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Related to steam blow: blow off steam
steam blow[′stēm ‚blō]
1. A roughly circular or elongated unbonded area between plies of laminated constructions, as in wood veneer. Usually caused by entrapped moisture. Also called steam blow.
2. A spongy raised portion of a roofing membrane, where separation of the felts has occurred or the membrane is not bonded to the substrate as a result of the expansion of water and air trapped in the membrane.
3. A raised spot on the surface of the metal caused by expansion of gas in a sub-surface zone during thermal treatment.
4. A raised area on the surface of a molded plastic caused by the pressure of internal gases on its incompletely hardened surface.
5. See blistering
6. A convex, raised area on the surface of a pipe which indicates an internal separation.