Polyether defoamer GP-330 (CAS: 68439-50-9) is a nonionic glycerol polypropylene ether, which is distinctly different from commonly available mineral oil defoamers and silicone defoamers at the molecular structure level. Compared with mineral oil defoamers, GP-330 does not exhibit oil separation under high temperature conditions, and its temperature resistance is significantly better. Compared with general-purpose silicone defoamers, although GP-330 may be slightly slower in bubble breaking, its biggest highlight is that it is less likely to cause film defects such as shrinkage cavities and fish eyes. This is a decisive advantage in coatings, inks, and adhesives applications—silicone defoamers, if not evenly dispersed, often lead to coating surface defects, while GP-330 naturally has good system compatibility.
Within the Guoli Chemical product line, GP-330 differentiates itself from paper defoamer XS-02 (polyether ester type, CAS: 9004-81-3) and defoamer king FAG470 (polyether-modified silicone type). XS-02 is more suitable for specific processes such as papermaking, and although FAG470 combines the fast defoaming ability of silicone, GP-330 remains a safer choice in terms of system compatibility and anti-shrinkage performance. Overall, GP-330 is the most versatile and lowest-risk defoamer type in water-based systems.
| Parameter Item | Polyether Defoamer GP-330 | Typical Mineral Oil Defoamer | Typical Silicone Defoamer |
|---|---|---|---|
| Ion Type | Nonionic | Nonionic | Nonionic\/Anionic |
| HLB Value | Approx. 1 | — | — |
| Appearance | Colorless to slightly yellow transparent liquid | Light yellow to amber liquid | Milky white liquid |
| Cloud Point (1% aqueous dispersion) | ≤20°C | Not applicable | Not applicable |
| Viscosity (25°C) | 300~500 mPa·s | Depends on product | Depends on product |
| Flash Point (Open Cup) | ＞200°C | Generally ＞150°C | Generally ＞100°C |
| Temperature Resistance | Excellent, maintains defoaming activity at high temperatures | Prone to failure and oil separation at high temperatures | May demulsify or cause oil floating at high temperatures |
| Film Defect Risk | Very low, not prone to shrinkage cavities\/fish eyes | Risk of oil stains | Higher risk of shrinkage cavities |
| Chemical Stability | Resistant to acids, alkalis, and hard water | General acid and alkali resistance | Not resistant to strong alkalis |
| Freezing Point | ＜-20°C | — | — |
| Density | 0.85~1.05 | — | — |
Recommended Dosage: In various water-based systems, the recommended addition amount of GP-330 is 0.01%~0.3% of the total formula weight. The specific dosage should be determined through experiments based on the foaming degree of the system and process conditions. The liquid form facilitates measurement and addition; it can be added directly during material stirring or pre-dispersed with a small amount of water before adding.
Priority of Applicable Scenarios: