Black Natural Rubber Gasket

Kaxite KXT-1700 black natural rubber gaskets are supplied as die-cut or mould-compressed gaskets in custom sizes and shapes — flanges, manways, inspection covers, pump and valve joints, chemical tubing and shock-absorber seals — from drawing or sample. Where the joint does not require oil resistance or high-temperature resistance, natural rubber is often the most economical high-recovery elastomer in the rubber gasket range; where the joint carries oil, fuel or lubricant, an NBR (nitrile) gasket is the correct material instead.

The data below is the standard KXT-1700 natural rubber compound. Non-standard hardness, non-black colour (for example white food-grade or red oxide for identification) and custom compound variations are available on request. Include the required thickness, hardness, size and quantity in the enquiry for accurate pricing and lead time.

Black natural rubber sheet — die-cut into custom flange, manway, pump and valve gaskets.

Natural rubber is one of the most economical elastomers for general sealing, but it is not universal. The choice among natural rubber, NBR, neoprene (CR) and silicone (VMQ) depends on the media and the operating temperature. The comparison below gives the practical selection rule.

For oil and fuel service, the correct alternative is the nitrile rubber gasket (NBR) range. For outdoor, ozone-exposed or mild-chemical service, the neoprene rubber gasket (CR) range is the better specification. For high-temperature service — typically above 100°C continuous — the silicone rubber gasket (VMQ) range extends the service range considerably. For food and pharmaceutical contact, food-grade natural rubber, EPDM or silicone is the appropriate specification and should be confirmed against the applicable compliance requirement.

Natural rubber chemical compatibility reference — excellent / good / fair / not recommended against common industrial media.

Natural rubber is compatible with a specific but practical set of process media — the list below covers the media where natural rubber is typically specified and the applications where KXT-1700 is a common choice.

Compatible media: water (cold and warm), alcohols (methanol, ethanol, isopropanol), ketones (acetone, MEK), aldehydes, wet and dry organic acids (dilute acetic, formic, citric), weak acids, weak alkalis, and ammonia. Natural rubber is also used in moderate chemical industry service where no oil or aromatic hydrocarbon is present.

Common applications: cold and warm water flange gaskets, pump and valve joints, manway and inspection cover gaskets, chemical tubing seals, shock-absorber seals, ammonia-line gaskets, and general industrial seals where a soft, high-recovery elastomer is specified. Natural rubber is not recommended for contact with oils, fuels, lubricants, aromatic hydrocarbons (benzene, toluene, xylene), chlorinated solvents, concentrated acids or strong oxidising agents — for those media, NBR, neoprene, Viton (FKM) or PTFE is the correct material.

Custom gasket sizes and shapes are made from drawing or physical sample. Standard sheet thicknesses are held for fast die-cutting; thicker sections and mould-compressed shapes are made to order. For a broader overview of the rubber gasket range, see the rubber gaskets category page.

KXT-1700 is manufactured at Kaxite’s Ningbo facility and supplied factory-direct for OEM, MRO, project and distribution procurement. Standard sheet is held for fast die-cutting; custom die-cut gaskets, mould-compressed shapes and non-standard hardness compounds are made to drawing. For buyers consolidating a rubber gasket package, KXT-1700 can be combined with the NBR and neoprene gasket ranges in a single shipment, so that different media in the same plant are supplied with consistent documentation.