司(si)盤為(wei)白色或微黃色蠟狀物(wu)、片狀體(ti)(ti)、粉沫(mo)狀（≥100目）。溶于(yu)(yu)(yu)熱的(de)(de)乙(yi)醇、乙(yi)醚、甲醇及四氯(lv)化(hua)(hua)碳，微溶于(yu)(yu)(yu)乙(yi)醚、聚(ju)醚、能(neng)分(fen)散(san)于(yu)(yu)(yu)熱水(shui)中，是w/o型(xing)乳化(hua)(hua)劑(ji)，司(si)盤具有很強(qiang)的(de)(de)乳化(hua)(hua)、分(fen)散(san)、潤滑作(zuo)用(yong)(yong)，可與各類表面(mian)活性(xing)劑(ji)混用(yong)(yong)，聚(ju)醚尤(you)其適應(ying)與吐溫－60（T-60），復配使用(yong)(yong)效果更佳。HLB(親(qin)水(shui)親(qin)油(you)平衡)值4.7，熔(rong)點52－57℃。司(si)盤為(wei)失水(shui)山梨醇與不(bu)(bu)同(tong)脂肪酸(suan)所形成的(de)(de)酯(zhi)(zhi)，如司(si)盤-20(SP-20)為(wei)月桂酸(suan)酯(zhi)(zhi)；司(si)盤-80(SP-80)為(wei)單油(you)酸(suan)酯(zhi)(zhi)。有乳化(hua)(hua)作(zuo)用(yong)(yong)。司(si)盤-80的(de)(de)原工藝系(xi)采用(yong)(yong)真空酯(zhi)(zhi)化(hua)(hua)法,反(fan)應(ying)時(shi)不(bu)(bu)斷抽去反(fan)應(ying)中生成的(de)(de)水(shui),以有利于(yu)(yu)(yu)順方(fang)向的(de)(de)反(fan)應(ying)平衡。但由于(yu)(yu)(yu)反(fan)應(ying)溫度高及反(fan)應(ying)體(ti)(ti)系(xi)內水(shui)蒸(zheng)汽分(fen)壓較低(小于(yu)(yu)(yu)40mmHg)，副反(fan)應(ying)極難控(kong)制，因而產物(wu)質量(liang)極不(bu)(bu)穩定，粘度變動(dong)幅度大，乳化(hua)(hua)性(xing)能(neng)差。

        吐溫是(TWEEN)的音譯，也叫吐溫型乳化劑，為司盤（Span，山梨醇脂肪酸酯）和環氧乙烷的縮合物，為一類非離子型去污劑。
　    由(you)于司盤為山梨(li)醇(chun)與不(bu)(bu)同聚(ju)醚F-6所形(xing)成的(de)(de)酯(zhi)，故吐(tu)(tu)(tu)溫(wen)(wen)(wen)(wen)(wen)(wen)實際上是同類型的(de)(de)系列產品，在(zai)一般(ban)精細化工店或化學試劑公司分20，40，60，80好多種，根據(ju)不(bu)(bu)同的(de)(de)需要來選(xuan)用。 吐(tu)(tu)(tu)溫(wen)(wen)(wen)(wen)(wen)(wen)20(TWEEN-20)、吐(tu)(tu)(tu)溫(wen)(wen)(wen)(wen)(wen)(wen)21(TWEEN-21)、吐(tu)(tu)(tu)溫(wen)(wen)(wen)(wen)(wen)(wen)40(TWEEN-40)、吐(tu)(tu)(tu)溫(wen)(wen)(wen)(wen)(wen)(wen)60(TWEEN-60)、吐(tu)(tu)(tu)溫(wen)(wen)(wen)(wen)(wen)(wen)61(TWEEN-61)、吐(tu)(tu)(tu)溫(wen)(wen)(wen)(wen)(wen)(wen)80(TWEEN-80)、吐(tu)(tu)(tu)溫(wen)(wen)(wen)(wen)(wen)(wen)81(TWEEN-81)、吐(tu)(tu)(tu)溫(wen)(wen)(wen)(wen)(wen)(wen)85(TWEEN-85) ；吐(tu)(tu)(tu)溫(wen)(wen)(wen)(wen)(wen)(wen)-60為硬脂酸(suan)酯(zhi)；吐(tu)(tu)(tu)溫(wen)(wen)(wen)(wen)(wen)(wen)-80為油酸(suan)酯(zhi)；吐(tu)(tu)(tu)溫(wen)(wen)(wen)(wen)(wen)(wen)-20為月(yue)桂酸(suan)酯(zhi)，為聚(ju)醚F-6去(qu)水山梨(li)醇(chun)單(dan)月(yue)桂酸(suan)酯(zhi)和一部(bu)分聚(ju)氧乙(yi)烯雙(shuang)去(qu)水山梨(li)醇(chun)單(dan)月(yue)桂酸(suan)酯(zhi)的(de)(de)混(hun)合(he)物(wu)。