In the process of producing polyurethane products, it is necessary to use release agents. Whether it is PU high resilience, PU low resilience, PU self-skinning, and other types of products, they all rely heavily on release agents. The proper use of release agents has a direct link to the final quality of the product. It is not only necessary to use the release agent in a technically sound way, but it is also necessary to choose the right release agent. Today, we introduce 10 common types of mold release agents, what’re the features, and how to store them.
Soft Foam Release Agent
Product Description
PU soft foam release agent is compounded by various waxes, with high solid content, mainly used for car cushions, headrest backrests, toys, sound insulation cushions, blankets, mattresses, and other products, especially for 30-55 ℃ cold-ripening foam.
Product Index
| Appearance | Milky white liquid |
| Scent | No special odor |
| Density | Approx. 0.82 g/cm3 |
| Active substance content | 30% |
| Viscosity | Approx. 10-20cSt |
| Applicable temperature | 10℃-180℃ |
| PH value | Neutral |
Product Features
- No harmful solvents and heavy metal substances, such as alkyl phenols, amines, plasticizers, mercury, cadmium, and lead, reduce the evaporation of harmful gases during use.
- A very slight build-up of release agents in the mold.
- Superior mold release performance at low and medium temperatures, with the best effect when used at 30-60℃.
- Using can be brushed, rubbed, sprayed, and other ways to operate.
- Before use can be diluted with solvent 1:13-15 use, according to the size of the gun diameter and reasonable choice of dilution times.
Storage and handling methods
Keep containers tightly sealed to prevent solvent evaporation, and store ingredients at 20-38°C to ensure the best results and avoid freezing.
Hard Foam Release Agent
Product Description
PU hard foam release agent is an oil-based environmentally friendly release agent, mainly used for insulation materials, decorative materials, car crash parts, furniture, model hangers, plastic substitutes, and more.
Product Index
| Appearance | Milky white liquid |
| Scent | Very slight odor, environmentally friendly |
| Relative specific gravity(25℃) | Approx. 0.78 |
| Operating temperature | 20℃-180℃ |
| Viscosity | 32 |
| PH value | 7-7.5 |
Product Features
- Extremely easy to use and efficient demolding performance.
- The excellent surface gloss of the object to be demolded.
- Excellent adhesion to the mold surface, and excellent thermal stability, so the mold is essentially free of clogging and easy to clean.
Storage and handling methods
Store in the original airtight container at -20℃~+50℃, and must be stirred well before use.
Imitation Wood Release Agent
Product Description
PU imitation wood release agent is a kind of ready-to-use PU hard foam, semi-hard foam special release agent, mainly used for PU imitation wood furniture, PU flower pots, PU photo frames, and PU Roman columns. The release agent is effective and the product is very easy to clean and convenient to paint. Polyurethane molding manufacturing applicable external type release agent, mainly used for hard foam and semi-hard foam production lines. Applicable with mold temperature 30~80℃.
Product Index
| Appearance | Milky white liquid |
| Scent | No special odor |
| Density | 0.8 |
| Applicable temperature | 30℃-80℃ |
| Viscosity | 35 |
| Flash point | ＞120℃ |
| PH value | Neutral |
Product Features
- Extremely easy to use and efficient release properties.
- Excellent adhesion, and excellent thermal stability.
Storage and handling methods
Keep containers tightly sealed to prevent solvent evaporation, and store ingredients at 20-38°C to ensure the best results and avoid freezing.
Water-Based Mold Release Agent
Product Description
PU water-based mold release agent is non-toxic, environmentally friendly, has good dispersion, is easy to spray, has good mold release performance, and good weather ability, no corrosion on the mold surface, no dirt whitening phenomenon, easy to clean, and other advantages.
Product Index
| Appearance | Milky white liquid |
| Scent | No irritating odor |
| Density | 0.97 |
| Viscosity | 38 |
| PH value | Neutral |
| Operating temperature | 0℃-250℃ |
| Demoulding force | N/100cm²≤40 |
Product Features
- Non-toxic, environmental protection, harmless to the human body.
