Shenzhen Factory Direct Custom OEM High Tear Strength Platinum Cure Silicone Rubber (40 Shore A)

Hanast is a Shenzhen-based direct factory manufacturer of high tear strength platinum cure silicone rubber, developed for GRC (Glassfiber Reinforced Concrete) and architectural concrete molds. With a 1:1 equal-part mixing ratio, good tear strength and ultra-low shrinkage of ≤0.1%, it delivers precise reproduction and long mold life for large-scale casting projects — supplied as model HN-E640 with full custom OEM/ODM support and bulk wholesale capacity.

Key Features

• High performance for GRC & concrete – 40 Shore A firm grade with good tear strength for repeated demolding cycles, reducing mold replacement frequency.
• Custom OEM / ODM formulations – Full E-Series 0–60 Shore A hardness range with custom viscosity and colour to match specific projects and private-label branding.
• Shenzhen factory direct supply – 40,000 m² production base with multi-ton batch capacity and B2B wholesale/export support.
• 1:1 simple mixing ratio – Suits manual pouring and automated dispensing in industrial production.
• Ultra-low shrinkage ≤0.1% – Preserves fine surface details of cultural stone, architectural panels and decorative ornaments.
• Addition cure (platinum) – No by-products, RoHS and REACH compliant, with MSDS and TDS documentation for export markets.
• Food-grade safety – Non-toxic, odourless and non-corrosive; stable from −50°C to 200°C with no low-molecule release during cure.

Technical Specifications (HN-E640, 40 Shore A)

Recommended Applications

• GRC and glassfiber reinforced concrete molds
• Architectural concrete and precast panel molds
• Cultural stone, artificial stone and decorative ornament molds
• 3D wall panels and wall cladding molds
• Concrete countertops, basins and terrazzo molds
• Plaster, gypsum and cement craft molds
• Architectural restoration and heritage reproduction
• Resin, epoxy and polyester casting molds
• Composite and master model / prototype molds

Mixing & Application

1. Pre-mix: stir Components A and B thoroughly before use.
2. Weigh A and B at exactly 1:1 by weight using a precision scale.
3. Mix thoroughly for 2-3 minutes, scraping the container walls and bottom.
4. Degas under vacuum for bubble-free molds.
5. Pour within the 30-40 min pot life; ensure full coverage.
6. Cure at room temperature for 3-4 h, or heat at 80-100°C for ≤20 min; demold after full cure.

Wholesale Supply & Packaging

Shenzhen factory-direct B2B supply, packed in 20 kg / 25 kg / 200 kg drums with full MSDS and TDS documentation. Custom OEM/ODM formulations, private label and bulk wholesale pricing are available; MOQ from 20 kg, supply ability 50 tons per month.

About This Supplier

Shenzhen Hanast New Material Co., Ltd. is a premier high-tech enterprise and leading source manufacturer specialising in the R&D, manufacturing and global supply of industrial silicone materials. As a strategic branch of the renowned Shenzhen Kanglibang Technology Co., Ltd., Hanast integrates over a decade of chemical adhesive expertise with a cutting-edge 40,000-square-meter modern production base (including our newly expanding Jiangmen facility) to deliver high-capacity, reliable material solutions worldwide.

We serve as a vital tier-one supplier and OEM/ODM partner for global factories, procurement managers and engineering teams across diverse sectors, including electric vehicles (EV), battery energy storage systems (BESS), solar inverters, LED lighting and industrial automation.

FAQ

1. Q: What is the mixing ratio and how do I use this platinum-cure silicone?

A: Mix Component A and Component B in a 1:1 ratio by weight. Stir each part before use, then mix A+B thoroughly for 2-3 minutes, scraping the container walls and bottom. For bubble-free molds, vacuum-degas the mix, pour within the 30-40 minute pot life, and cure at room temperature for 3-4 hours — or heat at 80-100°C for about 20 minutes for faster demolding.

2. Q: Which hardness grade should I choose?

A: The HN-E6XX series offers eleven grades from Shore A 0 to 60, all sharing the same 1:1 mix ratio, 30-40 minute pot life and 3-4 hour room-temperature cure. This listing is HN-E640 (40 Shore A) for GRC and architectural concrete molds; softer grades (E600-E620) suit food, jewellery and delicate crafts, while harder grades (E645-E650) suit the firmest rigid and high-wear molds. Custom hardness, viscosity and colour are available.

3. Q: Why might the silicone fail to cure, and how can I prevent it?

A: Addition-cure (platinum) silicone can be inhibited by organotin compounds, sulfur/polysulfide, amines, polyurethane, phosphorus compounds, organic acids and solder-flux residues. Always use clean, dry substrates, tools and containers, avoid contact with tin-cure silicone residue, and do not add colourants or fillers before testing, as they may deactivate the platinum catalyst.

4. Q: Is it food-grade and safe? What temperature can it withstand?

A: Yes. It is non-toxic, odourless and non-corrosive, certified to FDA, MSDS and RoHS, with excellent physiological inertness. The cured rubber is stable from −50°C to 200°C with very low shrinkage (≤0.1%) and no low-molecule release during cure, making it suitable for food, medical, craft and composite-mold applications.

5. Q: What are the MOQ, packaging, shelf life and delivery?

A: MOQ starts at 20 kg. Standard packaging is 10/20/25 kg drums, or 20/40/50 kg kits (A+B), with MSDS and TDS documentation included. Shelf life is 12 months when stored sealed below 25°C. Lead time is about 3-5 days for samples and 10-15 days for bulk/OEM orders; custom OEM/ODM formulations and wholesale bulk pricing are available — contact us for details.