The 2026-07-12 DirectIndustry seal and gasket directory lists 271 manufacturers offering 1,393 products, with 269 companies (1,352 products) appearing on the main page index alone [S1]. A separate 2026-05-30 parts-seal index tracks 15 manufacturers and 37 stocked product lines from names such as AESSEAL, BONSING and SHIJIAZHUANG RUISUO [S3].
Selection pressure in 2026 runs along three axes: elastomer vs. graphite vs. ePTFE, cut gasket vs. spiral-wound, and engineering distributor vs. direct mill. Buyers chasing chemical service typically end up on PTFE or expanded graphite sheet; buyers chasing hydrocarbon flange service end up on spiral-wound with graphite or PTFE filler. See the gasket selection map for a flange-class-driven shortlist.
Material families and published operating envelopes
Latty's LATTYgold 32 NBR-SBR calendered sheet is rated 0 °C to 300 °C at 0–60 bar, while the lower-density LATTYgold 32R variant drops to -50 °C to 180 °C at 0–40 bar [S2]. Latty's expanded-graphite LATTYgraf EFA, laminated over 1.4404 (316L) tanged stainless, is published at -200 °C to 650 °C and 0–650 bar for the highest pressure/temperature static service on the sheet index [S2].
Donit Tesnit's TESNIT BA-202 fibre sheet is rated 140 °C / 40 bar for non-demanding service, supplied as 1500 × 1500 mm, 3000 × 1500 mm, and 4500 × 1500 mm sheets in 0.5 mm and adjacent thicknesses [S2]. Frenzelit's novaflon® 500 multiaxially oriented ePTFE sheet and 3P ePTFE sheet (-240 °C to +260 °C continuous, +310 °C short-term) sit on the upper end of the chemical-resistance branch [S2].
FKM and FFKM perfluorinated compounds are supplied as compounds and molded parts by Ningbo Kaxite Sealing Materials, which has focused on fluorinated elastomers since 2009 and markets FFKM and FKM lines separately from molded parts [S6]. For elastomer gaskets in static or light-dynamic service, broader selection criteria including gland geometry sit in the O-ring selection guide.
Form factor: sheet stock vs. cut gaskets vs. spiral-wound vs. metal
Sheet stock (KLINGER, LATTY, Frenzelit, Donit Tesnit, TESPE, Latty, Phelps Industrial Products) dominates the "multiple gasket sheet" category with KLINGER holding 20 listed products and LATTY 19 [S4]. Elastomer-seal listings add another 52 manufacturers with 167 products on the 2026-06-25 index, with DICHTOMATIK SAS, A.W. Chesterton, EagleBurgmann and AESSEAL each holding multi-product lines [S5].
Cut or formed static gaskets run on the same sheet but require a choice of insert. Spiral-wound gaskets—alternating metal strip and non-metallic filler—are listed by SHIJIAZHUANG RUISUO for high-pressure flange service, with the catalogue entry showing both metal and non-metallic wound construction [S3]. Kammprofile and solid metal gaskets (e.g. Smalley K-Seal, machined, -250 °C to 423 °C) cover the upper edge where elastomer and graphite fail [S3].
For dynamic radial sealing on rotating shafts, lip seals and V-rings from SHIJIAZHUANG RUISUO are listed at -40 °C to 100 °C and 3–2,000 mm diameter, separate from the static-gasket product tree [S3]. Cross-reference with the O-ring types and applications 2026 map for static and dynamic elastomer choices that share compounds with elastomer gasket families.
Manufacturer tiers by evidence on the directories
Tier 1 (multi-product, multi-region, distributor-style catalogues): Flexitallic (11), Frenzelit (18), KLINGER (20), LATTY INTERNATIONAL (19), DICHTOMATIK SAS (18), GREENE TWEED (10), DONIT TESNIT (10), AESSEAL (18), EagleBurgmann, EVCO (46) [S1][S2][S4][S5]. These suppliers ship cut gaskets, sheet stock, spiral-wound, and kammprofile lines simultaneously, and appear on multiple sub-indices within the DirectIndustry tree.
Tier 2 (focused catalogue, regional, or single-material specialists): Carrara Global Sealing Solution (12), Epidor Seals & Rubber Technology (13), beijing Jianke Huifeng Science and Technology (19), Hebei Deyi Plastic Product (23), cixi zonde sealing and gasket (21), ANHUI ZHONGDING SEALING PARTS (12), Ningbo Kaxite (FFKM/FKM compound) [S1][S6]. Hebei Deyi's 23 listed items and cixi zonde's 21 reflect broader polymer and plastic-part catalogues rather than pure sealing depth.
