Chemical Resistant Gloves: ASTM F903 & EN374 Permeation Guide (2026)

ASTM F903 vs EN374: Two Standards, One Goal

Chemical resistant gloves protect workers from substances that can burn skin on contact, absorb through skin into the bloodstream, or cause delayed dermatitis. Two testing frameworks dominate the global market: ASTM F903 (US) and EN374 (European). Both measure the same fundamental property — how long a glove material holds back a specific chemical before that chemical passes through — but they differ in methodology, reporting format, and classification system.

ASTM F903 is titled "Standard Test Method for Resistance of Protective Clothing Materials to Permeation by Liquids or Gases." It uses a two-chamber permeation cell: the challenge chemical sits on one side of the glove material, and an analytical instrument (typically a gas chromatograph or UV spectrophotometer) monitors the other side for chemical molecules. The test reports a single number — permeation breakthrough time in minutes — for each chemical tested. There is no pass/fail threshold and no tier classification. The buyer reads the number and decides if it is sufficient for their exposure scenario.

EN374-1:2016 ("Protective gloves against dangerous chemicals and micro-organisms — Part 1: Terminology and performance requirements for chemical risks") uses a similar permeation cell methodology but adds a classification layer. The standard defines a list of 18 challenge chemicals (from methanol to diethylamine) and classifies gloves into three tiers:

• Type A: Breakthrough time ≥ 30 minutes for at least 6 of 18 chemicals
• Type B: Breakthrough time ≥ 30 minutes for at least 3 of 18 chemicals
• Type C: Breakthrough time ≥ 10 minutes for at least 1 of 18 chemicals

The critical difference for procurement teams: ASTM F903 gives you granular data (breakthrough time for chemical X = 240 minutes), while EN374 gives you a classification (Type A — but you need to check the chemical list to see which 6 chemicals were tested). A glove labeled "EN374 Type A" without specifying which chemicals it was tested against is incomplete information. Always request the full test report.

Permeation Breakthrough Time: The Number That Matters

Permeation is the process by which a chemical passes through a protective glove material at the molecular level — not through a hole or tear, but through the material itself. It occurs in three stages: (1) absorption of chemical molecules into the outer surface of the glove, (2) diffusion of those molecules through the material matrix, and (3) desorption from the inner surface into contact with the skin.

Breakthrough time is defined as the elapsed time between initial chemical contact with the glove's outer surface and the first detectable amount of chemical on the inner surface. It is not the time until the glove fails visibly — the glove may look perfectly intact while chemical is already reaching skin. This is why permeation testing requires sensitive analytical instruments, not visual inspection.

For procurement and safety managers, breakthrough time is the single most important data point. But it comes with a critical caveat: the reported breakthrough time is from a laboratory test under controlled conditions (typically 23°C, continuous chemical contact). In real workplaces, factors like temperature, mechanical stress, chemical mixture, and glove age all affect actual performance. A glove rated for 240 minutes of breakthrough against pure toluene may fail in 60 minutes if the worker handles warm toluene (50°C) while gripping tools that stretch the glove material.

EN374 defines six performance levels based on measured breakthrough time:

Glove Materials & Chemical Compatibility

No single glove material protects against all chemicals. Each polymer has specific chemicals it resists well and others it fails against rapidly. Selecting the wrong material for a chemical hazard is the most common cause of chemical burn injuries in industrial settings. The five dominant chemical glove materials each have distinct compatibility profiles:

Nitrile (NBR)

Nitrile is the workhorse of chemical protective gloves — good mechanical strength, excellent abrasion resistance, and broad chemical resistance at moderate cost. Nitrile performs well against oils, greases, aliphatic hydrocarbons, and many diluted acids. It performs poorly against aromatic solvents (benzene, toluene, xylene), ketones (acetone, MEK), and strong oxidizing acids. For concentrated sulfuric acid or nitric acid, nitrile is not recommended. Nitrile gloves typically achieve EN374 Type A or Type B depending on thickness and formulation.

