Certified Liquid Silicone Rubber: Meeting FDA, RoHS, and High-Performance Standards

Dongguan Times Silicon Industry Co., Ltd. is a Chinese manufacturer specializing in the research, development, and production of addition-curing liquid silicone rubber and related silicone materials. For engineers and procurement professionals evaluating Liquid Silicone Rubber (LSR), certification compliance — such as FDA 21 CFR 177.2600, RoHS, REACH, and ISO 9001 — is often a non-negotiable requirement. This article examines the certification landscape, product parameters, and supply capabilities of a certified LSR producer, using Dongguan Times Silicon as a case study.

Why Certification Matters in LSR Procurement

Liquid Silicone Rubber is used in applications ranging from medical devices and food-contact products to electric vehicle battery sealing and high-voltage electrical insulation. In each of these fields, regulatory standards dictate material composition, biocompatibility, and safety. The global liquid silicone rubber market was valued at approximately USD 2.8–3.8 billion in 2024, with medical-grade LSR alone generating USD 458.7 million the same year (Grand View Research). For automotive and energy storage, 63% of EV battery pack sealing systems use silicone elastomers (Precedence Research/IEA). These numbers underscore the demand for certified materials that can withstand harsh conditions while meeting chemical and safety regulations.

Certification Portfolio of Dongguan Times Silicon

Dongguan Times Silicon Industry Co., Ltd. has built its quality system around internationally recognized certifications. The company operates a 15,000 m² factory with an ISO 9001:2015 certified management system (certificate number 25025Q12678R0S, issued by ZhongQiu United International Certification). All product lines — including Adult Products LSR for Overmolding, Vinyl Silicone Oil, fiber glass sleeve coating resins, platinum catalysts, and formed liquid foamed silicone rubber — comply with RoHS, REACH, FDA, LFGB, and halogen-free standards. Additionally, the company holds a High-tech Enterprise Certificate (GR202444010636) jointly issued by China’s Ministry of Science and Technology, Ministry of Finance, and State Taxation Administration, as well as a Utility Model Patent (ZL202323622488.5) for its fiber glass sleeve silicone resin technology.

Certification Map by Product Family

Key Product Parameters for Performance‑Driven Applications

Beyond certifications, physical properties such as hardness, viscosity, tear strength, and temperature resistance are critical selection criteria. Dongguan Times Silicon offers controlled parameters across its range:

• Adult Products LSR for Overmolding (TS6807A/B – TS6838A/B): Hardness from 7±1 Shore A to 38±1 Shore A, viscosity 4,000–25,000 mPa·s, clear appearance. Ideal for soft-touch, high‑resilience overmolding.
• Vinyl Silicone Oil (TVF series): Viscosity from 35 mPa·s to 500,000 mPa·s, vinyl content 0.037–1.497%, volatile <0.5%. Used as base polymer in LSR formulations.
• Fiber glass sleeve silicone resin (TS3034B – TS6125A/B): Heat resistance up to 200°C, cold resistance to –55°C (hardening), –73°C (brittleness). Viscosity 10,000–55,000 mPa·s. Provides UL‑94 V‑0 flame retardancy and high voltage insulation.
• Platinum catalyst (TPL-1000 – TPL-5000, PTR series): Platinum content 1,000–5,000 ppm, transparent, low volatility. Enables efficient hydrosilylation at low addition levels.
• Special base adhesive for liquid foaming (BAS‑1716, BAS‑1812, BAS‑80931): Tensile strength 5–7 MPa, tear strength 15–17 kN/m, elongation 300–500%. For foamed gaskets and sealing in electrical and automotive applications.

Step‑by‑Step: How to Evaluate a Certified LSR Supplier

1. Define end‑use compliance requirements (e.g., FDA food contact, UL flame class, ISO 10993 biocompatibility).
2. Request certification documentation — verify ISO, REACH, RoHS, and any target‑market approvals.
3. Review technical data sheets for hardness, viscosity, tear strength, and temperature range.
4. Request samples for in‑house process trials; assess curing speed, odor, and adhesion.
5. Evaluate supply flexibility — MOQ, lead time, customization capability (color, hardness, packaging).

Dongguan Times Silicon supports custom formulations with a MOQ as low as 1 kg for standard products and 5 kg for custom blends. Lead time is 7–10 working days for stock items, and 15–25 working days for tailored bulk orders. Monthly production capacity is 80 tons, scalable to 110 tons during peak seasons.

Real‑World Use Cases

Adult Products & Personal Care

A major Chinese brand client purchases 80 tons per year of Adult Products LSR for Overmolding (TS68 series). After switching to Times Silicon’s low‑odor, FDA‑compliant formulation, the client reduced defect rates from 3% to 0.8%, improved product yield to 98%, and increased end‑user repurchase rate by 18%.

New Energy Vehicle Battery Sealing

The company’s formed liquid foamed silicone rubber and vinyl silicone oil are used in battery pack sealing, leveraging 63% industry adoption of silicone elastomers for EV battery systems. The material provides thermal stability (–60°C to 200°C) and high voltage insulation required for battery modules.

Electrical Insulation – Fiberglass Sleeves

A Yangtze River Delta automotive wire harness factory uses 300 tons per year of fiber glass sleeve silicone resin (TS3034B/TS3045B). The coating defect rate dropped from 2.8% to 0.5%, and sleeve products maintain ≥10 year service life under normal conditions. The resin’s flexibility and adhesion allow compatibility with existing impregnation lines.

Platinum Catalyst for LSR Production

A Pearl River Delta liquid silicone manufacturer purchases 80 kg/year of platinum catalyst (TPL series). Curing efficiency increased by 30%, per‑batch capacity rose 25%, and defect rates fell from 2.5% to 0.6%.

Frequently Asked Questions