Ultra Low Shrinkage Platinum Cure Silicone Rubber 15 Shore A 1:1 Mix Ratio LSR Liquid Silicone Rubber for Jewelry Casting Molds

Ultra Low Shrinkage LSR 15 Shore A Platinum Cure Silicone Rubber 1:1 for High Precision Jewelry Casting Molds

This HN-E615 is a two-component 1:1 addition-cure (platinum) liquid silicone rubber (LSR) with 15 ± 2 Shore A hardness and ultra-low shrinkage (≤ 0.1%). Its soft, high-detail nature captures the finest filigree and gemstone-setting details, while the near-zero shrinkage delivers exceptional dimensional accuracy for high-precision jewelry, craft and prototype casting moulds. Food-grade certified (FDA) for food-contact applications too.

Key Features

• Ultra-low shrinkage ≤ 0.1% — exceptional dimensional accuracy and faithful reproduction for high-precision casting
• LSR liquid silicone rubber — low viscosity 3500 ± 500 mPa·s for easy pouring, mixing and bubble removal
• 15 Shore A ± 2 — soft grade that captures the finest detail, ideal for delicate jewelry and crafts
• 1:1 mix ratio (A : B by weight); 30–40 min pot life; cures at room temperature (3–4 h) or heat-accelerated (80–100 °C in ≤ 20 min)
• High elongation (600%) & 5.7 MPa tensile strength for durable, tear-resistant moulds
• Food grade & safe — FDA, MSDS, RoHS and REACH compliant; non-toxic, odourless, non-corrosive
• Wide temperature range −50 °C to 200 °C; waterproof, ozone and aging resistant
• Customisable hardness (0–60 Shore A), viscosity and working time; OEM / ODM and private label service available

Technical Data (HN-E615)

Recommended Applications

• High-precision jewelry casting moulds — rings, pendants, filigree and gemstone-setting masters
• Wax & resin jewelry prototyping — lost-wax patterns and master models
• Resin, epoxy & UV resin casting moulds — detailed decorative parts and inlays
• Craft & figurine moulds — miniature models, collectibles and ornaments
• Precision & restoration moulds — replication of detailed parts and art restoration
• Food-contact moulds — chocolate, candy and cake moulds (food grade, 1:1)
• General RTV-2 mould applications requiring ultra-low shrinkage and fine detail

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 OEM / ODM and private-label projects plus bulk wholesale and export volume orders. Hardness, 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 jewellery, arts & crafts, construction, food-contact and precision casting industries worldwide.

FAQ

1. Q: Why is ultra-low shrinkage important for jewelry casting moulds?
A: With ≤ 0.1% shrinkage, HN-E615 keeps every cavity dimensionally accurate, so cast parts match the master precisely — critical for fine filigree, gemstone settings and multi-piece jewellery.
2. Q: What is the mix ratio and cure schedule?
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.
3. Q: How do I choose the right hardness grade?
A: The HN-E6XX series covers 0–60 Shore A. Soft 5–20 A (like this HN-E615, 15 A) is ideal for delicate jewellery and fine crafts; 25–40 A suits general moulds; 40–60 A suits rigid, high-wear moulds. Hardness can be customised.
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, packaging and certifications?
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 kits. Certified FDA, MSDS, RoHS and REACH. Free samples are available.