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Powdered Novolac Phenolic Resin With Hexamine For Grinding Wheels

Categories Novolac Phenolic Resin
Brand Name: HONINGLITE
Model Number: P2324
Place of Origin: CHINA
MOQ: 1000KGS
Price: Negotiation
Payment Terms: T/T, L/C, D/P
Supply Ability: 5000TONS PRT MONTH
Packaging Details: 25KGS BAG
Appearance: Light yellow powder
Package: 25kg bag
Melting point: 98-105℃
Gel time: 80-100 s @150℃
Flow: 50-70 mm @ 125℃
Application: Grinding Wheels
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    Powdered Novolac Phenolic Resin With Hexamine For Grinding Wheels

    Powdered Novolac Phenolic Resin with Hexamine For Grinding Wheels

    Product description

    A novolak resin (two-step) is produced by condensing phenol with an insufficient amount of formaldehyde to complete the reaction in the presence of an acid catalyst. This produces a thermoplastic resin. To cure this resin, a hardening agent is used, HMTA (or hexa). Under heat and pressure, it yields ammonia and formaldehyde as methylene groups to cure the resin, hence the term “two-step,” because of the two formaldehyde additions. A novolak phenolic resin has an infinite shelf life under normal storage conditions.


    Application


    Bonded abrasives like grinding wheels are comprised of abrasive particles embedded in a bonding matrix. While the grit used may be from a wide variety of minerals and abrasive particles, phenolic resin is the matrix binder of choice. Achieving the optimal combination of resistance to burst or fracture strength, flexibility and porosity, coupled to the manufacturing method, requires optimization of the binding resin to the specific application of the wheel in question. Modification of the blend of phenolic novolac powder, hexa, and liquid resol resin is usually needed to achieve such optimization. For increased strength, fiberglass reinforcement inlays are used. These inlays are themselves typically saturated with a special liquid phenolic resin.


    Specification:


    PropertiesValueTest standard
    Curing time @150°C90-110sGB/T24411-2009
    Flow Distance@125°C35-45mmGB/T24411-2009
    Free-phenol0.5-1.5%GB/T30773-2014
    hexa content8-10%ZJHM-QESP-01-2015
    Water content0.5-2.0%GB/T2683-2008
    Screening 200mesh/0.074mm99%GB/T24411-2009

    Packing&Storage


    the package is paper-plastics bag in 25KGS each one
    The storage life of this product is several months in a cool and dry place in original closed bags

    Buy Powdered Novolac Phenolic Resin With Hexamine For Grinding Wheels at wholesale prices
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