Product Details
CasNo： 7631-86-9
MF： SiO2
Appearance： liquid
Delivery Time： 15 days
Packing： 25kg/drum
Purity： 99%
Basic Product Information
- Chemical Composition: Defoaming polymer solution, free of organosilicon.
- Packaging Specifications: Commonly 25 kg/blue iron drum, 25 kg/drum, and also 170 kg/blue iron drum packaging.
- Shelf Life: When stored in the original unopened packaging under specified conditions, the shelf life is 60 months.
Typical Physicochemical Data
- Appearance: Light yellow liquid.
- Odor: Aromatic.
- Melting Point: Below 0°C.
- Initial Boiling Point: 160°C.
- Flash Point: 43°C.
- Explosion Limit: Upper limit 7.50 % (V), lower limit 1.00 % (V).
- Vapor Pressure: 5.0000000 hPa (20°C).
- Density: 0.8800 g/cm³ (20°C).
- Water Solubility: Immiscible.
- Autoignition Temperature: Greater than 200°C.
- Kinematic Viscosity: 27.000 mm²/s (20°C), 21.500 mm²/s (40°C).
- Refractive Index (20°C): 1.507.
- Color Value: Less than 250.
- Turbidity: Less than 10 TE/F.
- Non - volatile Content: 38%.
Features and Advantages
- Efficient Defoaming: Shows high defoaming efficiency in almost all processing methods of various unsaturated polyester resins.
- Component Safety: It is a polymer - type defoamer without organosilicon, avoiding problems that organosilicon may bring.
- Wide Application: Suitable for various unsaturated polyester resins and processing methods, such as hand lay - up, spray - up, filament winding, gel coat, casting, etc. It is especially suitable for the pultrusion process of acrylic, unsaturated polyester and vinyl ester resins, and is also applicable to epoxy systems and polyurethane systems.
- Prevent Bubbles: Can effectively prevent the entrainment of air during the plastic system, production and pultrusion process.
Application Fields
Mainly used in the field of unsaturated polyester resins, as well as the pultrusion process of acrylic and vinyl ester resins; It is also used in solvent - based and solvent - free adhesives, epoxy systems and polyurethane systems.
Recommended Dosage
- Room Temperature Curing System: 0.1 - 0.5 % (based on the total formula dosage).
- Unsaturated Polyester Resin: 0.1 - 0.5 %.
- Pultrusion Process: 0.2% with 0.3% BYK - A515 or BYK - A560.
- Acrylate: 0.2% with 0.3% BYK - A515 or BYK - A560.
- Unsaturated Polyester: 0.2% with 0.3% BYK - A515 or BYK - A560.
- Vinyl Ester Resin: 0.2% with 0.3% BYK - A515 or BYK - A560.
Addition Method and Processing Guidance
Stir BYK - A555 defoamer in the resin before adding other components to prevent air entrainment during production and construction.
Precautions
In some resin systems, this defoamer may cause fogging in finished parts. In actual use, the addition amount needs to be determined through a series of tests to find the optimal value.
