How to source butyl rubber gloves for acetone, MEK and aggressive solvent work, with EN ISO 374-1 test logic, thickness and length choices, MOQ, lead time, inspection points, Incoterms and factory limits.
Where Butyl Makes Sense
Butyl rubber gloves belong on RFQs where the exposure list is led by fast polar solvents: acetone CAS 67-64-1, methyl ethyl ketone or MEK CAS 78-93-3, methyl isobutyl ketone or MIBK CAS 108-10-1, ethyl acetate CAS 141-78-6, ink wash, resin clean-down, aviation maintenance solvent, paint stripper, laboratory waste transfer or drum sampling. A 0.10 mm disposable nitrile glove may be fine for oil splash, grease, many water-based chemicals and short dirty work, but ketones can permeate many nitrile films quickly. For acetone or MEK as a named hazard, the starting point should be IIR butyl compound with a permeation report tied to the offered wall thickness, usually 0.35 mm, 0.50 mm or 0.70 mm. This is not the same production route as our Yiwu 13 gauge nylon, polyester or HPPE liner gloves with nitrile, PU or latex palm coating. Butyl chemical gloves are made through rubber glove production: compound mixing, filtration, former cleaning, dipping or moulding, controlled drying, vulcanisation, stripping, post-wash or chlorination, leak checking and packing. That affects MOQ, colour choice, mould length, sample speed, test paperwork and private-label flexibility.
Standards and Test Data to Ask For
For EU or UK resale, ask for EN ISO 374-1:2016+A1:2018 classification, EN 16523-1:2015+A1:2018 liquid chemical permeation data and EN 374-2:2014 penetration leakage performance. A Type A glove under EN ISO 374-1 must achieve breakthrough time above 30 minutes against at least 6 chemicals from the standard list. Useful letter codes include A for methanol, B for acetone, C for acetonitrile, K for sodium hydroxide 40 percent and L for sulphuric acid 96 percent. MEK and MIBK are not EN ISO 374 fixed letter chemicals, so they need separate EN 16523-1 or equivalent reports naming the chemical, CAS number, test temperature, glove thickness and breakthrough time. Do not buy from the phrase solvent proof. No rubber glove is solvent proof. Swelling, tackiness or hardening is degradation; permeation is molecular movement through the film and can happen before the glove looks damaged. Ask whether the reported breakthrough time was tested at 23 C, as many lab reports are, and compare that with the real workplace. A 0.50 mm butyl glove tested with acetone at 23 C should not be treated as equal to a 0.35 mm glove used next to a 35 C heated wash tank. For US programmes, ASTM F739 permeation data may be acceptable. ASTM D6978 is for chemotherapy drug permeation and is not a substitute for acetone, MEK or MIBK data.
Thickness, Length and Grip Choices
Most practical butyl rubber gloves sit between 0.35 mm and 0.70 mm, with common lengths of 300 mm, 350 mm and 380 mm. A 0.35 mm glove is a dexterity choice for laboratory decanting, sample handling, wipe-down and short splash contact, often under 10 minutes if the chemical data supports that use. A 0.50 mm glove is the middle specification for paint shop cleaning, solvent dispensing, drum sampling and maintenance tasks. A 0.70 mm glove gives more material reserve for waste solvent transfer and longer clean-down cycles, but workers lose fingertip feel and may reject it for pipettes, small valves, spray gun triggers and glassware. Cuff length is a safety decision, not a style option. A 300 mm glove can expose the wrist when the operator bends or reaches over a drum rim. For parts washers, spray gun cleaning, chemical decanting and waste handling, 350 mm or 380 mm is usually the better first sample. Grip options are limited compared with coated work gloves: smooth surface, light embossing, diamond-pattern palm and fingers, chlorinated finish for easier donning, or in some cases a cotton flock lining. We normally prefer unlined butyl or a separate washable liner for aggressive solvent work because flock can hold contaminated liquid and makes cleaning harder to verify. Do not specify foam nitrile breathability, sandy nitrile coating or a 15 gauge liner on a butyl chemical barrier glove; those belong to mechanical grip gloves, not ketone permeation control.
