DESCRIPTION
O-rings are the most common and cost-effective sealing elements available. They seal over a wide range of pressure, temperature and tolerance. They are an excellent option where space limitations are a concern. And with proper hardware design, o-rings can seal a wide range of pressures from low vacuum up to several thousand PSI. O-rings are available in a wide range of elastomers as well as PTFE.
Silicone Rubber (Q, MQ, VMQ, PVMQ): Silicones have good ozone and weather resistance as well as good insulating and physiologically neutral properties. Many grades of silicone are food-grade and FDA-compliant, so they are widely used in the food, cosmetic, medical and pharmaceutical industries. However, silicone elastomers as a group have relatively low tensile strength, poor tear strength and little wear resistance.
Silicone o-rings are readily available in 70 and are typically rust red in color. Many other specialty silicone compounds are available.
SEAL INFORMATION
Low Temperature Range (F): DOWN TO -54F (SPECIAL COMPOUNDS DOWN TO -175F)
High Temperature Range (F): UP TO 400F (SPECIAL COMPOUNDS UP TO 500F)
Chemical Resistance:
- ANIMAL AND VEGETABLE OIL AND GREASE.
- HIGH MOLECULAR WEIGHT CHLORINATED AROMATIC HYDROCARBONS (INCLUDING FLAME-RESISTANT INSULATORS, AND COOLANT FOR TRANSFORMERS).
- MODERATE WATER RESISTANCE.
- DILUTED SALT SOLUTIONS.
- OZONE, AGING AND WEATHER.
Not compatible with:
- SUPERHEATED WATER AND STEAM OVER 250F.
- ACIDS AND ALKALIS.
- LOW MOLECULAR WEIGHT CHLORINATED HYDROCARBONS (TRICHLOROETHYLENE).
Durometer (Shore A): 70
Max Pressure (psi): 1,450 DEPENDING ON APPLICATION
Max Pressure (psi) WITH BACKUP RINGS: 5,000 DEPENDING ON APPLICATION
Max Speed (ft/sec): 1.5
Mating Surface Roughness - Ra (µin) - DYNAMIC: 16 MAX
Mating Surface Roughness - Ra (µin) - STATIC: 32 MAX
Part Number Definition (Inch): (AS568 3-DIGIT NUMBER)SI70
Additional Part Number Definition (Inch): 4"ID X .210"CS = 345SI70