Release Agent 1502/353 for Injected Safety Footwear

In dual-density injection processes (outsole + comfort sole), the quality of adhesion between layers determines:

• Resistance to delamination
• Compliance with safety standards (e.g. S1, S3, SRC…)
• Durability of the shoes in the field
• Scrap rate during production

In tropical areas or during summer, excessive humidity can compromise the chemical bonding between PU materials. The risks of bubbles, blisters or delamination increase, jeopardizing line productivity.

In injected safety footwear production lines, the demolding stage is strategic. Keck Chimie’s release agent 1502/353 is engineered to meet manufacturers’ technical requirements by ensuring:

• Clean and residue-free demolding
• Enhanced interlayer adhesion between outsole and comfort sole (PU on PU)
• Optimal compatibility with dual-density polyurethane injection processes, commonly used in standardized production lines (S1, S3…)

Designed for humid or tropical industrial environments, this technical product can be easily integrated into professional footwear production lines in Europe, Asia, and Latin America.

The silicone-based release agent 1502/353, developed by Keck Chimie, addresses the specific challenges of dual-density PU injection, particularly in high-humidity industrial conditions.

Its silicone-based formulation incorporates an exclusive technical additive that strengthens chemical bonding between the two sole layers (outsole and comfort sole), even in difficult environments:

• Mold condensation
• Hot, steam-saturated atmospheres
• Materials with low initial adhesion

Technical advantages for safety footwear manufacturers:

• Homogeneous spray application (manual or automated)
• Excellent adhesion to PU soles without deformation or adhesion defects
• Matte finish on the outsole (aesthetic, ergonomic, and anti-slip criteria)
• Improved injection success rate on complex materials
• Reduced bonding defects, bubbles, or interlayer separations

This is a strategic choice for manufacturers of safety footwear, particularly in the construction, logistics, heavy industry, or food processing sectors.

With 1502/353, Keck Chimie confirms its role as a technical partner serving manufacturers of injection-molded safety footwear. This new silicone-based release agent complements a wide range of adhesives and auxiliaries developed to meet the specific requirements of PU injection workshops in the construction, logistics, food processing, and heavy industry.

Need a silicone-based release agent that is effective even in humid environments? Contact a French manufacturer specialized in chemical solutions for polyurethane sole injection today.

Request a tailored technical recommendation for your production requirements: contact a release agent manufacturer for safety footwear.