<b>QB -40H</b> by <b>Longhui Qunfeng Chemical Company</b> is a polyvinyl butyral resin (PVB). It is a white colored powder. <b>QB -40H</b> by <b>Longhui Qunfeng Chemical Company</b> is designed for use in special adhesives.
<b>QB -20H</b> by <b>Longhui Qunfeng Chemical Company</b> is a polyvinyl butyral resin (PVB). It is a white colored powder. <b>QB -20H</b> by <b>Longhui Qunfeng Chemical Company</b> is used in special adhesives.
