Class 300 LB Spiral Wound Gasket, ASME B16.20, SS 316, 4 Inch

Oct 13, 2025

316 spiral wound gaskets are primarily composed of metal strips and non-metallic filler materials. The metal strips are typically made of stainless steel, alloy steel, etc., while the filler materials include graphite, asbestos, ceramic fiber, etc. The 316 gasket is a type of molybdenum-containing stainless steel that offers better corrosion resistance and high-temperature performance. The metal strips and filler materials are spirally wound into a helical shape using specialized equipment to form an elastic and sealing gasket. This structure enables the metal spiral wound gasket to maintain stable sealing performance in high-temperature and high-pressure environments.

316 stainless steel is an austenitic stainless steel, whose main components include iron, chromium, nickel, and molybdenum. The chromium element imparts good corrosion resistance to stainless steel, the nickel element enhances its toughness and ductility, while the molybdenum element further improves its resistance to pitting and crevice corrosion. Compared to 304 stainless steel, 316 stainless steel performs better in chloride environments, making it more suitable for marine or chemical applications. 316 stainless steel can still maintain good mechanical properties at high temperatures, making it an ideal material choice for metal spiral wound gaskets.

Specification

Product Name: Class 300 LB Spiral Wound Gasket
Type: Spiral Wound Gasket
Standard: ASME B16.20
Size: 4 Inch, DN100
Pressure Class: Class 300 LB, PN50
Material: SS 316 (Inner & Outer Rings); Graphite (Filler)
Facing: Raised Face

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