B 4500 PBT德国巴斯夫产品介绍：适中黏度级别，用以生产制造压挤铸膜、厚壁铝型材和管路。
1970 年美国Celanese 企业先将之走向市场，初产品名叫X-917，够称之为CELEX。之后，伊斯曼企业，GE 企业及其法国的巴斯夫公司也陆续资金投入生产制造。PBT 具备优质的终合特性，自1970 年诞生至今，获得了短时间的发展趋势，在五大工程塑料中，PBT 的年平均增长率是大的，1993 年全球生产量已抵达28.2 万吨级。伴随着生产工艺的不断进步和健全，新的运用的销售市场的开发设计，预估将来PBT的生产制造仍可能以较高的速率提高。
In 1970, Celanese enterprises in the United States first broughtit to the market. The initial product was called x-917, which isenough to be called celex. After that, Eastman enterprises, Geenterprises and BASF of France also successively invested inproduction and manufacturing. PBT has high- final closingcharacteristics. Since its birth in 1970, it has obtained ashort-term development trend. Among the five engineering plastics,the annual average growth rate of PBT is the largest. In 1993, theglobal production reached 282000 tons. With the continuous progressand improvement of the production process and the development anddesign of the new sales market, it is estimated that the productionand manufacturing of PBT may still be improved at a high rate inthe future.
B 4500 机械性能：
额定电流 单位制 测试标准
相对密度 1.30 g/cm³ ISO 1183
堆积密度 0.70 到 0.80 g/cm³
融化容积流率（MVR） (250°C/2.16 kg) 21.0 cm³/10min ISO 1133
缩水率 ISO 294-4
竖直流动性方位 1.9 % ISO 294-4
流动性方位 1.6 % ISO 294-4
吸水性 ISO 62
饱和状态, 23°C 0.50 % ISO 62
均衡, 23°C, 50% RH 0.25 % ISO 62
粘数 1 130 cm³/g ISO 307
模貝收拢性 2
free, longitudinal 1.5 %
free, transverse 1.5 %
