Factory Price Excellent Heat and Chemical Resistance Novolac Epoxy Resin Hwr 638

• Molecular Principal Chain: Heterochain Polymer
• Color: Yellowish
• Application: Coating, Adhesive, Sealant, Epoxy Flooring
• Model NO.: HWR 638
• Appearance: Clear Liquid
• Epoxy Equivalent Weight (G/EQ): 174-180
• Viscosity: H-K
• Chemical Composition: Novolac Epoxy Resin
• Transport Package: Drum
• Specification: 220KG/Drum
• Trademark: Honrel
• Origin: China
• HS Code: 3506912000
• Production Capacity: 90000tons Per Year

Product Description

Product Description

 

General description
HWR-638 is a semi-solid reaction product of epichlorohydrn and phenol-formaldehyde novolac. It has advantageous characteristics of good adhesion strength, excellent heat and chemical resistance because of its multi-functional groups in one molecule fully cross-linked. Therefore, it has excellent physical properties in addition to the basic reactivity of general Epoxy Resin.

Characteristic:                                                                         Typical applications:
• High viscosity                                                                           • Heat resistant adhesives
• High temperature resistance                                                      • Heat resistant Coatings
• Chemical resistance                                                                   • Laminates
• Good adhesion strength                                                             • Composite
• High mechanical strength                                                         • PCB inks
• Potting and Encapsulation

Typical properties:

Property	Value
Appearance	Yellowish, Transparent, Semi-solid
Epoxy equivalent (g/mol)	174-180
Color (Gardner)	≤ 1
Chloride Content (ppm)	≤5
Hydrolyzable Content (ppm)	≤300
Volatile matter (ppm)	≤500
Viscosity  ( cps,25°C)	H-K

Storage:
Novolac Epoxy Resin HWR-638 is supplied in bulk or in 220KG tight-head drums. The resin should be stored in dry place in its original closed packaging.
Shelf life is 12 months.
 

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