Chemical Resistant Gloves

Why Permeation Matters More Than You Think

Chemical permeation happens invisibly. A glove might look perfectly intact while methanol or toluene molecules pass through the material at molecular level, reaching your skin within minutes. You can't see it happening, which is exactly why EN 374 testing matters. Certified chemical resistant gloves are tested against 18 standard chemicals – methanol, acetone, dichloromethane, carbon disulfide, toluene, diethylamine, tetrahydrofuran, ethyl acetate, n-heptane, sodium hydroxide 40%, sulfuric acid 96%, nitric acid 65%, acetic acid 99%, ammonia 25%, hydrogen peroxide 30%, hydrofluoric acid 40%, formaldehyde 37%, and others – measuring exact breakthrough times. That's the moment chemicals first penetrate through to your skin. No guesswork. Just tested protection.

Degradation testing reveals another critical detail – it measures physical changes (swelling, hardening, cracking, colour change) that signal chemical attack on glove material. These visible changes warn you when to replace gloves. Penetration testing ensures gloves don't leak through manufacturing defects or pinholes when exposed to pressure. Together, these three tests define EN 374 certification.

Material Selection: Matching Chemistry to Protection

Nitrile (synthetic rubber) provides excellent protection against oils, greases, petroleum products, hydraulic fluids, most aliphatic solvents like hexane and heptane, and dilute acids or alkalis. This makes nitrile ideal for automotive work, general manufacturing, and laboratory applications. Nitrile gloves typically achieve EN 374 Type A or B certification with breakthrough times of 30-120 minutes for protected chemicals. However, nitrile degrades rapidly when exposed to ketones (acetone, MEK), strong oxidising acids (concentrated nitric or sulfuric), and aromatic solvents (benzene, toluene). There's no universal glove protecting against all chemicals – you must match material to your specific exposure.

Neoprene (polychloroprene synthetic rubber) offers broader chemical resistance than nitrile, protecting against acids, alkalis, alcohols, phenols, and some petroleum products, though it degrades with aromatic and chlorinated solvents. Neoprene works brilliantly for chemical manufacturing where workers handle multiple chemical families requiring versatile protection. Butyl rubber provides the highest resistance to ketones (acetone, MEK), esters, glycol ethers, and highly corrosive acids – essential for pharmaceutical manufacturing and chemical processing where ketone exposure is constant. Butyl typically achieves breakthrough times of 240-480+ minutes (Level 5-6) for protected chemicals, making it the choice when maximum dwell time matters.

Latex (natural rubber) suits water-based chemicals, dilute acids and alkalis, and biological hazards when EN 374-5 certified for microorganism protection, offering excellent dexterity for precision laboratory work. However, latex degrades rapidly with petroleum products, oils, and organic solvents. Some users experience allergic reactions requiring latex-free alternatives. Viton (fluoroelastomer) provides exceptional resistance to chlorinated solvents (trichloroethylene, perchloroethylene), aromatic hydrocarbons, and concentrated acids, though considerably higher cost means it suits specialised chemical handling only. PVC gloves offer economical protection against acids and alkalis but limited solvent resistance.

Understanding EN 374 Breakthrough Time Levels

EN 374 classification depends on breakthrough time – the minutes until chemical molecules first permeate through glove material reaching skin side. Level 1 represents greater than 10 minutes of protection. Level 2 extends beyond 30 minutes. Level 3 exceeds 60 minutes. Level 4 goes beyond 120 minutes. Level 5 surpasses 240 minutes. Level 6 provides 480+ minutes of protection. Higher levels don't automatically mean better – they mean longer protection for that specific chemical. A Level 6 butyl glove protecting against acetone is correct for pharmaceutical production where ketone exposure runs continuously. That same Level 6 glove protecting against a chemical you only handle occasionally is overspecification adding unnecessary bulk and cost.

Type A certification requires minimum Level 2 (30+ minutes) against at least 6 chemicals. Type B requires Level 2 against minimum 3 chemicals. Type C requires Level 1 (10+ minutes) against minimum 1 chemical. Always check the specific pictogram markings on your gloves indicating which chemicals from the test list they protect against – that tells you precisely which exposures the glove handles and for how long.

Glove Format and Practical Considerations

Chemical gauntlets extend 30-45cm length protecting forearms during tank cleaning, drum handling, or reaching into chemical baths where standard 30cm gloves leave arms exposed to splash and vapour. Flock-lined chemical gloves feature cotton interior absorbing perspiration maintaining comfort during extended wear (1-2 hours), whilst unlined gloves suit brief chemical exposure with frequent glove changes. Textured palm coatings (diamond grip, raised patterns) improve wet chemical handling preventing slippery containers from dropping.

Disposable chemical gloves (typically nitrile 0.15-0.20mm thickness) suit single-use tasks with brief chemical exposure, light chemical concentrations, or frequent glove changes preventing cross-contamination – replace after each task or 15-30 minutes continuous exposure. Reusable chemical resistant gloves (0.40-1.00mm+ thickness) withstand repeated use, extended exposure, and cleaning between tasks. Inspect reusable gloves for degradation (swelling, stiffness, colour change, tackiness) before each use, replacing immediately when damage appears. Wash with mild soap and water after each exposure, never with harsh solvents that accelerate degradation.

Maintenance, Replacement, and Chemical-Specific Guidance

Replace disposable gloves after single use. Replace reusable gloves after 50-100 uses or when you notice swelling, stiffening, colour changes, surface tackiness, or reduced flexibility indicating chemical degradation. Never exceed manufacturer's recommended breakthrough times for your specific chemicals – chemical permeation accelerates with temperature, mechanical stress, and chemical concentration variations. At elevated temperatures or under pressure, breakthrough times compress significantly. If you're handling warm solutions or working in high-temperature environments, specify gloves with higher Level ratings than your baseline temperature exposure would suggest.

Always reference manufacturer's chemical resistance charts matching your specific chemicals against glove breakthrough times – generic 'chemical resistant' claims aren't sufficient for safety. Different vendors' nitrile formulations perform differently against the same chemicals. Ansell chemical resistant gloves (Solvex, AlphaTec, TouchNTuff ranges) provide well-documented chemical resistance profiles. Portwest chemical gloves offer economical options meeting EN 374 standards. Wondergrip chemical gloves focus on ergonomic comfort alongside chemical protection.

You'll need EN 374 chemical resistant gloves if you're handling laboratory chemicals and reagents, mixing or applying industrial cleaning chemicals, servicing vehicles with oils and brake fluids, manufacturing or processing chemicals, pharmaceutical production, agricultural pesticide application, petrochemical operations, tank or drum cleaning, electroplating or surface treatment work, paint spraying or finishing, or any role involving skin contact risk with hazardous chemicals requiring tested barrier protection that standard work gloves cannot deliver.