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Phenol-Formaldehyde Powder

Powder resins are mix of novolac’s resin with additives in form of powder from white to brown color.

Powder resins are high-condensed novolacs with a low free phenol content, high softening point, medium to short flow and high melt viscosity. The novolacs resins are mixed with HMTA as hardener and then finely ground. Lower HMTA content leads to less cross-linking and to softer bonds.

High HMTA content results in higher cross-link density and thereby higher hardness and for example high resistance of the grinding wheel if we talk about abrasive industry. Besides adding HMTA used various other additives conferring special properties of the final powder.

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