工業(yè)用油品：如液壓油.變壓器油.透平油.冷凍機油.潤滑油.抗燃油等在使用過程中由于種種原因會混進(jìn)去一些雜質(zhì)，主要雜質(zhì)有機械雜質(zhì).水和空氣等，這些雜質(zhì)會造成腐蝕加快，增加機械磨損，降低工作效率，使油品變壞降低設(shè)備使用壽命，嚴(yán)重時會產(chǎn)生油路堵塞造成生產(chǎn)事故。
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