幾種閥門密封圈材料的應用-資訊--格業閥門有限公司_鸭脖电竞

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幾種閥門密封圈材料的應用

發布時間:2018-01-16 16:37:40   訪問:714

NBR丁氰橡膠密封圈:适合于石油系液壓油、甘醇系液壓油、二酯系潤滑油、汽油、水、矽潤滑脂、矽油等介質中使用。是目前用途最廣、成本最低的橡膠密封件。不适用于極性溶劑之中,例如酮類、臭氧、硝基烴、MEK 和氯仿。一般使用溫度範圍為
-40~120 ℃。

HNBR氫化丁氰橡膠密封圈:具有極佳的抗腐蝕、抗撕裂和抗壓縮變形特性,耐臭氧、耐陽光、耐天候性較好。比丁氰橡膠有更佳的抗磨性。适用于洗滌機械、汽車發動機系統及使用新型環保冷媒 R134a的制冷系統中。不建議使用于醇類、酯類或是芳香族的溶液中。一般使用溫度範圍為 -40~150 ℃。

VMQ矽橡膠密封圈:具有極佳的耐熱、耐寒、耐臭氧、耐大氣老化性能。有很好的絕緣性能。但抗拉強度較一般橡膠差且不具耐油性。适用于家用電器如電熱水器、電熨鬥、微波爐等。還适用于各種與人體有接觸的用品,如水壺、飲水機等。不建議使用于大部份濃縮溶劑、油品、濃酸及氫氧化鈉中。一般使用溫度範圍為 -55~250 ℃。

FKM氟素橡膠密封圈:耐高溫性優于矽橡膠,有極佳的耐候性、耐臭氧性和耐化學性,耐寒性則不良。對于大部份油品及溶劑都具有抵抗能力,尤其是酸類、脂族烴、芳香烴及動植物油。适用于柴油發動機、燃料系統及化工廠的密封需求。不建議使用于酮類、低分子量的酯類及含硝的混合物。一般使用溫度範圍為 -20~250 ℃。

EPDM三元乙丙橡膠密封圈:具有很好的耐候性、耐臭氧性、耐水性及耐化學性。可用于醇類及酮類,還可用于高溫水蒸氣環境之密封。 适用于衛浴設備、汽車散熱器及汽車刹車系統中。不建議用于食品用途或是暴露于礦物油之中。一般使用溫度範圍為 -55~150 ℃。

CR氯丁橡膠密封圈:耐陽光、耐天候性能特別好。不怕二氯二氟甲烷和氨等制冷劑,耐稀酸、耐矽脂系潤滑油, 但在苯胺點低的礦物油中膨脹量大。在低溫時易結晶、硬化。适用于各種接觸大氣、陽光、臭氧的環境及各種耐燃、耐化學腐蝕的密封環節。不建議使用于強酸、硝基烴、酯類、氯仿及酮類的化學物之中。一般使用溫度範圍為 -55~120 ℃。

IIR丁基橡膠密封圈:氣密性特別好,耐熱、耐陽光、耐臭氧性佳,絕緣性能好;對極性溶劑如醇、酮、酯等有很好的抵抗能力,可暴露于動植物油或可氧化物中。适合于耐化學藥品或真空設備。不建議與石油溶劑、煤油或芳烴同時使用。一般使用溫度範圍為 -50~110 ℃。

ACM丙烯酸脂橡膠密封圈:對油品有極佳的抵抗力, 耐高溫、耐候性均佳,但機械強度、壓縮變形率及耐水性稍差。一般用于汽車傳動系統及動力轉向系統之中。不适用于熱水、刹車油、磷酸酯之中。一般使用溫度範圍為 -25~170 ℃。

NR天然橡膠密封圈:具有很好的耐磨性、彈性、扯斷強度及伸長率。但在空氣中易老化,遇熱變黏,在礦物油或汽油中易膨脹和溶解,耐堿但不耐強酸。适合于在汽車剎車油、乙醇等有氫氧根離子的液體中使用。一般使用溫度範圍為 -20~100 ℃。

PU聚氨脂密封圈:聚氨脂的機械性能非常好,耐磨、耐高壓性能均遠優于其它橡膠。耐老化性、耐臭氧性、耐油性也相當好, 但高溫易水解。一般用于耐高壓、耐磨損密封環節,如液壓缸。一般使用溫度範圍為 -45~110 ℃。

FFKM全氟橡膠:非常優異的耐化學腐蝕性能,耐酸、堿、酮、酯、醚、強氧化劑等絕大多數化學品。最高耐熱可到320℃。通常用于終極性的解決密封問題,價格為一般橡膠材質的近百倍,非常昂貴。

PTFE 聚四氟乙烯:極好的耐化學腐蝕性和耐熱性,可應用在幾乎所有的場合,空氣、光、臭氧、溫度範圍廣 -200℃~+250℃ 摩擦小,無粘着。

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