Platinum-cured silicone rubber, also known as addition-cured silicone rubber, is a high-purity, odorless RTV-2 silicone material. Both Component A and Component B exhibit a translucent, viscous state before mixing.
When mixed in a 1:1 ratio and stirred evenly, the material can cure at room temperature or be heat-accelerated for faster curing. Based on a platinum catalyst system, the curing process produces no by-products and offers excellent resistance to high and low temperatures, superior tear strength, and outstanding dimensional stability.
Curing Principle
Platinum-catalyzed addition curing, also known as hydrosilylation, is a reaction between cross-linkers rich in Si-H and vinyl-functionalized polysiloxanes. Unlike tin-cured silicone, the cure is initiated by the platinum catalyst and not moisture, so there are no issues with section thickness. Two-part systems do not release reaction by-products, allowing them to cure in closed environments.
FEATURES
Food Grade
Passed FDA 21 CFR 177.2600.
Easy To Use
Convenient 1:1 operation.
Low Viscosity
Easy bubble release.
Ultra-Low Shrinkage
≤0.1% for high precision.
Detail Reproduction
Captures finest details.
High Tear Strength
Durable for repetitive casting.
Heat Resistance
Up to 250°C (482°F).
Fast Cure
Room temp or heat cure.
APPLICATIONS
Platinum-cured silicone rubber is a highly versatile material due to its outstanding performance. Its food-grade, non-toxic properties make it perfect for culinary molds (baking, chocolate, candy). With ultra-low shrinkage and excellent detail reproduction, it is a top choice for rapid prototyping and industrial molds for casting resins, concrete, and foams. The high tear strength ensures durable, long-lasting molds suitable for repetitive casting cycles.
TECHNICAL DATA
| Product Name | Hardness | Mixing Ratio | Viscosity | Pot Life | Cure Time | Tear Strength |
|---|---|---|---|---|---|---|
| RTV-4100 | 0 C | 1A:1B | 2,800 cps | 30-40 mins | 4-5 hrs | 9 N/mm |
| RTV-4105 | 5 A | 1A:1B | 4,000 cps | 30-40 mins | 4-5 hrs | 11 N/mm |
| RTV-4110 | 10 A | 1A:1B | 4,000 cps | 30-40 mins | 4-5 hrs | 25 N/mm |
| RTV-4115 | 15 A | 1A:1B | 4,000 cps | 30-40 mins | 4-5 hrs | 26 N/mm |
| RTV-4120 | 20 A | 1A:1B | 4,700 cps | 30-40 mins | 4-5 hrs | 27 N/mm |
| RTV-4125 | 25 A | 1A:1B | 4,700 cps | 30-40 mins | 4-5 hrs | 26 N/mm |
| RTV-4130 | 30 A | 1A:1B | 4,400 cps | 30-40 mins | 4-5 hrs | 28 N/mm |
| RTV-4140 | 40 A | 1A:1B | 4,800 cps | 30-40 mins | 5-6 hrs | 32 N/mm |
Cure Inhibition Warning
Always ensure your master model and mixing tools are clean and free of the following substances:
- Sulfur Compounds: Sulfur-based modeling clays, natural rubber, latex gloves, some adhesives.
- Tin Compounds: Condensation-cure (tin-cured) RTV-2 silicones and their residues.
- Amine Compounds: Amine-catalyzed epoxy resins, some 3D printing resins (UV curable).
- Organometallic Salts & Additives: Notably those found in some PVC stabilizers.
General Processing Notes
- Always use Part A and Part B from the same model and batch to ensure consistent performance.
- Before committing to a large project, it is highly recommended to conduct a small test to confirm the silicone's suitability with your specific materials and process.
- Do not use the silicone at temperatures below 15°C (60°F), as this can significantly slow down or prevent proper curing.
Safety Precautions
- Platinum-cured silicone is considered non-toxic and generally safe for skin contact. No special precautions are required. For personal comfort or hygiene, vinyl gloves are recommended. Avoid using latex gloves, as they may cause cure inhibition.
- For molds intended for food contact, wash the cured mold thoroughly with soap and warm water before its first use.
- Keep out of reach of children. Adult supervision is required.
Storage & Shelf Life
- Storage Conditions
- Store in a cool, dry place (15-25°C / 60-77°F) away from direct sunlight.
- Shelf Life
- 24 months from manufacture date. High temperatures may shorten shelf life.
- Opened Containers
- Reseal immediately after use to prevent contamination.
