Ultra-Low Shrinkage ≤0.1% LSR Platinum Cure Silicone Rubber with 1:1 Mixing Ratio for High Precision Jewelry Casting

Ultra Low Shrinkage LSR Platinum Cure Liquid Silicone Rubber for High Precision Jewelry Casting

Hanast supplies an LSR platinum cure liquid silicone rubber with ultra-low shrinkage, engineered for high-precision jewelry and resin casting molds. The 1:1 mixing ratio and addition-cure platinum system capture intricate filigree, gemstone settings and fine surface textures with superior dimensional accuracy, supplied as model HN-E630 (30 Shore A) with full custom OEM/ODM support.

Key Features

• Ultra-Low Shrinkage ≤0.1% – Exceptional dimensional accuracy for high-precision jewelry reproduction.
• High Detail Reproduction – Captures intricate filigree, gemstone settings and fine textures.
• 1:1 Easy Mixing Ratio – Equal-part A:B mixing reduces operator error.
• RTV-2 Addition Cure (Platinum) – Odorless, non-toxic curing with no by-products.
• LSR Grade – Liquid silicone rubber with consistent, repeatable production quality.
• Good Tear & Tensile Strength – 6.2 MPa tensile and 16 kN/m tear for durable, reusable molds.
• RoHS & REACH Compliant – FDA, MSDS, RoHS and REACH documentation for export markets.

Technical Specifications (HN-E630, 30 Shore A)

Recommended Applications

• High-precision jewelry and filigree mold making
• Gemstone setting and fine-detail reproduction molds
• Resin casting, epoxy and UV resin molds
• Decorative craft and ornament molds
• Prototyping and precision casting
• Fashion accessories, buckles and hardware molds
• Figurine, miniature and model molds
• Cultural, artistic and restoration reproduction
• General precision liquid silicone rubber molding

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 to remove entrapped air for bubble-free detail capture.
5. Pour within the 30-40 min pot life; ensure full coverage of fine details.
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

Factory-direct supply from a 40,000 m² production base (100 tons/month), packed in 20 kg / 25 kg / 200 kg drums with full MSDS and TDS documentation. MOQ from 1 kg with free trial samples; custom OEM/ODM and wholesale bulk pricing available.

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 shrinkage of this LSR silicone rubber and why does it matter for jewelry?
A: Linear shrinkage is ultra-low at ≤0.1%. For high-precision jewelry and filigree casting, this ensures the mold reproduces fine details, stone settings and dimensions accurately and consistently from the master pattern, batch after batch.
2. Q: What is the mixing ratio and cure schedule?
A: Mix Component A and Component B at 1:1 by weight. Pot life is 30-40 minutes at 25°C. Cure in 3-4 hours at room temperature, or accelerate to about 20 minutes at 80-100°C. Vacuum-degas the mixed silicone for bubble-free, high-definition molds.
3. Q: What hardness and viscosity are available?
A: The HN-E6XX series covers 0-60 Shore A with a shared 1:1 ratio and 30-40 minute pot life. This listing is HN-E630 (30 Shore A, viscosity 5000 ± 500 mPa·s); typical jewelry grades fall in the 20-40 Shore A range. Viscosity and hardness are customizable (800-20000 cps), and softer grades suit delicate crafts while harder grades suit rigid molds.
4. Q: How do I prevent platinum catalyst poisoning?
A: Addition-cure (platinum) silicone can be inhibited by organotin compounds, sulfur/polysulfide, amines, polyurethane, phosphorus compounds, organic acids and solder-flux residues. Use clean, dry substrates, tools and containers, avoid tin-cure silicone residue, and test any colourant, resin or filler before production as it may deactivate the platinum catalyst.
5. Q: What are the MOQ, sample policy, certifications and delivery?
A: MOQ is only 1 kg, with free trial samples available. Supply ability is 100 tons per month. Packaging is 20 kg / 25 kg / 200 kg drums with MSDS and TDS included; shelf life 12 months. Certifications: FDA, MSDS, RoHS, REACH. Lead time is about 3-5 days for samples and 10-15 days for bulk/OEM orders — contact us for factory-direct bulk pricing.