●Material properties: focus on the vulcanization system (platinum/peroxide), hardness range (10-90ShoreA), transparency (light transmittance>90%);
●Process capability: examine microporous molding (minimum aperture 0.1mm), two-color injection molding, and encapsulation process (strength of bonding between silicone and PC/ABS);
●Certification system: medical grade requires ISO13485, food grade requires FDA, and electronic grade requires UL94V-0.
2. Supplier selection trap
●Beware of " low price trap": a random inspection on an e-commerce platform showed that the qualified rate of silicone products below 30 yuan was less than 40%, and the rate of phthalates exceeding the standard was 65%;
●Choose the " OEM factory " carefully: some companies only provide assembly services, rely on outsourcing for core technologies (such as molds and formulas), and have poor quality stability.