What material is the o-ring made of?

• A. Sillicone
• B. Silicone
• C. Rubber
• D. Plastic

Answer: (A)

O-rings are seals chosen for their ability to compress and rebound while resisting the environments they encounter. Silicone (often referred to as silicone rubber) is a common material for o-rings because it stays flexible over a wide temperature range and resists many chemicals, making reliable seals in automotive, food-grade, and medical applications. The option uses a misspelled form, but it points to silicone, which is the intended material. Rubber in general is a broad category and can be suitable in some cases, but silicone offers better temperature stability and chemical resistance for many sealing needs. Plastic isn’t a typical o-ring material because it doesn’t provide the necessary elasticity and sealing performance.