有机玻璃是一种具有形状记忆性的热塑性材料。
PMMA is one kind of hot plastic material with shape memory faculty.
开槽模具由具有形状相同的冲头刃、槽刃组成。
The grooving die set is composed of a punch edge and a groove edge which have the same shape.
即便饱和水蒸汽，硅胶仍具有形状外观干燥的产品，其不变。
Even when saturated with water vapor, silica gel still has the appearance of a dry product, its shape unchanged.
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