Phenol-formaldehyde compressed wood

Phenol-Formaldehyde Compressed Wood Composite (Com-preg). This composite is similar to Impreg in that the veneer, green... 

Compreg Compressed wood- phenolic-formaldehyde composite Wood soaked in water or alcohol solution of P-F, dried, heated, and compressed during polymerization cell structure collapsed, density 1.3-1.4, ASE about 95 % resistant to decay strength, hardness, and abrasion increased Cutlery handles, electrical insulators, thin veneers... 

Compressed wood-phenolic-formaldehyde composite. Dried treated wood compressed during curing to collapse cell structure Density 1.3 to 1.4. ASE about 95%... 

Phenolic plastics. Collective designation for phenolic resin-based plastics. Phenolic resins are produced by condensation of phenol and/or its homologues, such as cresol, with an aldehyde, such as formaldehyde or with an aldehyde-releasing material such as hexamethylenetetramine. Phenol/formaldehyde and/or cresol/formaldehyde resins are used as binding materials in fibre board, laminated paper and fabrics. In phenolic moulding compounds, the proportion of filler (such as wood flour, rock flour, asbestos, stone powder, mica, glass fibre) can be equal to that of the resin. These thermosets can be processed by compression or injection moulding into black or dark-coloured products mainly for the electric industry. 

Tests with composite wood products have also yielded certain volatiles of different preservatives, in addition to formaldehyde. These can be different volatile solvents or free monomers and plasticisers or from coatings applied to them, as well as from the adhesives. The latter are commonly phenol- or formaldehyde-based and they are used in the manufacture of compressed fibre, composite board and plywood materials. As far as the coatings are concerned, some products that are sealed with a polymeric film or coating that can trap residual volatiles and allow a slow gradual release of VOC over a period of time). The binding agents used in particle board and plywood can contain volatile phenols and traces of residual solvents. 

Phenolic and other formaldehyde condensation polymers are also important reactive adhesives. Powdered phenolic resin is mixed with abrasive grains and the mixture is compression molded to form grinding wheels. A B-stage phenolic (Chapter XX) in a solvent is used to impregnate tissue paper. The solvent is evaporated, and the dry sheets are placed between layers of wood in a heated press, where the resin first melts and then cures, bonding the wood to form plywood. Similarly, sheets of paper impregnated with a B-stage melamine-formaldehyde resin are laminated and cured to form the familiar Formica counter tops. 

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