Marmag Magnesium oxide C. P. Hall Acid Absorber / Acceptor Chloroprene Rubber (CR) ADHESIVE MARMAG has slightly lower activity than Maglite D and is well suited for non-critical applications involving polychloroprene-based elastomers and adhesives. Magnesium oxide. Used as acid absorber. Suits for non-critical applications involving polychloroprene-based adhesives.