| 摘要 |
PROBLEM TO BE SOLVED: To provide a container for storing mechanical and electrical parts to which ultrahigh dimensional stability is required and a delivery box most suitable as a tray for an industrial robot, etc., and the like. SOLUTION: This expansion-molded product is composed of a styrenic resin foam having 0.4-0.05 bulk specific gravity, contains a residual foaming agent therein in an amount of <=3 wt.% based on the weight thereof, has -0.5 to 0% rate of dimensional change as compared with the previous state when left in an oven at 50 deg.C for 100 days and has dimensional stability. The styrenic-base resin of the foam preferably contains a polyolefin resin having a low molecular weight in an amount of 0.1-10 pts.wt. and a styrene resin having a low molecular weight in an amount of 1-30 pts.wt.
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