在物理力学性质指标中成熟材的基本密度、气干密度、顺纹抗压强度、抗弯强度、抗弯弹性模量及冲击韧性高于幼龄材；
In physical and mechanical indexes, the basic density, air-dried density, compression strength parallel to grain, MOR, MOE and toughness of mature wood are higher than that of juvenile wood.
加入BGE后，材料的冲击强度提高，但是压缩强度和模量减小。
Similarly, adding BGE also conduced to the improvement of impact strength and slight decrease in compressive strength and modulus.
若控制合金中乙丙共聚物的含量不超过10%，则可使PP合金材料既具有较高的冲击强度又具有较高的模量。
However, in case the content of EP copolymer was controlled at not higher than 10%, then the PP alloy would possess not only the high impact strength but also the flexural module.
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