• Buna-N resists wear and tear and is often used with petroleum-based chemicals, fluids, and alcohols. Also called nitrile, this material is used in a wide range of sealing applications.
• Hytrel® is a thermoplastic polyester elastomer (TPE) that resists abrasion, high temperatures, and hydraulic oil and water. It is flexible and provides a strong seal.
• PTFE resists acids, ammonia, petroleum products, synthetic lubricants, coolants, and chemicals. This material is durable and rigid and often used with aggressive and corrosive materials.

The exact measured thickness (cross-section) of the O-ring — may differ slightly from the nominal size due to tolerances.

The color of the product, which may indicate material type, compliance (e.g., FDA), or specialty properties (e.g., metal detectability).

The shape of the sealing surface, typically circular for standard O-Rings, but may vary (e.g. Quad, Square, X-Ring).

The hardness of the O-Ring material, measured on the Shore A scale (e.g. 70A) — affects flexibility, resistance to compression, and sealing performance.

The substance the product is made from — chosen based on application requirements like durability, temperature, pressure, or chemical/corrosion resistance.

Unit of Measure

Specifies if the O-Ring contains additives that allow it to be detected by metal detectors — useful in food and pharma industries.

The standard or listed cross-section size used for classification — may differ slightly from the actual measured CS.