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Product Description
Novolac Epoxy Resin 638 is prepared by polycondensation reaction between phenol and formaldehyde in acidic medium to obtain linear phenolic resin, and then polycondensation reaction with excess propylene oxide in the presence of sodium hydroxide.
Technical Specifications
Appearance |
Yellowish, Transparent, Semi-solid |
Color ，G |
0-1 |
Viscosity, mPa.S |
H-K |
Epoxy Equivalent, g/eq |
172-182 |
Inorganic chlorine (ppm) |
≤5 |
Hydrolyzed Chlorine (%) |
≤ 0.03 |
Volatile Content (%) |
≤0.1 |
Features
• High viscosity
• High temperature resistance
• Chemical resistance
• Good adhesion strength
• High mechanical strength
Applications
• Heat resistant adhesives
• Heat resistant Coatings
• Laminates
• Composite
• PCB inks
• Potting and Encapsulation
Storage & Packaging
Stored in a cool and dry place with ventilation and can be sealed for 12 months.
Package:220kg in iron drum.
