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An assortment of polyurethane foam products for cushioning and insulation. Polyurethane foam is a solid polymeric foam based on polyurethane chemistry. As a specialist synthetic material with highly diverse applications, polyurethane foams are primarily used for thermal insulation and as a cushioning material in mattresses, upholstered furniture or as seating in vehicles.
To create foam latex, a liquid latex base is mixed with various additives and whipped into a foam, then poured or injected into a mold and baked in an oven to cure.The main components of foam latex are the latex base, a foaming agent (to help it whip into a froth), a gelling agent (to convert the liquid foam into a gel), and a curing agent (to turn the gelled foam latex into a solid when baked).
A foam of higher IFD but lower density can feel soft when compressed. IFD measures the force in newtons (or pounds-force) required to make a dent 1 inch into a foam sample 500 mm × 500 mm × 100 mm (19.7 in × 19.7 in × 3.9 in) by a 323 cm 3 (50 sq in, 8-inch-diameter) disc—known as IFD @ 25% compression. [10]
The momme is based on the standard width of silk of 45 inches (1.1 m) wide (though silk is regularly produced in 55-inch (1.4 m) widths and uncommonly in larger widths). The usual range of momme weight for different weaves of silk are: Habutai—5 to 16 mm; Chiffon—6 to 8 mm (can be made in double thickness, i.e. 12 to 16 mm)
Crofton, a veteran of the upholstery trade, describes using nine circular steel coil springs 7 inches high and 3-1/2 inches wide, made of number 8 charcoal wire, for upholstering easy chairs. His book also describes spring upholstered sofas, beds, mattresses, pillows, and carriage and coach seats also made of circular coil spring of lighter ...