1. Common Types and Applications
Oil-Based Release Agents
Applications: Steel molds, precast concrete products
Advantages:
Smooth demolding performance
Provides corrosion protection for molds
Extends mold service life
Limitations:
May contaminate product surfaces
Can affect subsequent painting or bonding processes
Water-Based Release Agents (Recommended for Municipal Precast Products)
Applications: Manhole covers, curbstones, concrete products
Advantages:
Clean surface finish with no oil residue
Does not affect appearance or post-processing
Environmentally friendly
Limitations:
Requires even application
Over- or under-application may reduce effectiveness
Semi-Permanent Release Agents (Long-Life Type)
Applications: High-volume production, frequently used steel molds
Advantages:
One application can support multiple release cycles (typically 5–20 cycles)
Improves production efficiency
Limitations:
Higher cost
Requires strict mold surface preparation and cleanliness
Release Agents for Resin / Composite Materials
Applications: Resin manhole covers, SMC/BMC molds
Requirements:
High-gloss surface finish
Excellent non-stick performance
Non-corrosive to mold surfaces
2. Key Selection Principles
Steel molds + concrete products → Prefer water-based release agents
Worn molds or high adhesion issues → Use oil-based or semi-permanent agents
High surface finish requirements → Must use water-based agents; avoid heavy oil types
High-efficiency production → Use semi-permanent release agents