Liquid silicone rubber products

Selecting the correct grade is critical for performance. For medical devices, ensure the material is USP Class VI or ISO 10949 compliant to guarantee biocompatibility. For food-contact items like kitchenware or baby nipples, verify FDA (CFR 177.2600) or LFGB (German food grade) certification. For industrial or automotive parts, focus on high tear strength, oil resistance, and thermal stability (typically ranging from -50°C to 200°C).

Buyers must specify the Durometer (Hardness), usually ranging from 10 to 80 Shore A, depending on the required flexibility. Pay close attention to Shrinkage Rates (typically 2-3%), which affect mold design and final dimensions. Additionally, confirm the Cure Time and Injection Pressure requirements to ensure the supplier's machinery is compatible with the specific LSR formulation.

Request a Compression Set Test report to ensure the material returns to its original shape after prolonged pressure. For colored products, verify Colorfastness and Pigment Stability under UV exposure. It is highly recommended to use Made-in-China.com's 'Verified Supplier' service to check if the manufacturer has ISO 9001 or IATF 16949 (for automotive) certifications and on-site audit reports.

LSR offers superior precision and shorter cycle times due to the injection molding process, making it more cost-effective for high-volume production. It provides better clarity (translucency), higher purity, and is processed in a closed system, which significantly reduces the risk of environmental contamination compared to traditional compression molding.

The primary risk is Material Substitution, where a supplier might use industrial-grade silicone instead of food/medical grade to save costs. To mitigate this, always request a material batch COA (Certificate of Analysis) and perform third-party lab testing (SGS/TUV) on random samples from the mass production lot.

LSR involves high Initial Tooling Costs (Molds). Negotiate for a rebate on mold fees once a certain order volume is reached. For MOQs, since LSR machines require significant setup time, suggest a blanket order strategy where you commit to a yearly volume but request staggered shipments to manage your inventory levels.

LSR products are prone to Static Electricity, which attracts dust. Ensure the supplier uses Anti-static PE bags and double-layered vacuum packaging for sensitive components. For shipping from China, clarify the Incoterms (FOB or CIF) and ensure the supplier provides a Non-Hazardous Chemical Declaration to avoid customs delays during export.

Always conduct transactions through Secured Payment Services provided by Made-in-China.com to protect your funds until the goods are shipped. Avoid direct wire transfers to private accounts. Utilize Inspection Services before the final balance payment to confirm that the dimensions, shore hardness, and quantity match the Proforma Invoice.