<em id="p7dp9"></em>

            <address id="p7dp9"><nobr id="p7dp9"></nobr></address>

                  <form id="p7dp9"></form><em id="p7dp9"></em>

                    <form id="p7dp9"></form>

                    <form id="p7dp9"></form>
                    <form id="p7dp9"></form>

                    中文|EnglishHello! Welcome to Dongguan Hengdian Electronics Co., Ltd website!!

                    Contact us

                    Dongguan Hengdian Electronics Co., Ltd

                    Phone :0769-87310008

                    Tel :0769-87310008

                    Fax :0769-87893009

                    E-mail :dg_hddz@yeah.net

                    Address :6 lijiu Road, Dali Village, Qingxi Town, Guangdong Province

                    News

                    Current location:Home > News >

                    Selection of plastic materials

                    View:409 Adddate:2021-6-2

                    So far, there are more than ten thousand resin species reported, and no less than 1000 have been produced in industrialization. The selection of plastic materials is to choose a suitable variety among many resin varieties. At first, we can choose too many plastic varieties, there is a dazzling feeling. But in fact, not all resin varieties have been used in practice. The choice of plastic materials we refer to is not an endless choice, but in the common resin varieties.

                    Selection principle of plastic materials:

                    1、 Adaptability of plastic materials; 1. comparison of properties of various materials; 2. conditions for unsuitable use of plastics; 3. suitable conditions for plastic selection.

                    2、 The use performance of plastic products 1. the conditions of use of plastic products a. the stress of plastic products; b. Electrical properties of plastic products; c. Dimensional accuracy requirements for plastic products; d. Permeability requirements for plastic products; e. Requirements for transparency of plastic products; f. Appearance requirements for plastic products. 2. the environment of plastic products A. ambient temperature; b. Environmental humidity; c. Contact medium; d. Light, oxygen and radiation of the environment

                    3、 The processability of plastics 1. processability of plastics; 2. processing cost of plastics; 3. waste materials for plastic processing

                    4、 The cost of plastic products 1. The price of plastic raw materials; 2. service life of plastic products; 3. maintenance cost of plastic products. 5. Source of plastic raw materials. In the actual selection process, some resins are very close in performance and difficult to distinguish between them.



                    Previous article : None
                    bl辣文| 松岛枫无码| 真实夫妇中年屋里自拍视频| 粉色视频在线| 波多野结衣作品番号| 97在线观看视频| 老熟妇色XXXX老妇多毛| 美女艳照| 特级超大BBWBBBWBBBW| 1313久久国产午夜精品理论片| 日本动漫片爆乳h动漫无遮挡尤物| 日本性爱| 啊灬啊别停灬用力小建韵云| 欧美疯狂性受XXXXX喷水更猛| 在线观看免费av网站| 丫鬟的艳史H| 欧美多人性战交疯狂派对| 浓毛老太BBWBBWBBWBBW看| 人与动物杂交| YIN荡受各种PLAY合集双性| 性饥渴老太XXXXXHD| 欧美 肠交 扩张 另类| 波多野结衣作品番号| 国产成人久久精品毛片| 97精品国产自产在线观看永久| 美女的b| 奶头被民工吸的又大又黑| 下载黄色小说| av女同| 被H系统改造成校花被H| 攵女乱H系列合集多女| 壮熊gv| anysex| 国产人做人午夜免费视频| 淫声| 无码无遮挡H肉动漫在线观看| 黑人狂躁日本妞videos| av动态图| AV漫画羞羞漫画在线入口| 丰满少妇被猛烈进入播放视频| 和上司交换娇妻在线播放| 搡老熟女国产L| 娇小BBW搡BBBB搡BBBB| 国产午夜福利片| japanese jizz| 外国黄色网站| 北京熟女|