CAPABILITIES

Hi-Rel Plastics & Molding, Inc. utilizes liquid injection molding (LIM) using liquid silicone rubber (LSR) to manufacture molded silicone parts, gaskets. Utilizing its extensive experience with LIM and LSR, Hi-Rel Plastics & Molding, Inc. has selected the top performing liquid silicone rubber materials and processes for these custom components. LSRs are injection molded with faster cure cycles than gum base silicones. LSR components are UV and ozone resistant and have excellent water sealing properties. Liquid silicones can be molded into intricate parts with thin or thick cross sections.

Benefits of Liquid Injection Molding (LIM)

Faster cure cycles are a key benefit for specifying LSR for molded gaskets and seals. Cure cycles of 30 to 60 seconds are typical for small gaskets and cushioning components with thin cross-sections. This means a single or two cavity liquid injection mold can out-produce a multi-cavity compression mold due to the 6 to 8 minute cure cycles that are typical of gum base silicones. Fewer cavities in the liquid silicone mold can improve tooling lead times and improve dimensional consistency.

Benefits of Liquid Silicone Rubber (LSR)

Hi-Rel Plastics & Molding, Inc. uses platinum cure silicone compounds to make injection molded parts. Some key features that make LSR the material of choice for many applications include:

• Wide hardness range of 10 to 80 durometer Shore A
• Wide operating temperature (-58°F to 392°F)
• Good elongation properties
• Excellent electrical insulation
• Excellent UV and ozone resistance
• Excellent for outdoor environmental sealing
• Good for submerged sealing uses (IP67 and NEMA 6)
• Good material for low temperature cushioning (cold drop test)
• Many available standard colors and custom colors for molded parts