There are replies to a selection of questions about fluoropolymers. Please click here if you have any other questions.


  • Q1. Difference between FKM and AFLAS®
  • Q2. Outgassing
  • Q3. Plasma resistance

AFLAS® is at an advantage of chemical resistance, especially against alkalis, such as amines, ammonia, caustic soda, etc.

AFLAS® is in the same level compared to the low outgass grade of FKM.

Depending on operating conditions, AFLAS® can be applicable like perfluoroelastomers.


  • Q1. Food-contact application
  • Q2. Application

AFLAS® 100 S polymer conforms to USP class VI. The standard formulation of each grade has passed the examination based on the ordinance No. 85 of Japanese Ministry of Health, Labor and Welfare.

AFLAS® is used for automotive oil seals because of excellent base resistance.
AFLAS® is also used for mechanical seals as an O-ring and a gasket.
AFLAS® 150 series is used for heat-resistant insulation of wire and cable, because the volume resistivity is higher than 10~15ohm-cm.


  • Q1. Bonding to other elastomers
  • Q2. Primer for metal bonding

AFLAS® can be bonded to silicon rubber and aclylic rubber.

Primer should be selected according to AFLAS® grade.
Followings are examples.

[ AFLAS® 100/150 Series ]
(1) Metaloc S-10A, from Toyo Kagaku Kenkyujo.
(2) Monicas MP-204, from Yokohama Kobunshi Kenkyujo.
(3) Monicas MP-205, from Yokohama Kobunshi Kenkyujo.

[ AFLAS® 200 Series ]
(1) Chemloc Y-4310, from Load.
(2) Chemloc 607, from Load.
(3) Monicas VT-200, from Yokohama Kobunshi Kenkyujo.


  • Q1. Inapplicable ingredient
  • Q2. Pigmenting AFLAS® in not-black
  • Q3. Processing aid

It is needed to use suitable peroxide chemical. 1,3-bis (t-butylperoxy)-diisopropylbenzene is selected.

It is possible as other elastomers are pigmented. But when coloring in bright colors, sometimes the color of the base-polymer affects the color of the vulcanizate.
Heat resistant inorganic pigments are recommended because AFLAS® needs post cure at higher than 200 deg.C.

Sodium stearate is recommended for AFLAS® 100, 150 and 200 Series. ACPE is recommended for AFLAS® to improve its flow.


  • Q1. Molding method
  • Q2. Compounding
  • Q3. Shrinkage on compression molding
  • Q4. Mold release

AFLAS® is compounded with ingredients by using a kneader, 2-roll mil etc, and molded by compression, extrusion and other molding methods as other elastomers are molded.

Sodium stearate should be dispersed well into compound, otherwise it may be a cause of bubbling.

Depending on the formulation, the shrinkage is about the same as FKM and in the range from 2.5 to 3.0 %.

As an external mold release agent Trasys 818 (from DuPont) is recommended for AFLAS® 100 and 150 Series.


  • Q1. Product form : compound / polymer

AFLAS® is available in both product forms of polymer and compound. Please contact us for the detailed information.

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