- Excellent lower sole-release molding.
- Good post-processing, adhesion, and playability.
Storage and handling methods
Stored in original airtight containers at 0℃~35℃.
High Resilience Mold Release Agent
Product Description
PU high resilience release agent is compounded by a variety of waxes, and high solid content, mainly used for car cushions, headrests, toys, and other PU resilient product parts, especially suitable for 30-55 ℃ cold-ripening foam.
Product Index
| Appearance | Milky white liquid |
| Scent | No special odor |
| Density | Approx. 0.82 g/cm3 |
| Solid content | 30% |
| Viscosity | Approx. 10-20cSt |
| PH value | 7 |
| Operating temperature | 10℃-180℃ |
Product Features
- No harmful solvents and heavy metal substances, such as alkyl phenols, amines, plasticizers, mercury, cadmium, and lead, reduce the evaporation of harmful gases during use.
- The very slight build-up of release agent in the mold.
- Superior mold release performance at low and medium temperatures, with the best effect when used at 30-60℃.
- It can be operated by brushing, rubbing, spraying, and so on. when used.
- Can be used solvent dilution 1:13-15 before use, according to the size of the gun aperture and reasonable choice of dilution times.
Storage and handling methods
Stored in original airtight containers at 2℃~30℃.
Slow Rebound Mold Release Agent
Product Description
PU slow rebound release agent is a series of highly efficient waxing PU products release agents produced by a special process. It has good leveling and adhesion on the surface of the hot mold, good film-forming performance, is easy to use, good release effect, remarkable work efficiency, and economic efficiency. The slow rebound release agent can be used for slow rebound sponges, such as memory sponges, and slow rebound pillow mold releases.
Product Index
| Appearance | Milky white sticky object |
| Scent | No special odor |
| Density | 0.72±0.01g/ml at 500℃ |
| Solid content | ＞16.5%(Drying at 1400℃ for 35 minutes at constant temperature) |
| Viscosity | The viscosity of 10±0.5 sec (diluted 10 times) |
| Grain size | <5um |
| PH value | Neutral |
Product Features
- Resistant to chemical leaching, heat, abrasion, and stretching.
- Good stripping continuity and no contamination of the mold.
Storage and handling methods
Keep the container tightly sealed to prevent solvent evaporation, and store the ingredients at 20-38°C to ensure the best results and avoid freezing. When used correctly, this product has a low procedural hazard. Shelf life is about 12 months.
Insulation Board Release Agent
Product Description
The main component of PU insulation board mold release agent is polydimethylsiloxane, which has excellent thermal and chemical stability, excellent effect of mold release and isolation, no corrosion of mold, no residual decomposition material on the surface of the mold, smooth and beautiful appearance of products, does not affect the adhesion and paint force of products, and does not pollute the mold. Suitable for: polyurethane insulation board, cold storage board, various polyurethane hard foam products, anti-wood hard foam products, toys, handicraft products of mold release.
Product Index
| Appearance | Colorless or light yellow transparent liquid |
| Scent | No special odor |
| Density | 0.82-0.85 |
| Applicable temperature | 0℃-200℃ |
| Viscosity | 100–200（mPa.s／25℃） |
| Flash Point | ＞250℃ |
| Diluent | Aromatic, aliphatic, and chlorinated hydrocarbons, petroleum solvents |
Product Features
- Excellent thermal and chemical stability.
- Excellent molding and isolation effect, no corrosion of molds.
- No residual decomposition material on the mold surface, and the smooth and beautiful appearance of the products, does not affect the adhesion and paint force of products and does not pollute the mold.
Storage and handling methods
In sealed storage, the temperature of the warehouse requires more than 0℃, less than 40℃. In the case of sealed storage, the products have a shelf life of 12 months from the date of production, and products beyond the shelf life can continue to be used if they meet the standards after application tests.
