Use in curable fluoroelastomer compositions of additives having polyacetal structure of general formula: 
        HOCH2-[Rf-CH2O(CH2O)cCH2]t-Rf-CH2OH     (I)
wherein: c = 1-10, preferably 1-3; t = 0.5-20.
Rf = poly-fluorooxyalkylenic chain, having number average molecular weight (M¯n) in the range 500-2,500, preferably 1,000-2,000;
the number average molecular weight of the formula (I) additive is in the range 3,000-15,000, preferably 3,000-10,000.
                            在可固化
氟橡胶组合物中使用具有通式为聚
缩醛结构的添加剂:
HOCH2-[Rf-
CH2O(    )cCH2]t-Rf-    H (I)
其中:c = 1-10,最好是 1-3;t = 0.5-20。
Rf = 聚
氟氧烷基链,其平均分子量 (M¯n) 在 500-2,500 之间,最好是 1,000-2,000 之间;
式 (I) 添加剂的平均分子量在 3,000-15,000 之间,最好是 3,000-10,000 之间。