Basic information on adhesives with magnesium oxide

　　Basic requirements:

　　It is generally divided into two types: magnesium oxide for laminating and magnesium oxide for direct injection. Magnesium oxide for laminating is large in volume, good dispersion, moderate activity and non-stick roller. Activity is better in 80-120. Direct use of magnesium oxide requires the activity to be between 120-150 is better, the apparent specific capacity is about 5 is better, and both magnesium oxides require the lower the calcium and iron content, the better.

　　Common quality issues:

　　Magnesium oxide content is too low to produce white suspended solids; The calcium content in magnesium oxide is too high, the activity is too poor, the fineness is not enough, it is easy to produce precipitation, and the phenomenon of delamination: if a thin layer of white sediment is produced at the bottom of the adhesive container, it is normal; If too much is abnormal, it is a problem with magnesium oxide, or it may be a problem with talc in neoprene gum; If there is too much, it is not a problem with magnesium oxide, it may be a resin or solvent problem; Iron content is too high, easy to make the glue discolored and red, the general iron content can not be higher than 0.05 (preferably below 0.03); If it is slightly red or pink, it may be a problem with magnesium oxide or it may be a problem with neoprene; If it is dark red, pig blood red, and dark red, it is not a magnesium oxide problem, and generally speaks of a problem with the solvent and resin.