| 摘要 |
Disclosed are films made of expanded polypropylene, which have a uniform specific gravity d of from about 4.25x10-6 to about 6.50x10-6 Newton/mm3, a crystallization temperature of from about 115 DEG C. to about 135 DEG C. and an elastic modulus Me expressed in Newton/mm3 such that the ratio Me:d is from about 1.6x108 to about 2.0x108 mm.
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