Pre-catalyst urea glue has been used to describe glues which are mixture of powder hardener and a powder resin. You know that urea formaldehyde adhesive also can be provide in powder form. Such a mixture can have an adequate storage-like provide the moisture content is low. Among hardening agents claimed to give satisfactory storage-life are ammonium salts of non-volatile acids, and aluminum sulfate.
Although these glues lack the flexibility of usage which separate hardener bestow, they have the advantage that they can be made ready for use simply by adding water. When they have been dissolved in water, the pre-catalyst urea glues have the same pot-life as if the hardener were added by the user, there is no latent hardening effect.
More about Incorporation Hardener
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