Geofoam Applications in the Design and Construction of Highway Embankments (2004) / Chapter Skim
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E- 2 APPENDIX E GLOSSARY OF TERMS Block Molding is the second step in the two-step manufacturing process of EPS-block geofoam whereby the pre-puff is placed into a mold which is essentially a closed steel box that is rectangular in shape and steam is injected into the sealed mold to resoften the polystyrene and further expand the pre-puff causing the pre-puff to fuse thermally. Blowing Agent is the naturally occurring petroleum hydrocarbon, almost always pentane (Japan is the only known country where an alternative, butane, is used routinely)
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E- 3 pentane (Japan is the only known country where an alternative, butane, is used routinely) , mixed in as a blowing agent.
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E- 4 Molder is the manufacturer of expanded polystyrene blocks that buys the expandable polystyrene and, in a multi-stage process, transforms it into expanded polystyrene block. Oxygen Index (OI)
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E- 5 that is condensed steam from molding remains in the block at the end of molding. Seasoning is also referred to as aging and conditioning in the EPS industry.
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