| http://www.w3.org/ns/prov#value | - A composition of claim 3 wherein the temporarily water-impermeable solid-material jacket of the thawing agent is a crosslinked phenolic resin prepared by acidic condensation of a phenolic compound with formaldehyde, wherein the molar ratio of the phenolic compound to formaldehyde is situated within the range of from 1:0.2 to 1:0.4.
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