Flame retardancy FPM polyurethane u-cup seal

Flame retardancy FPM polyurethane u-cup seal

    Fluorine rubber is refers to a synthetic polymer elastomer which have the fluorine atom on the Main

chain or side chain of carbon atoms , we always called it" FPM".

    FPM rubber is the only one can apply under the condition of high altitude.Under the 1.33*10-7Pa,

other rubber can't  be used to sealing. Hence, Fluorine rubber have  widely used  in  the chemical  area

and space navigation area etc. Fluorine rubber can be used for inorganic acid medium sealing:               

• 67% sulfuric acid under 140 ℃,                                
• 70 ℃ concentrated hydrochloric acid,                  
• nitric acid of 30% under 90 ℃ can be used for a long time.

 1. FKM/FPM molecular structure          

    CF3 —(CH2—CF2 ) ( CF2—CF) A—Type CF3 —(CH2—CF2 ) ( CF2—CF) (CF2—CF2 ) B—Type

/  F —Type CF3 —(CH2—CF2 ) ( CF2—CF) (CF2—CF2 )CSM G —Type OCF3 —(CF2—CF ) ( CH2

—CH2) (CF2—CF2 ) ETP —(CF2—CF2 )( CH2—CH) TFE/  P || C H3 

2. Chemical and physical properties.    

    Its Vinyl fluoride and hexafluoropropylene copolymer,In the mid - 1950 - s into the market.the specific

gravity up to 1.85.According to its molecular structure and fluoride content,the fluorine rubber chemical

resistance and low temperature resistant performance is also different.

    Fluorine rubber have the function of : the flame retardancy (from self-extinguishing fire), excellent airt-

ight sealing (vacuum degree can reach 1.33 X10-7 ~ 8 X10-1.33 pa), ozone resistance, corrosion resi-

stance, good aging resistance and widely used as the  chemical resistance properties.

3. Temperature range.                              

• static sealing:-26℃~232℃                                            
• dynamic seal:-15℃~200℃

4. Hardness range: Shore A 50℃-90℃