3工程塑料：门体主要塑料件（如管材与管材间的连接，塑料件，门体活动部件等等）采用高质量工程塑料（如PC PA韧性高，耐冲击,抗扭曲，耐磨，耐冻，耐晒，不易老化，使用寿命长，免受风雪雷电、日晒雨淋之苦。
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PBT is a thermoplastic engineering plastic with good properties, it is called the five general engineering plastic with PPO, PC, POM and PA.
聚对苯二甲酸丁二醇酯（PBT）是一种性能优良的热塑性工程塑料，它与PPO、PC、POM和PA共称为五大通用工程塑料。
Taking the Balda camera as an example, the article introduces the application of such engineering plastics as PC, POM, ABS, PBT, PA in the camera and their technical characteristics.
以巴尔达照相机为例，分析介绍了PC、POM、ABS、PBT、PA等工程塑料在照相机中的应用情况和技术特点。
II. . Reasons and conditions: PC is the only engineering plastics with good transparency. By far, the total consumption volume of PC has surpassed PA, becoming No. 1 engineering plastics.
项目建设理由和条件：聚碳酸酸（PC）是工程塑料中唯一具有良好透明性的品种，总消费量在工程塑料中已经超过聚酰胺，而越居工程塑料之首。
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