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Description for Dow Silastic 55U
High mechanical properties; high tear strength; serviceable over a wide temperature range; pigmentable.Brand Silastic Application Type Mold-Making 1 Part or 2 Part 2-Part Material Form Liquid Manufacturer Dow Chemistry Silicone rubber Cure Method Base/catalyst Cure Temperature (°C) 116, 200 Cure Time (min) 5.00, 240 Color Nearly transparent -
Technical Data for Dow Silastic 55U
Overview
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Application Type
- Casting / Moldmaking - Mold-Making
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1 Part or 2 Part
- 2-Part
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Material Form
- Liquid
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Chemistry
- Silicone - Silicone rubber
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Cure Method
- 2-Part Cure - Base/catalyst
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Color
- Clear / Transparent - Nearly transparent
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Brand
- Silastic
Specifications
Cure Specs
Cure Temperature (°C) 116, 200 Test Method Cure Time (min) 5.00, 240 Test Method Bond Strength
Tear Strength (piw) High, 180 (ppi) Test Method Tensile Strength (psi) 1,295, 1,290 Test Method Hardness
Shore A Hardness 49, 50 Test Method Elongation (%) 630, 485 Test Method Modulus (psi) 200, 280 Test Method Other Properties
Specific Gravity 1.170 Test Method Business Information
Shelf Life Details When stored at or below 60°C (140°F) in the original unopened containers, this product has a usable life of 36 months from the date of production. Shelf Life Type from the date of production Shelf Life (mon) 36 -
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Best Practices for Dow Silastic 55U
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Spec Engine® Results
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Cure Temperature Test Methods
Cure Temperature | Cure Time Test Method |
---|---|
116°C | Press cured |
200°C | Post cured |
Cure Time Test Methods
Cure Time | Test Method |
---|---|
5.00 min | Press cured |
240 min | Post cured |
Tear Strength Test Methods
Tear Strength | Test Method |
---|---|
High | |
180 (ppi) | ASTM D624, DIE B |
Tensile Strength Test Methods
Tensile Strength | Cure Time | Cure Temperature | Test Method |
---|---|---|---|
1,295 psi | ASTM D412 | ||
1,290 psi | 4,200 min | 225°C | ASTM D412 |
Elongation Test Methods
Elongation | Test Method |
---|---|
630 % | ASTM D412 |
485 % | ASTM D412, Heat aged, 70hrs 225°C (437°F) |
Modulus Test Methods
Modulus | Test Method |
---|---|
200 psi | ASTM D412, at 100% elongation |
280 psi | ASTM D412, at 100% elongation, Heat aged, 70hrs 225°C (437°F) |
Shore A Hardness Test Methods
Shore A Hardness | Shore Hardness Test Method | Hardness Temperature |
---|---|---|
49 | Hardness/Durometer Test Method | 225°C |
50 | ASTM D2240 |
Specific Gravity Test Methods
Specific Gravity | Temperature | Test Method |
---|---|---|
1.170 | 23°C | ASTM D792 |