Factory-side guide to FKM and Viton chemical gloves: where they outperform nitrile, what EN ISO 374 testing means, and the real MOQ, lead time, inspection and export limits B2B buyers should expect.
When Nitrile Is Not Enough
FKM chemical resistant gloves are usually specified after cheaper materials have already failed on site. Typical failure points are 0.38 mm unsupported nitrile swelling after xylene wiping, PVC becoming hard after petrol splash, or neoprene showing short breakthrough against mixed solvents used around paint, resin, ink or adhesive lines. FKM, often requested as Viton, is not a premium version of nitrile. It is a fluoroelastomer choice for narrow chemical risks where permeation resistance is more important than low price, high dexterity or disposable use. The first question is never simply whether the glove is chemical resistant. We need the chemical name, CAS number where available, concentration, temperature, contact time and exposure type. Five minutes of splash during drum sampling is not the same risk as 30 minutes of immersion while cleaning a solvent tank. EN ISO 374-1:2016+A1:2018 classifies chemical protective gloves by permeation result. Type A needs level 2 or better against at least 6 listed chemicals, Type B needs at least 3, and Type C needs at least 1. The test method behind permeation is EN 16523-1. A catalogue claim such as fuel resistant or solvent resistant is not enough for a buyer handling toluene, MEK, xylene, gasoline blends, ketones or chlorinated solvents. FKM can perform well against many aromatic hydrocarbons, fuel-related exposures and selected organic solvents, but the result depends on compound recipe, wall thickness, cure, lining and glove construction. A 0.70 mm glove is not automatically covered because a 0.45 mm glove passed one laboratory test. A flock-lined version should not borrow an unsupported glove report unless the report scope clearly covers that construction.
What FKM Actually Is
FKM is a family of fluoroelastomer rubbers. Viton is a well-known trade name, but an RFQ should specify FKM or fluoroelastomer rather than relying only on a brand word. Most FKM chemical gloves are moulded reusable chemical gloves, normally unsupported or cotton-flock lined. They are not made by dipping a 13 gauge nylon liner in a palm coating. Common industrial thicknesses are around 0.40 mm, 0.45 mm, 0.50 mm, 0.60 mm and 0.70 mm. Common lengths are 300 mm, 350 mm and 400 mm. Colour choice is more limited than buyers expect. Black and dark brown are realistic because carbon black, filler package and cure behaviour are part of the compound design. Bright private-label colours are possible only if the compound supplier can maintain chemical performance, tensile properties and ageing behaviour after pigment changes. For FKM, we would rather reject a cosmetic colour request than ship a glove that looks good but has no chemical data. Construction choices change use in the field. Unsupported FKM is easier to rinse, inspect and dry after work. Cotton flock helps donning and sweat comfort, but it can hold contamination if the cuff is dipped into liquid or if workers remove gloves with dirty hands. A straight cuff is simple to inspect and pack flat. A rolled cuff can reduce tearing during donning, but it adds bulk and may trap liquid at the edge. Grip is usually moulded diamond, lozenge or roughened texture. It will not grip like sandy nitrile because the material and moulding route are different. GloveMark should be clear about our own production. Our normal Yiwu lines cover 13 gauge, 15 gauge and 18 gauge nylon, polyester, HPPE and aramid liners with PU, latex, smooth nitrile, sandy nitrile or foam nitrile coatings. We do not mould FKM chemical gloves on those knitting and dipping lines.
Standards Buyers Should Ask For
For Europe and many international tenders, the base glove standard is EN ISO 21420:2020. It covers sizing, dexterity, innocuousness, marking and user information. Chemical protection is claimed under EN ISO 374-1:2016+A1:2018. Microorganism protection is under EN ISO 374-5:2016 and should not be assumed from a chemical pictogram. Permeation is tested under EN 16523-1. Degradation should be requested under EN ISO 374-4:2019 because some gloves swell, harden, crack or lose strength before a simple breakthrough time explains the full risk. Breakthrough levels are often misread. Level 1 is more than 10 minutes, level 2 more than 30 minutes, level 3 more than 60 minutes, level 4 more than 120 minutes, level 5 more than 240 minutes and level 6 more than 480 minutes. These are controlled laboratory results on new material at a stated test temperature, usually 23 degrees C unless the report says otherwise. They are not permission to wear one contaminated glove for a full shift. Flexing, abrasion, heat, sweat, cleaning chemicals and mixed solvents can reduce real-use performance. The EN ISO 374-1 letter code must match the site chemicals. J is n-heptane, K is sodium hydroxide 40 percent, L is sulphuric acid 96 percent, M is nitric acid 65 percent, N is acetic acid 99 percent, P is hydrogen peroxide 30 percent, S is hydrofluoric acid 40 percent, and T is formaldehyde 37 percent. Buyer concerns such as MEK, xylene, toluene, methanol, acetone and gasoline additives are not fully answered by the standard letter code. For North American buyers, ASTM F739 permeation data is often more useful than an EN pictogram alone because EHS teams build chemical-specific glove matrices. For CE Category III PPE, ask for the actual certificate scope, user instructions and Declaration of Conformity, not just a pictogram in artwork. The material description, thickness, lining and model number on the report must match the ordered glove. We will not change dates, reuse a report from another compound, or label a neutral industrial glove as certified PPE without valid documentation.
