The choice of release agent for polyurethane molds is critical due to the chemical structure of polyurethane (reactive and adhesive nature). The aim is to ensure easy demolding of the part without compromising surface quality.
Which release agent should be used in polyurethane molds?
1. Water-based release agents
- Most preferred type
- Leaves low residue
- More suitable for painting and coating processes
- Advantageous for environmental and operator safety
2. Silicone-based release agents (controlled use)
- Provides high lubricity
- Effective in difficult-to-open molds
- However, can leave silicone residue on the surface
- Risky for parts to be painted/bonded
3. Non-silicone release agents
- Ideal for parts to be painted and coated
- Does not reduce surface energy
- Provides cleaner surface quality
4. Semi-permanent release agents
- Chemically adheres to the mold
- Can be effective for several cycles
- Increases production efficiency
- Frequently used in industrial mass production
Selection criteria
- Suitability for polyurethane type (rigid / flexible / foam)
- Mold temperature
- Part's painting or bonding requirement
- Cycle time and production speed
- Expected surface quality
Things to avoid
- Excessive silicone use (surface defects and paint adhesion failure)
- Cheap release agents that leave high residue
- Solvent-based products unsuitable for the process
You can contact us for technical support regarding solutions suitable for your business.