Elastomer Mold Release Agent
Product Description
The main component of PU elastomer mold release agent is the mixture of silicone and Teflon, which has excellent thermal and chemical stability, excellent mold release and isolation effect, no corrosion of the mold, no residual decomposition material on the surface of the mold, smooth and beautiful appearance of the products, does not affect the adhesion of the products and the force of the paint and does not pollute the mold. Mainly used in polyurethane elastomer products, PU rubber rollers, and PU seals.
Product Index
| Appearance | Colorless or light yellow transparent liquid |
| Scent | No special odor |
| Density | 0.98 |
| Applicable temperature | 0℃-200℃ |
| Viscosity | 100–200（mPa.s／25℃） |
| Flash Point | ＞250℃ |
| Diluent | Aromatic, aliphatic, and chlorinated hydrocarbons, petroleum solvents |
Product Features
- Excellent thermal and chemical stability.
- Excellent molding and isolation effect, no corrosion of molds.
- No residual decomposition material on the mold surface, and the smooth and beautiful appearance of the products, does not affect the adhesion and paint force of products and does not pollute the mold.
Storage and handling methods
In sealed storage, the temperature of the warehouse requires more than 0℃, less than 40℃. In the case of sealed storage, the shelf life of the product is 12 months from the date of production, and the product beyond the shelf life can continue to be used if it meets the standard by application test.
Self-Crusting Release Agent
Product Description
PU self-crusting oil-based release agent emulsion is a non-ionic emulsion of fluorine-modified methyl siloxane resin. It is mainly used for automotive self-crusting matte products, automotive interior dashboards, armrests, steering wheels, and more.
Product Index
| Appearance | Milky white liquid |
| Scent | No special odor |
| Density | 0.8 |
| Solid content | 20% |
| Type of emulsifier | Nonionic |
| PH value | 7 |
| Diluent | White power oil/gasoline |
Product Features
- Environmentally friendly and healthy, with no strong odor when the high temperature.
- Excellent demolding performance, no accumulation in the mold.
- Smooth product crust, does not affect post-processing.
- High dilution ratio, good economic performance.
Storage and handling methods
Store in the original airtight container at 2℃~30℃, and must be stirred well before use.
Dual-Density Mold Release Agent
Product Description
PU double-density release agent, widely used for releasing polyurethane from double-density shoe soles, features a dry, matte surface that is easily detached from the mold. It also provides excellent adhesion between the two layers of polyurethane. Only a small amount is required for application, and only a minimal amount of residue is left in the mold.
Product Index
| Appearance | Clear liquid |
| Scent | No special odor |
| Density | 0.79 |
| Operating temperature | 0℃-250℃ |
| Viscosity | 26 |
| PH value | Neutral |
Product Features
- Non-toxic, environmental protection, harmless to the human body.
- Excellent demolding performance.
- The sole surface is smooth and complete.
- Easy to use and easy to operate.
- Good post-processability and cleanliness.
Storage and handling methods
Keep the container tightly sealed to prevent solvent evaporation and store the ingredients in the original drum in a dry cool manner to ensure the best results and avoid freezing. When used correctly, this product has a low procedural hazard. Shelf life is approximately 12 months.
This is the introduction of the release agent commonly used in the production of polyurethane products, follow us for more production advice.
Specialized Mold Release Agent Classification
Polyurethane mold release agents are mainly divided into two types: external and internal release agents.
Polyurethane External Release Agent
A layer of coating applied to the surface of the mold so that the product can be easily removed from the mold during the molding process is called an external release agent. There are three types of external mold release agents depending on how they are applied: durable, hydroxyl-coated, and multilayer composite.
Polyurethane Internal Release Agent
The internal release agent is added to the PU formulation and migrates to the interface between the foam and the mold during each molding session to achieve the release effect. The requirements for the internal release agent are: easy to be dispersed in the resin system to become a stable dispersion, do not change the original reactivity and physical properties, do not affect the nucleation effect, so as not to change the porous structure or foam stability, do not affect the molding of the paintability.
Conclusion
This article focuses on 10 commonly used polyurethane mold release agents, each of which has different characteristics and applications. We are a professional manufacturer of polyurethane products and support wholesale and customization. Anyone who is interested can contact us at any time.
