114鋼管塑料管帽滄州直銷

1. 塑料的外觀鑒別(bie)

　　通過(guo)觀(guan)察塑(su)(su)(su)(su)料(liao)(liao)的(de)外觀(guan)，可初(chu)步鑒別(bie)出塑(su)(su)(su)(su)料(liao)(liao)制品所屬大類：熱(re)塑(su)(su)(su)(su)性塑(su)(su)(su)(su)料(liao)(liao)，熱(re)固性塑(su)(su)(su)(su)料(liao)(liao)或(huo)彈(dan)(dan)性體。一(yi)般熱(re)塑(su)(su)(su)(su)性塑(su)(su)(su)(su)料(liao)(liao)有(you)(you)結晶(jing)和無定(ding)形(xing)兩類。結晶(jing)性塑(su)(su)(su)(su)料(liao)(liao)外觀(guan)呈(cheng)半透(tou)(tou)(tou)(tou)明(ming)(ming)，乳濁狀(zhuang)或(huo)不(bu)透(tou)(tou)(tou)(tou)明(ming)(ming)，只(zhi)有(you)(you)在薄膜狀(zhuang)態呈(cheng)透(tou)(tou)(tou)(tou)明(ming)(ming)狀(zhuang)，硬度(du)從(cong)柔軟到角質。無定(ding)形(xing)一(yi)般為無色，在不(bu)加(jia)添(tian)加(jia)劑時(shi)(shi)為全透(tou)(tou)(tou)(tou)明(ming)(ming)，硬度(du)從(cong)硬于角質橡(xiang)(xiang)膠狀(zhuang)(此時(shi)(shi)常加(jia)有(you)(you)增塑(su)(su)(su)(su)劑等添(tian)加(jia)劑)。熱(re)固性塑(su)(su)(su)(su)料(liao)(liao)通常含(han)有(you)(you)填(tian)且不(bu)透(tou)(tou)(tou)(tou)料(liao)(liao)明(ming)(ming)，如不(bu)含(han)填(tian)料(liao)(liao)時(shi)(shi)為透(tou)(tou)(tou)(tou)明(ming)(ming)。彈(dan)(dan)性體具橡(xiang)(xiang)膠狀(zhuang)手感，有(you)(you)一(yi)定(ding)的(de)拉伸率(lv)。

　　2. 塑料的溶劑處理鑒別(bie)

　　熱(re)塑(su)(su)性(xing)(xing)塑(su)(su)料(liao)在(zai)溶(rong)(rong)(rong)劑(ji)中會發(fa)生溶(rong)(rong)(rong)脹(zhang)(zhang)，但一般不(bu)溶(rong)(rong)(rong)于冷溶(rong)(rong)(rong)劑(ji)。在(zai)熱(re)溶(rong)(rong)(rong)劑(ji)中，有(you)些熱(re)塑(su)(su)性(xing)(xing)塑(su)(su)料(liao)會發(fa)生溶(rong)(rong)(rong)解，如聚乙烯溶(rong)(rong)(rong)于二甲苯中，熱(re)固性(xing)(xing)塑(su)(su)料(liao)在(zai)溶(rong)(rong)(rong)劑(ji)中不(bu)溶(rong)(rong)(rong)，一般也(ye)不(bu)發(fa)生溶(rong)(rong)(rong)脹(zhang)(zhang)或僅輕微(wei)溶(rong)(rong)(rong)脹(zhang)(zhang)，彈性(xing)(xing)體不(bu)溶(rong)(rong)(rong)于溶(rong)(rong)(rong)劑(ji)，但通常(chang)會發(fa)生溶(rong)(rong)(rong)脹(zhang)(zhang)。

　　3. 塑(su)料的密(mi)度鑒別。

　　塑料的品種不同，其密度也不同，可利用測定密度的方法來鑒別塑料;但此時應將發泡制品分別出來，因為發泡沫塑料的密度不是材料的真正的密度。在實際工業上，也有利用塑料的密度不同來分選塑料的114鋼管塑料管帽滄州直銷不銹鋼管帽英文（Stainless steel caps）又稱堵頭或封頭。 用途：焊接在管端或裝在管端外螺紋上以蓋堵管子的管件。用來封閉管路，作用與堵頭相同。
管帽包括凸形管帽、錐殼、變徑段、平蓋及緊縮口的設計。
凸形(xing)管帽(mao)(mao)包括：半球(qiu)形(xing)管帽(mao)(mao)、橢圓形(xing)管帽(mao)(mao)、碟形(xing)管帽(mao)(mao)和球(qiu)冠形(xing)管帽(mao)(mao)。從受(shou)力角度(du)(du)看(kan)凸形(xing)管帽(mao)(mao)中從半球(qiu)形(xing)管帽(mao)(mao)逐(zhu)(zhu)漸(jian)不好，但從制造難度(du)(du)上看(kan)，逐(zhu)(zhu)漸(jian)好制造。