Tier 3 (trading/export with smaller SKU counts on the index): Ami Polymer (8), APSOparts (5), CHROMEX (10), Artic Seals (40) — the Artic Seals number is product-rich but appears under a single trading header, suggesting consolidated listings [S1]. Treat SKU counts as catalogue breadth, not manufacturing depth: a 40-line listing may be one trading house reselling 40 vendor SKUs.
What the spec sheets actually prove
Temperature and pressure limits in the directory entries are manufacturer-published values, typically tested with new gaskets, new flanges, and specified surface finishes. TESNIT BA-202's 40 bar / 140 °C is paired with a 2AS surface finish, which is the same baseline finish expected on standard ASME B16.5 flanges [S2]. Lattygraf EFA's 650 bar ceiling applies to the laminated, tanged-stainless form, not bare graphite foil — the steel insert is what holds 650 bar [S2].
ePTFE sheets (-240 °C to +260 °C) tolerate cryogenic service that NBR (-50 °C floor on LATTYgold 32R) cannot [S2]. Conversely, NBR sheets handle oils and hydrocarbons that ePTFE does not, at a lower unit cost. The 3P ePTFE entry explicitly cites +310 °C short-term peaks; on a flange with continuous steam at 300 °C, this margin is thin and most buyers would step up to expanded graphite.
Standard references show up only when manufacturers volunteer them: Lattygraf EFA mentions compliance with EU 2011/65/EC (RoHS) for the expanded mineral graphite grade, and Donit Tesnit's TESNIT BA-202 cites standard 1500 mm and 3000 mm sheet footprints common to EN 1514-1 [S2]. Buyers serving ASME-only sites should re-validate EN-cited sheets against ASME B16.21 before installing.
Selection criteria for a 2026 RFQ
Match the spec, not the brand, first. Flange class, fluid, temperature, and ASME/EN jurisdiction determine the gasket form (sheet, spiral-wound, kammprofile, RTJ). Then match the material: NBR / NBR-SBR for oils and water under 200 °C; ePTFE for aggressive chemicals under 260 °C; expanded graphite for steam and hydrocarbons to 650 °C; spiral-wound with graphite or PTFE filler for ASME Class 300+ flanges; FFKM only where both temperature (>250 °C) and aggressive chemistry coexist. [S2]
For procurement, the practical decision tree in 2026 looks like this: (1) confirm flange standard and class; (2) fix media and temperature range; (3) pick form factor (sheet, cut, spiral-wound, kammprofile, metal); (4) match material family to the fluid compatibility table; (5) require published temperature AND pressure limits, not generic "high-temp" claims; (6) ask for surface-finish requirements and bolt-load data; (7) decide whether you need mill-direct or distributor stock.
Buyers sourcing gasket sheet, cut gaskets, spiral-wound gaskets, and metal gaskets should also pre-qualify two Chinese sheet mills (e.g. KLINGER-class or Kaxite FFKM compound partners) and two EU mills to avoid single-source risk on long-lead expanded graphite and FFKM [S1][S6].
Limitations and failure modes buyers overlook
Low-temperature NBR (LATTYgold 32R) at -50 °C is the floor of the NBR-SBR family; below that, switches to silicone, FKM, or ePTFE are mandatory [S2]. Published temperature ceilings are continuous ratings, not peaks — verify short-term surge data with the manufacturer before installing in cyclic service. Surface finish drives leakage: a 2AS finish on TESNIT BA-202 cannot be downgraded to a mill finish without re-rating the gasket [S2].
Distributor-listed SKU counts overstate capacity. A trading house with 40 listings may not stock any of them, so lead time is the actual differentiator. For genuine compound depth (FFKM, peroxide-cured FKM, graphite with controlled chloride content for nuclear service) the manufacturer's own compound line, not its distributor network, is what matters [S6].
Verify hot creep and creep relaxation data independently of the published temperature/pressure envelope, especially for graphite laminates and flexible graphite without metal inserts. The 650 °C / 650 bar envelope on Lattygraf EFA is the tanged-stainless form; the unreinforced graphite sheet on the same page is a much weaker product [S2]. A 650 °C ceiling on a non-reinforced graphite sheet is unrealistic — confirm the construction before quoting.
Trackable signals for the next sourcing cycle
Watch the EU directive 2011/65/EC (RoHS) compliance statements that graphite suppliers already publish (Lattygraf LGRF cites it on the same index page) — any new PFAS-driven restriction on PTFE and ePTFE sheets will surface here first [S2]. New SKUs from KLINGER (20 listed) and LATTY (19 listed) tend to lead the sheet-stock side; new SKU additions on the AESSEAL (18), DICHTOMATIK (18), and EVCO (46) lines tend to lead the elastomer and finished-gasket side [S4][S5]. A new product count delta on these flagship accounts at the next DirectIndustry crawl is the cleanest forward indicator of supplier-side capacity.
Spec-level background on the components involved: gasket, industrial adhesive, and industrial borescope.