Dual Cure Food Grade Platinum Cure Silicone Rubber with 1:1 Mix Ratio for GRC Architectural Concrete Molds

40 Shore A Dual Cure Food Grade Platinum Silicone Rubber 1:1 for GRC & Architectural Concrete Molds

This HN-E640 is a two-component, dual cure (room-temperature or heat-accelerated) addition-cure platinum liquid silicone rubber supplied in a 1:1 mix ratio by weight. With a 40 ± 2 Shore A hardness, 6.0 MPa tensile strength and linear shrinkage of ≤ 0.1%, it reproduces the finest surface detail of architectural concrete, GRC, 3D wall panels and veneer stone moulds while keeping the mould dimensionally stable over many casting cycles.

Key Features

• Dual cure system — cures at room temperature (3–4 h) or heat-accelerated (80–100 °C in ≤ 20 min) for flexible production planning
• 1:1 mix ratio (A : B by weight); 30–40 min pot life; easy mixing and bubble removal
• Food grade & safe — FDA, MSDS, RoHS and REACH compliant; non-toxic, odourless, non-corrosive
• Ultra-low shrinkage ≤ 0.1% with no low-molecule release during crosslinking → high dimensional accuracy
• High tensile strength & toughness — 6.0 MPa tensile, 14 kN/m tear, 450% elongation for long-lasting moulds
• Wide temperature range −50 °C to 200 °C; waterproof, ozone and aging resistant
• Low viscosity for good fluidity and fast pouring into complex mould frames
• Customisable hardness, viscosity and working time per customer requirements; OEM / ODM and private label service available

Technical Data (HN-E640)

Recommended Applications

• Architectural concrete & GRC / GFRC moulds — facade panels, cornices, balustrades, decorative columns and precast concrete elements
• 3D wall panel & wall tile moulds — embossed interior/exterior wall panels and cement wall tiles
• Artificial & cultural stone moulds — veneer stone, culture stone, faux marble, terrazzo and imitation stone products
• Gypsum & plaster moulds — plaster cornice, gypsum line, ceiling rose and architectural ornament moulds
• Statue, sculpture & crafts moulds — cement/stone/resin sculptures, figurines and art crafts
• Resin, epoxy & polyester casting moulds — decorative resin parts, prototypes and vacuum casting
• Food-contact moulds — chocolate, candy, cake, soap and candle moulds (food-grade, 1:1)
• General RTV-2 mould applications requiring high precision and long service life

Mixing & Application Instructions

1. Pre-mix: stir Components A and B thoroughly before use.
2. Weighing: accurately weigh A and B in a 1:1 ratio by weight with a precision scale.
3. Mixing: mix for 2–3 minutes until uniform; scrape the container walls and bottom.
4. Degassing: for bubble-free moulds, degas under vacuum to remove entrapped air.
5. Pouring: pour into the clean, dry mould frame within the 30–40 min pot life; ensure full coverage.
6. Curing: cure at room temperature for 3–4 h, or heat at 80–100 °C for ≤ 20 min; demould after full cure.

Catalyst poisoning warning: this addition-cure (platinum) silicone may fail to cure in contact with organotin, sulfur/polysulfide, amine, polyurethane, phosphorus compounds, organic acids or solder flux residues. Keep all substrates, tools and containers clean and free of these contaminants, and do not mix with tin-cure (condensation) silicone residues.

Wholesale Supply & Custom Manufacturing

As a China-based silicone manufacturer and factory-direct supplier, we support bulk wholesale, export volume orders and custom OEM / ODM projects. Hardness (0–60 Shore A), viscosity, colour, pot life and curing time can all be tailored to your application. Free samples are available for evaluation, with fast sample turnaround and stable bulk lead times.

• MOQ: 20 kg
• Supply Ability: 100 Tons per Month
• Delivery: 3–5 days for samples, 10–15 days for bulk production
• Payment: T/T, L/C, PayPal, Western Union
• Packaging: A and B in 10 / 20 / 25 kg drums; 20 / 40 / 50 kg per kit set

About This Supplier

Shenzhen Hanast New Materials Co., Ltd. is a professional manufacturer of liquid silicone rubber specialising in addition-cure (platinum) and condensation-cure silicone for mould making. Our HN-E6XX platinum series covers 0–60 Shore A and is certified to FDA, MSDS, RoHS and REACH, serving customers in construction, architecture, arts & crafts, food-contact and precision casting industries worldwide.

FAQ

1. Q: What is the mix ratio and cure schedule of this dual cure silicone rubber?
A: Mix Components A and B in a 1:1 ratio by weight. Pot life is 30–40 minutes at 25 °C; it cures at room temperature in 3–4 hours, or heat-accelerated at 80–100 °C in 20 minutes or less.

2. Q: Is it suitable for architectural concrete, GRC and 3D wall panel moulds?
A: Yes. At 40 Shore A with 6.0 MPa tensile strength, 14 kN/m tear strength and ≤ 0.1% shrinkage, it is well suited to architectural concrete, GRC/GFRC, 3D wall panels, veneer stone and other rigid, high-wear moulds.

3. Q: How do I choose the right hardness grade?
A: The HN-E6XX series spans 0–60 Shore A. Softer 0–20 A suits delicate and food-contact moulds, 25–40 A suits general crafts, resin and GRC, while 40–60 A suits rigid, high-wear architectural and concrete moulds. Parameters can be customised on request.

4. Q: How can I avoid platinum catalyst poisoning?
A: Keep substrates, tools and containers free of organotin, sulfur/polysulfide, amines, polyurethane, phosphorus compounds, organic acids and solder flux residues, and never mix with tin-cure silicone residues.

5. Q: What are the MOQ, lead time and packaging?
A: MOQ is 20 kg. Samples ship in 3–5 days and bulk orders in 10–15 days. A and B are packed in 10/20/25 kg drums, or 20/40/50 kg per kit set. Certifications: FDA, MSDS, RoHS, REACH. Free samples are available.