What Butyl Does Not Solve
Butyl is not the universal chemical glove. For engine oil, diesel, hydraulic fluid, grease and many aliphatic hydrocarbons, nitrile is usually cheaper, tougher and easier to source in disposable, unsupported or dipped chemical styles. For aromatic or chlorinated solvents such as toluene CAS 108-88-3, xylene CAS 1330-20-7, methylene chloride CAS 75-09-2 or trichloroethylene CAS 79-01-6, buyers may need fluoroelastomer, PVA for strictly water-free use, or laminate film gloves, but cost, dexterity loss and MOQ rise quickly. For caustic soda, battery acid, electroplating solution or general acid handling, neoprene, PVC, natural rubber or multilayer laminate may be better depending on concentration, temperature and contact time. Mechanical protection is also limited. A 0.70 mm butyl glove may have EN 388 abrasion, tear or puncture figures if tested, but it is not a cut glove and should not replace a 13 gauge HPPE, aramid or steel-fibre liner for sheet metal, blades or sharp scrap. When a job has both MEK exposure and cut risk, we usually separate the process: cut-resistant glove for dry handling, then butyl glove for the solvent stage. A thin liner under the butyl can help comfort, but it adds bulk and contamination risk. Asking for cut level C, high ketone resistance, 380 mm cuff, fine fingertip feel and low price in one glove usually creates a product workers avoid.
MOQ, Sampling and Price Reality
Butyl rubber gloves are slower and more expensive than commodity nitrile, latex household or PVC chemical gloves. For an existing black IIR compound and existing mould, a realistic MOQ is often 1,000 to 3,000 pairs per size per thickness, subject to line schedule and whether that compound is already being run. Custom colour, 420 mm length, non-standard cuff shape, private mould work, printed glove markings or special retail packaging can push MOQ higher and add tooling or plate cost. Sampling is normally 2 to 3 weeks when the mould, length and thickness exist. Bulk production is commonly 6 to 9 weeks after sample approval, artwork approval and deposit. Sea freight from China then adds about 3 to 6 weeks depending on destination port, vessel space and whether the shipment moves from Ningbo or Shanghai. Price depends on compound, thickness, length, test documents and packing. A 0.70 mm, 380 mm butyl glove packed one pair per polybag with user instruction sheet, barcode and private carton mark will cost materially more than a 0.35 mm, 300 mm bulk-packed laboratory glove. Inspection should cover visual defects, odour, powder or residue, pair weight, palm thickness and cuff thickness by micrometre, total length, cuff width, size marking, packing count, barcode scan and carton burst or crush resistance where required. AQL 2.5 major and AQL 4.0 minor is common for appearance inspection, but chemical leakage must follow EN 374-2 or an agreed air or water leak method. Visual AQL alone does not prove chemical barrier performance.
RFQ Details That Prevent a Bad Buy
A useful RFQ names the chemical and the use pattern. Write acetone 99 percent, splash exposure under 10 minutes, room temperature 20 to 25 C, 350 mm length, sizes 8, 9 and 10, rather than black solvent resistant glove. List MEK, MIBK, IPA, ethanol, acids, resin additives, pigments or cleaning blends if they are in the same process because mixed solvents can behave differently from single chemicals. State whether you need EN ISO 374-1:2016+A1:2018 Type A, EN 16523-1 reports for named chemicals, EN 374-5 microorganism protection, EN 388 mechanical data, CE technical documentation, UKCA documentation or only factory resistance information for internal industrial use. Put the commercial details in the first enquiry: size range, annual forecast, first order quantity, target packing, barcode format, carton mark, inspection level, Incoterm and destination port. Common quotation bases for this category include FOB Ningbo or FOB Shanghai. EXW only makes sense when the buyer controls China collection, export declaration and forwarder booking. A first butyl order rarely fills a 20 ft container alone, so many shipments move as LCL or consolidate with other PPE SKUs. The cleaner buying route is to approve one thickness, one length and one packing format, run a controlled trial order, collect worker feedback, then expand size split and private label only after the permeation data matches the actual job.
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