Colophony

Gum Rosin/Colophony/Natural Rosin/China Gum Rosin/Resin

gum rosin has been general used for ink, adhesive, paint, food and rubber industry

Name of Index	X	WW		WG	N		M	K
Color	Slight yellow	Light yellow		yellow Deep	yellow		Yellow brown	yellow red
Appearance	Transparent
Softening Point (R. & B.)	76°Cmin		75°C min			74°C min
Acid Value mg KOH/g	166 min		165 min			164 min
Unsaponifiable Matter	5%max		5%max			5%max
Insoluble Matter in Alcohol	0.03%max		0.03%max			0.04%max
Ash	0.02%max		0.03%max			0.04%max

At present, most rosin product is used for the manufacturing of paper, paint, soap and printing ink. Since rosin is easily softened and oxidized, in the oil paint industry, the carboxylation reaction of resin acid is usually employed to produce resinate for further use. While in the producing of synthetic rubber and printing ink, resin acid is changed into disproportionate rosin, polymerized rosin, hydrogenated rosin, etc for further use by its double bond reaction.

Colophony