| http://www.w3.org/ns/prov#value | - Suitable water soluble or dispersible materials which are insoluble in the organic solvents used to dissolve or disperse the chemical include polyethylene oxide or methyl cellulose, but preferably the envelope, e.g. a bag or sachet, comprises or is made from polyvinyl alcohol film, i.e. partially or fully alcoholysed or hydrolysed e.g. 40-99%, preferably 70-92% alcoholysed or hydrolysed, polyvinyl
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