Non-Asbestos Jointing Sheets KNNY350

KNNY350 is a compressed non-asbestos jointing sheet from the KNNY oil-resistant family, not a finished die-cut gasket. Buyers cut it into flange gaskets, heat-exchanger gaskets, oil-line seals, pump and valve joints and custom-shaped seals, or specify cut-to-size gaskets made from it. Its value over the standard non-asbestos jointing sheet range is oil resistance combined with the highest tensile strength in the Kaxite non-asbestos sheet line — 15.0 MPa, roughly 36% higher than KNNY300 and 3× the KNXB200 entry grade.

The data below covers the KNNY350 standard specification. Alternative thicknesses, non-standard sheet sizes and cut-to-size gaskets are quoted against drawing or drawing dimensions. Include the sheet size, thickness and any cutting requirement in the enquiry for accurate pricing and lead time.

Kaxite’s non-asbestos jointing sheet line is split into two families. The KNXB series is the general-purpose non-oil-resistant line, with density 1.6–2.0 g/cm³, tensile strength from 5.0 to 11.0 MPa, and no oil-sealing test requirement. The KNNY series is the oil-resistant line, with density 1.6–1.8 g/cm³, tensile strength from 8.0 to 15.0 MPa, and all grades tested to aviation gasoline. KNNY350 is the top of the KNNY series and — measured by tensile strength — the strongest non-asbestos jointing sheet in the Kaxite range.

Two rules of thumb for procurement. First: if the joint carries oil, fuel, lubricant or aviation fluid — even occasionally — specify a KNNY grade; a KNXB grade is not tested for oil and may swell or lose tensile strength. Second: within KNNY, move up the series only when the operating condition actually demands it. KNNY250 covers most general oil-line joints; KNNY300 is the practical step up for higher-pressure hydraulic and lubricant circuits; KNNY350 is specified where bolt load is limited, where the joint sees thermal cycling, or where the highest available tensile strength is required for large-diameter flanges. For thinner sheets or cut gaskets, see the KNNY300 and KNNY250 pages.

KNNY350 is supplied as standard sheet in six stock sizes with thickness from 0.5 mm to 6.0 mm. Non-standard sizes, intermediate thicknesses and cut-to-size gaskets — full-face, ring, oval, rectangular or drawing-specific — are made to order. For applications requiring cut gaskets rather than sheet, see the non-asbestos gasket range.

Packing: wooden pallet of approximately 1,000 kg or 2,000 kg net, depending on sheet thickness and total quantity. Sheet is supplied interleaved and pallet-wrapped for transport.

KNNY350 is a sheet material, so its applications are the applications of the gaskets cut from it. The oil-resistant chemistry of the KNNY series makes it a natural fit for oil-line flanges, fuel-system joints, lubricant-circuit seals, hydraulic flanges and transformer-oil equipment. Its 200°C temperature rating and 1.5 MPa working pressure cover low-pressure steam, hot-water, air and neutral-gas flanges, which is why it also appears in general plant maintenance alongside oil-service work. Its 15.0 MPa tensile strength and 30% stress relaxation make it the grade to select when the flange is large, when bolt load is limited, or when the joint sees thermal cycling — conditions where a lower-grade sheet would relax and leak.

In practice, KNNY350 is specified in oil refineries and petrochemical plants for hydrocarbon and lubricant service, in power plants for fuel-oil and low-pressure steam joints, in marine and shipyard work for fuel-line and lube-oil flanges, in transformer and switchgear manufacturing for oil-tight joints, and in general engineering workshops that need a single oil-resistant sheet that covers most of their flange work. For applications involving strong acids, solvents or higher temperatures, the asbestos sheet range may still be the more appropriate specification — as always, match the material to the actual media and duty, not to the marketing label.

KNNY350 is manufactured at Kaxite’s Ningbo facility and supplied factory-direct for OEM, MRO, project and distribution procurement. Standard sheet sizes are held for fast shipment; non-standard sheet sizes, thicknesses outside 0.5–6.0 mm, cut-to-size gaskets and private-label packaging are available against drawing or purchase specification. For buyers consolidating a sheet-gasket package, KNNY350 can be combined with compression sheet and braided packing lines in a single shipment.