GLR-21 is a modified resorcinol formaldehyde resin. It can be used as methylene receptor to solve the problem of sublimation smoke brought by simple using resorcinol, eliminating harms to the environment and human. It can effectively lead to adhesion via reacting with methylene donor.

GLR-21 can be used as resorcinol in resorcinol-formaldehyde-silica system and leads to adhesion via reacting with methylene donor. It is widely used for the adhesion between various rubbers and textile or brass-plated steel cords or fibres. 2-5 phr of GLR-21 is suggested to be used with 2-5 phr of adhesive HMMM or other methylene donor.

GLR-21 is packed in a paper bag lined with plastic bag. The net weight per bag is 25kg.
It should be systematically stockpiled in a dry, clean and cool warehouse to avoid to be moistured, heated or deteriorated.
The valid storage is one year.