2.5X12 Metric Silicone O-Ring - 70A Durometer, 12 mm ID, 17 mm OD, 2.5 mm CS, Red (Pack of 100) Actual Dimensions: 0.472" ID, 0.669" OD, 0.098" CS, Metric Dimensions: 12 mm ID, 17 mm OD, 2.5 mm CS Temperature Range: -60°C (-76°F) to 225°C (437°F); Shelf-life: Unlimited These versatile o-rings perform well in engine & transmission oil (mineral oils), diluted salt solution, moderate water, dry heat, and ozone & weather resistance Designed for use in a wide variety of sealing applications, this Silicone o-ring is FDA-compliant Silicone o-rings have excellent heat, ozone and corona resistance and have good dielectric stability and resistance to many oils, chemicals and solvents. Silicones possess the best flexible property at low temperature but have low tensile strength and poor wear and tear resistance. The 70A Durometer Silicone o-ring has a round cross-section and can be used across a wide temperature range (-60°C/-76°F to 225°C/437°F). Mr O-Ring has all your 70A Durometer Silicone o-ring needs covered with our extensive metric size range.