1．塑料管帽的外觀鑒別：通過觀察塑料的外觀，可初步鑒別出塑料制品所屬大類：熱塑性塑料，熱固性塑料或彈性體。一般熱塑性塑料有結晶和無定形兩類。結晶性塑料外觀呈半透明，乳濁狀或不透明，只有在薄膜狀態呈透明狀，硬度從柔軟到角質。無定形一般為無色，在不加添加劑時為全透明，硬度從硬于角質橡膠狀（此時常加有增塑劑等添加劑）。熱固性塑料通常含有填且不透料明，如不含填料時為透明。彈性體具橡膠狀手感，有一定的拉伸率。

    2．塑(su)料(liao)管(guan)帽的溶(rong)(rong)(rong)(rong)(rong)劑處理鑒別(bie)：熱(re)塑(su)性塑(su)料(liao)在溶(rong)(rong)(rong)(rong)(rong)劑中會(hui)發生(sheng)溶(rong)(rong)(rong)(rong)(rong)脹(zhang)，但一般不(bu)(bu)溶(rong)(rong)(rong)(rong)(rong)于(yu)冷溶(rong)(rong)(rong)(rong)(rong)劑。在熱(re)溶(rong)(rong)(rong)(rong)(rong)劑中，有些熱(re)塑(su)性塑(su)料(liao)會(hui)發生(sheng)溶(rong)(rong)(rong)(rong)(rong)解，如(ru)聚乙(yi)烯溶(rong)(rong)(rong)(rong)(rong)于(yu)二甲苯中，熱(re)固(gu)性塑(su)料(liao)在溶(rong)(rong)(rong)(rong)(rong)劑中不(bu)(bu)溶(rong)(rong)(rong)(rong)(rong)，一般也不(bu)(bu)發生(sheng)溶(rong)(rong)(rong)(rong)(rong)脹(zhang)或(huo)僅(jin)輕(qing)微溶(rong)(rong)(rong)(rong)(rong)脹(zhang)，彈性體不(bu)(bu)溶(rong)(rong)(rong)(rong)(rong)于(yu)溶(rong)(rong)(rong)(rong)(rong)劑，但通常會(hui)發生(sheng)溶(rong)(rong)(rong)(rong)(rong)脹(zhang)。

      3．塑料(liao)管帽(mao)的(de)(de)密度(du)(du)鑒別(bie)塑料(liao)的(de)(de)品種不(bu)同(tong)，其(qi)密度(du)(du)也(ye)不(bu)同(tong)，可利用(yong)測定(ding)密度(du)(du)的(de)(de)方法來鑒別(bie)塑料(liao)；但此時應(ying)將發泡制品分別(bie)出來，因為發泡沫塑料(liao)的(de)(de)密度(du)(du)不(bu)是(shi)材料(liao)的(de)(de)真正(zheng)的(de)(de)密度(du)(du)。在實際工業(ye)上，也(ye)有(you)利用(yong)塑料(liao)的(de)(de)密度(du)(du)不(bu)同(tong)來分選塑料(liao)的(de)(de)。