color Off White Key Specifications UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: UL 94 V-1
Technical Data for Dow Silastic 591
- Casting / Moldmaking - Mold-Making
1 Part or 2 Part
- 1 Part or 2 Part - 2 Part
- Part A Name - Part A
- Part B Name - Part B
- Silicone - Silicone rubber
- Dispenser - Meter mix equipment
- 2-Part Cure - Part A/Part B
- Off-White - Off White
- UL (Underwriters Laboratory), ULC (Underwriters Laboratories of Canada), NFPA (National Fire Protection Association): UL 94: V-1 - UL 94 V-1
Cure Temperature (°C) 171, 200 Test Method Cure Time (min) Fast, 5.00, 0.13 to 0.23 Test Method Linear Shrinkage (%) Low Mix Ratio 1:1 (by volume)
Tear Strength (piw) 73 (ppi) Test Method Tensile Strength (psi) 485 Test Method
Shore A Hardness 51 Test Method Elongation (%) 4 Test Method
Specific Gravity 1.540 Test Method Flash Point (°F) 212.0 % Solids (%) 100
Shelf Life Details When stored at or below 32°C (90°F) in the original, unopened containers this product has a usable life of 18 months from the date of production. Shelf Life Type from the date of production. Shelf Life (mon) 18
Best Practices for Dow Silastic 591
The A and B components are supplied strained and de-aired to be used as lot matched kits. Mix parts A and B in a 1:1 ratio. Meter mix equipment which pumps, meters and mixes the two components without the incorporation of air is strongly recommended for production.
If air bubbles are entrapped during mixing the mixture must be thoroughly de-gassed under vacuum.
SILASTIC 591 cures rapidly at elevated temperatures. A 2mm cross-section requires 8-14 seconds at 200°C (392°F). The cure time depends on the thickness and the cure temperature used. Cure can be inhibited by contact with certain materials such as amines, sulphur and tin complexes.
The uncured silicone can readily be removed by most hydrocarbon solvents. Polar solvents, such as ketones and alcohols, are not suitable.
Comparable Materials for Dow Silastic 591
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Cure Temperature Test Methods
|Cure Temperature||Cure Time Test Method|
Cure Time Test Methods
|Cure Time||Test Method|
|5.00 min||Press cured|
|0.13 to 0.23 min|
Work / Pot Time Test Methods
|Work / Pot Time||Temperature|
Tear Strength Test Methods
|Tear Strength||Test Method|
|73 (ppi)||ASTM D624 DIE B|
Tensile Strength Test Methods
|Tensile Strength||Test Method|
|485 psi||ASTM D412 DIE C|
Elongation Test Methods
|4 %||ASTM D412 DIE C|
Shore A Hardness Test Methods
|Shore A Hardness||Shore Hardness Test Method|
|51||Hardness/Durometer Test Method|
Specific Gravity Test Methods
|Specific Gravity||Test Method|