Description
CHT QM 255 is a two-part, addition-cure silicone elastomer designed for producing high-detail, durable molds. It cures at room temperature to form a flexible, tear-resistant rubber that reproduces intricate surface textures while offering long-lasting dimensional stability.
Its 10:1 mix ratio and pourable viscosity make QM 255 easy to use for casting a variety of resin systems, including polyester, polyurethane (rigid or foam), and epoxy. It’s widely used for architectural reproduction, furniture and picture frame molding, technical prototypes, and composite parts.
Key Features & Benefits
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Excellent tear strength and elongation (durable molds)
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High casting resin resistance (polyester, PU, epoxy)
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Fast demold time (6–8 hours)
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Minimal shrinkage (<0.1%)
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Outstanding detail reproduction
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Long shelf-life (24 months)
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Can be repaired after cure
Common Applications
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Architectural replication and restoration
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Furniture and picture frame molds
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Prototype and technical part molding
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Casting with polyester, epoxy, and polyurethane resins
Technical Specifications
| Property | Value |
|---|---|
| Mix Ratio (by weight) | 10:1 |
| Work Life @ 25°C | ~20 minutes |
| Demold Time | 6–8 hours |
| Cure Type | Addition |
| Viscosity (Mixed) | 35,000 cP |
| Color (Cured) | Gray |
| Hardness (Shore A) | 55 |
| Elongation at Break | 400% |
| Tensile Strength | 450 psi (3.1 N/mm²) |
| Tear Strength | 13.9 N/mm (79 ppi) |
| Linear Shrinkage | <0.1% |
| Operating Temp | -55°C to +204°C |
| Shelf Life | 24 months |
Compatible Casting Materials
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Polyester resins
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Epoxy resins
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Rigid and foam polyurethane
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Plaster and other architectural media
Packaging & Ordering Info
| Size | Packaging | Mix Ratio | Contents (A/B) |
|---|---|---|---|
| 1.1 Kg Kit | Quart | 10:1 | 1 Kg A / 0.1 Kg B |
| 5.5 Kg Kit | Gallon | 10:1 | 5 Kg A / 0.5 Kg B |
| 19.8 Kg Kit | Pail | 10:1 | 18 Kg A / 1.8 Kg B |
| 242 Kg Kit | Drum | 10:1 | 220 Kg A / 22 Kg B |
Need Help Choosing or Ordering?
Contact our technical team at 800-220-1966 or [email protected] for assistance with moldmaking silicones and other casting solutions.
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