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This is particularly useful for repairing and restoring damaged structures, as it allows for the effective bonding of new materials to existing substrates This is particularly useful for repairing and restoring damaged structures, as it allows for the effective bonding of new materials to existing substrateslatex bonding agent.
Hydroxypropyl methyl cellulose (E 464) is identified with the single Chemical Abstracts Service (CAS) number 9004-65-3, and the European Inventory of Existing Chemical Substances (EINECS) number 232-674-9. It is manufactured reacting partially depolymerised cellulose with methyl groups and containing a small degree of hydroxypropyl substitution (Figure 11). Since cellulose is a high molecular weight linear polysaccharide of indeterminate mass and its degree of substitution will depend on the conditions of manufacture, a unique mass and structure cannot be specified. HPMC is in the form of white to off-white powder. A generalised structure of HPMC is shown in Figure 11