... 4.Non-toxic,UV Resistant. Details about silicone o ring / silicone seal : Strength of Silicone MaterialElongationexcellent PermeabilityexcellentOxygen Resistantexcellent High and low temperature resistanceexcellentOzone ... Temperature ResistantexcellentAnimal and Vegetable Oil Resistancesuitable1. Materials: comply to ROHS, Silicone (VMQ), or NBR, EPDM, Viton, etc.2. Temperature: -40~220 ...