Where FKM Works and Where It Does Not
FKM gloves are considered for petrochemical maintenance, aviation fuel handling, solvent transfer, paint and coating work, resin plants, chemical sampling and wipe-down jobs where splash or intermittent contact is expected. A 300 mm glove may be enough for bench work. A 350 mm length gives better forearm coverage for maintenance. A 400 mm glove is more suitable where users reach into trays, drums or wet parts. If liquid can run above the wrist, cuff length and sleeve interface should be checked before any order is placed. The limits should be stated before price negotiation. FKM is not a cut glove, not a heat glove and not a disposable examination glove. If tested to EN 388:2016+A1:2018, mechanical scores may be modest compared with a 13 gauge HPPE liner with sandy nitrile palm coating. Dexterity is also lower. A 0.50 mm fluoroelastomer wall cannot flex like a 0.10 mm to 0.12 mm disposable nitrile glove, and workers notice this when handling small valves, sample lids, pipette caps, cable ties or instrument buttons. For glass edges, sheet metal or heavy handling, some sites wear a cut liner under the FKM glove. That can work only after a full system trial. An inner EN 388 cut liner changes fit, increases sweat, reduces finger feel and can make doffing harder when the outer glove is contaminated. A new glove inspected on a desk will not show cuff interference, solvent smell after rinsing, finger fatigue or night-shift operator rejection.
Specification Details That Change the Quote
A useful RFQ should state FKM or fluoroelastomer, target thickness, length in mm, lined or unlined construction, size range, cuff style, grip pattern, colour, marking, packing, required standards and chemicals to be checked. Industrial size runs are commonly 8, 9, 10 and 11. Size 7 is often added for laboratories or mixed teams. A 350 mm unlined glove at 0.45 mm is not the same cost or performance as a 400 mm cotton-flock lined glove at 0.70 mm. The heavier version uses more compound, needs a longer cure window and takes more carton volume. MOQ is not comparable with PU or nitrile-coated assembly gloves. If an existing mould and existing FKM compound can be used, a realistic trial order may be 500 to 1,000 pairs per size, or around 2,000 to 3,000 pairs total. A new length, unusual size spread, custom colour, new flock lining or new mould can push MOQ higher and may add mould charges. Sampling is usually 2 to 4 weeks when the mould exists. Bulk production is commonly 6 to 9 weeks after sample approval, artwork approval and deposit, before ocean freight time. Price must be treated as project-specific. FKM is a high-value reusable chemical glove, not a USD 1 dipped work glove. FOB China pricing depends on compound cost, thickness, length, lining, test requirement, packing and order size. CE Category III PPE also adds cost because user instructions, EU language requirements, Declaration of Conformity control, notified body documentation and label approval take time. A neutral carton order for an existing model moves faster than a private-label tender pack with barcode labels, multilingual inserts and third-party pre-shipment inspection. Small artwork choices can also delay production. A printed glove mark needs ink compatibility and abrasion checking. A polybag with suffocation warning, EAN barcode and multilingual size label needs proof approval before packing. Carton marks should include model, size, quantity, gross weight, net weight, carton dimensions and country of origin. If the buyer wants Amazon-style FNSKU labels or retailer-specific carton routing labels, that should be stated before the PI is issued.
Inspection, Packaging and Export Checks
Chemical glove inspection cannot stop at pair count and carton condition. The checklist should include pinholes, thin spots, uncured or tacky areas, blisters, cuff cracks, uneven wall thickness, left-right matching, size marking, flock contamination and grip surface defects. Thickness should be checked at agreed points such as palm, finger and cuff because a nominal 0.50 mm glove with thin fingers may not perform like the approved sample. For shipment inspection, AQL 2.5 for major defects and AQL 4.0 for minor defects is a common commercial starting point. For high-risk chemical handling, some buyers require tighter sampling or 100 percent air inflation leak testing, which must be agreed before production because it adds labour and lead time. Packaging must prevent crushed cuffs and permanent creases. A common export pack is 1 pair per polybag, then 6 or 12 pairs per inner bag, with 36 or 72 pairs per carton depending on length and thickness. A 400 mm 0.70 mm glove will not pack like a 300 mm 0.45 mm glove. We normally keep gross carton weight under about 18 kg for warehouse handling and confirm palletisation for LCL or FCL shipment. Chemical gloves usually cube out before they weigh out, so carton dimensions matter early. A buyer planning a 20 ft container needs carton data, not only pair quantity. Most B2B orders are quoted FOB Ningbo or FOB Shanghai. EXW is possible when the buyer uses its own China consolidator. CIF or DAP can be arranged through a forwarder, but import duty, local PPE registration and market surveillance remain the importer responsibility. For CE-marked Category III PPE, the importer or brand owner must control the EU Declaration of Conformity, technical file, notified body certificate where applicable, user instructions and market-language labelling. GloveMark can coordinate neutral bags, private-label artwork, barcodes and carton marks. We do not create fake CE paperwork or treat one compound report as a universal certificate.
How We Would Source This Properly
The clean process starts with the SDS for each chemical, concentration, contact time, operating temperature, splash or immersion condition, and required standard. We also ask whether the glove will be worn over another liner, whether users need 300 mm, 350 mm or 400 mm length, and whether the job involves abrasion, wet grip or fine handling. Without that information, a supplier can only quote a shape and thickness, not a reliable chemical glove for a known exposure. Samples should be marked with size, length, lining, nominal thickness and batch reference so the buyer can compare them properly. For serious projects, a 7 to 14 day site trial is more useful than a meeting-room approval. Operators will quickly report stiffness, sweating, cuff interference, grip problems, odour after rinsing and doffing issues. For repeat supply, the purchase specification should lock the compound, nominal thickness and tolerance, length, lining, cuff, grip, marking, packing, inspection method and approved test report reference. A change from unlined to flock-lined, from 0.45 mm to 0.60 mm, or from 350 mm to 400 mm should trigger sample reapproval because permeation, dexterity, fit and carton cube all change.
Confirm the specification in writing
Use this article as a starting point. Ask GloveMark for written, project-specific confirmation of materials, MOQ, pricing, sample policy, certification scope and lead time before placing an order.
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