High-purity flexible graphite formed into a dense homogeneous ring under high pressure — self-lubricating, chemically inert, and rated for cryogenic to 1650°C service in inert atmospheres. Factory-direct pricing, custom sizes, free samples available.
A die-formed graphite ring is manufactured by compressing high-purity exfoliated graphite into a precision die under high pressure. Unlike machined rings cut from a graphite block, die-forming produces zero waste, uniform density and superior structural integrity across every batch. The result is a self-lubricating, chemically inert seal that performs from cryogenic temperatures to 3000°F (1650°C) in inert or reducing atmospheres.
As a leading die-formed graphite ring manufacturer in China, Kaxite Sealing supplies plain, reinforced, profile and anti-extrusion rings at factory-direct prices. Reinforcement options include SS 304/316, Inconel and Monel for high-pressure or high-speed dynamic service. See Graphite Packing and Molded Packing Ring for related sealing products.
Direct from the factory floor to your gland
99% graphite, no binders
Up to 1650°C inert
pH 0-14, all media
SS, Inconel, Monel
Try before ordering
| Parameter | Specification | Notes |
|---|---|---|
| Inner Diameter (ID) | 6 mm – 3000 mm | Custom beyond range on request |
| Outer Diameter (OD) | 19 mm – 3175 mm | Tight tolerances for gland fit |
| Cross-Section | 1.5 mm – 25 mm | Others custom-engineered |
| Temperature | -240°C to +1650°C (inert) | Up to 430°C in oxidizing atmosphere |
| Pressure Rating | Up to 3000 psi (200 bar) | Higher with reinforcement |
| Density | 1.44 – 1.76 g/cm³ | Customized per pressure |
| Compressibility | 40% – 60% | Recovery 15% – 30% |
| Certifications | ISO 9001, API 607, ASTM | FDA / USP VI on request |
Not sure which style fits your gland? Send us your shaft diameter, housing bore, gland depth and operating media — our engineers will recommend the right ring profile. You can also review our Quality Control process and Certificate page.
10 pcs
7-15 Days
T/T, L/C
DHL / FedEx / Sea
Die-formed rings are compressed from graphite flakes into a precision die, producing uniform density, zero waste and a stronger homogeneous structure. Machined rings are cut from a graphite block, which creates more waste and can vary in density across the cross-section. See the Die-Formed Graphite Ring product page for full specifications.
Lower density (around 1.44 g/cm³) rings are softer and more compressible, ideal for low-pressure or uneven surfaces. Higher density (around 1.76 g/cm³) rings resist extrusion under pressure. Our engineers will recommend the optimal density once we know your pressure, temperature and gland design — just send us your inquiry.
Reinforcement with SS 304/316, Inconel or Monel foil is recommended for dynamic applications with high peripheral speed, high-pressure systems where blow-out is a risk, or large pressure differentials. The metal insert dramatically increases tensile strength while preserving graphite's sealing properties. See related Injectable Sealants for complementary sealing solutions.
Yes. We manufacture to any ID, OD and cross-section within the ranges shown in the specifications table above, including non-standard profiles. Please send your inquiry with a drawing or the shaft/bore dimensions for a fast quotation.
Yes, free samples are available for quality evaluation — you only cover the courier cost. Our facilities are ISO 9001 certified and products can be supplied to API 607, ASTM and DIN standards. FDA and USP Class VI materials are available on request. See our Certificate and Packaging & Shipping pages for details.
Send your shaft diameter, gland dimensions and operating media today — our sales team replies within 24 hours with a competitive quotation.
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