日本住友化学PMMAHT09X--2004年住友与香港中骏集团属下的中骏重工(厦门)有限公司在原来厂家与代理长期合作、互相信任的基础上，为扩大市场占有率，提高住友品牌的知名度与售后服务的力度，在中国成立了合资公司—住重中骏（厦门）建机有限公司。很遗憾正好遇上中国的宏观调控，使得2004年住友在中国市场的销售情况并没有达到预期目标。但住重中骏正好利用这段时间，完善了代理商网络以及售后服务网络建设。2005年住重中骏再度发力，售出了所有的库存机器，大部分机型都出现了供不应求。2006年在快速发展的基础上扩大市场占有率，2007年再创佳绩，销售台量同比增长了50%，创下历史新高
The density of PMMA is generally between 1140-1180 kg / m3, halfof that of glass;
The melting point of PMMA is low: the melting point of PMMA isabout 129-141c, which is much lower than the high temperature ofglass about 1000 ℃.
The weight of PMMA is relatively light: the density of PMMA is1.18g/cm3, and the weight of PMMA with the same size is only 45% ofthat of half metal aluminum of ordinary glass.
The mechanical strength of PMMA is relatively high: the relativemolecular weight of PMMA is about 1.99 million, which is a longchain polymer compound, and the chain forming the molecule is verysoft. Therefore, the strength of PMMA is relatively high, and itstensile and impact resistance is 8-19 times higher than that ofordinary glass. There is a kind of plexiglass which has been heatedand stretched. The molecular segments of the plexiglass arearranged in a very orderly way, which greatly improves thetoughness of the material.
In 1937, the industrial manufacturing and development of methylacid ester was successful, which led to large-scale manufacturing.During the Second World War, because of its good toughness andlight transmittance, acrylic was first widely used in thewindscreens of aircraft and the field of vision of the tankdriver's cab. In 1948, the world's first PMMA bathtub was born, andthe application of PMMA entered a new milestone.
