タイトルまたは説明

GUM ROSIN(Naval stores )are the derivatives of the crude gum—oleoresin—that comes from living pine trees, In the trade, the product from living pine trees is known as gum naval stores; the product from stumps, lightwood, and pulp mills is called wood naval stores. In Colonial days, gum was cooked down to a thick tar and used to preserve the ropes and calk the seams of the ships—and from that we got the name "naval stores" for the products used now in a hundred ways unconnected with ships. The gum naval stores Name of index X WW WG Color Slight yellow Light yellow Yellow Appearance Transparent Transparent Transparent Softening point(R&B)℃ ≥ *6 *6 *5 Acid Value(mg KOH/g) ≥ **6 **6 **5 Unsaponifiable matter content﹪ ≤ 5% 5% 5% Insolubies in ethanol ≤ 0.*3 0.*3 0.*3 Ash content ≤ 0.*2 0.*2 0.*3