Adhesive for Bonding Silicone and PC

Many customers struggle with adhesive selection for bonding PC and silicone, unsure of the suitable glue for unformed and formed silicone respectively. Next, I will help you choose the right glue.

Which adhesive is suitable for bonding unformed silicone to PC?​
CL-26AB-4 thermal vulcanizing adhesive is the preferred choice for bonding unformed silicone to PC. 

The process involves applying adhesive to the PC surface while the silicone is still uncured, then placing both components into a mold for heating and pressurization. At a high temperature of 120 to 140 degrees Celsius, the silicone completes its vulcanization and cross-linking while firmly adhering to the PC surface.

This one-piece molding method results in a very strong bond, making it particularly suitable for products requiring mass production using molds, such as phone case overlays and silicone buttons.

What adhesives are available for bonding finished silicone parts to PC?​
Two highly compatible adhesives are available for formed silicone-to-PC bonding, both delivering excellent and stable bonding performance. You can choose flexibly according to curing speed and actual application needs:​
1. KN-300A Slow-drying Adhesive: It is a food-grade, non-toxic adhesive that cures naturally at room temperature with no heating equipment required. Featuring easy operation, it is ideal for scenarios that require material safety and do not demand fast curing.​ It can be used in kitchenware, kettle seals, medical devices, and other products with high safety requirements.

2. Instant Adhesive + Matching Primer（601+K770）: It cures rapidly to greatly improve production efficiency with no long waiting time. Perfect for mass production and fast processing scenarios, the combination of instant adhesive and professional primer effectively solves the difficulty of bonding formed silicone to PC and achieves outstanding bonding strength.​ Ideal for assembly line operations, such as the rapid mounting of small-area electronic components.

How to quickly select the right one among the three adhesives?​
The core selection standard is the silicone state. Choose CL-26AB-4 for unformed silicone requiring thermal vulcanization. For finished silicone parts, select KN-300A for food safety requirements and room-temperature curing, or the instant adhesive with primer for fast curing and high-efficiency production.