Neoprene (Polychloroprene)

Neoprene offers broader chemical resistance than nitrile, particularly against acids, alkalis, and some solvents. It maintains flexibility across a wide temperature range (-20°C to +90°C) and has good aging resistance. Neoprene excels against sulfuric acid (up to 50% concentration), hydrochloric acid, sodium hydroxide, and many alcohols. It is vulnerable to chlorinated solvents, aromatic hydrocarbons, and some ketones. Neoprene gloves typically cost 40-60% more than equivalent nitrile gloves.

Butyl Rubber

Butyl rubber is the premium choice for highly toxic chemicals and long-duration chemical immersion. It offers exceptional resistance to ketones, esters, and strong oxidizing agents — chemicals that destroy nitrile and neoprene in minutes. Butyl gloves achieve permeation breakthrough times exceeding 480 minutes against most chemicals in the EN374 test list. The trade-off is cost ($6-10/pair wholesale) and dexterity — butyl rubber is thicker and less flexible than nitrile, making fine manipulation difficult. Butyl is the standard choice for chemical warfare agent handling, emergency response, and laboratory work with highly toxic substances.

PVC (Polyvinyl Chloride)

PVC gloves offer good resistance to acids, alkalis, and some oils at low cost ($1.20-2.50/pair wholesale). PVC is commonly used in electroplating, metal treatment, and battery manufacturing where acid splash is the primary hazard. However, PVC has poor resistance to most organic solvents — plasticizers in the PVC compound can be extracted by solvents, causing the glove to become brittle and crack. PVC gloves are typically EN374 Type B or Type C, suitable for defined chemical splash scenarios but not for immersion.

Viton (Fluoroelastomer)

Viton gloves provide the highest resistance to aromatic solvents, chlorinated solvents, and gasoline/petroleum products. Viton is the material of choice for handling benzene, carbon tetrachloride, and trichloroethylene. However, Viton offers poor resistance to ketones, esters, and some amines — chemicals that butyl rubber handles well. Viton is expensive ($7-12/pair wholesale) and is typically reserved for specific solvent-handling applications where no other material provides adequate protection.

Breakthrough times in the table above are representative values from manufacturer technical data sheets and EN374 test reports. Actual values vary by glove thickness, formulation, and manufacturer. Always verify against the specific product's technical datasheet before specifying for a chemical hazard.

Chemical Selection Guide: Matching Glove to Hazard

Selecting a chemical resistant glove requires three pieces of information: (1) the exact chemical name and concentration, (2) the exposure type (splash, immersion, vapor), and (3) the task duration. Without all three, glove selection becomes guesswork.

For mixed chemical hazards — common in industrial cleaning, paint stripping, and waste handling — the glove must be rated for the most aggressive chemical in the mixture. A glove that handles 90% of the mixture's components but fails rapidly against the remaining 10% provides false confidence. If the mixture contains acetone (which destroys nitrile in 3 minutes) at even 5% concentration, a nitrile glove is the wrong choice regardless of what the other 95% is.

Temperature is an underappreciated factor. Permeation rates increase exponentially with temperature — a glove rated for 240 minutes at 23°C may break through in 60 minutes at 40°C. Chemical processes involving heated chemicals (hot acid baths, heated solvent reactors, steam cleaning) require gloves rated for the actual operating temperature, not the standard test temperature.

Degradation, Permeation & Penetration: Three Failure Modes

Chemical gloves fail in three distinct ways, and understanding the difference is essential for safety program design:

Permeation is the invisible diffusion of chemical molecules through intact glove material. There is no visible sign. The glove looks and feels normal, but chemical is reaching the skin. This is the most dangerous failure mode because workers have no sensory warning. Permeation is what EN374 and ASTM F903 test for.

Degradation is the visible deterioration of glove material caused by chemical attack. Symptoms include swelling, shrinking, hardening, stiffening, cracking, color change, or dissolution. Degradation is observable, but it often occurs after permeation has already begun — by the time you see degradation, chemical may have been reaching skin for some time. However, degradation is a clear signal to remove the glove immediately.

Penetration is the flow of chemical through physical openings in the glove — pinholes, tears, seams, or seal failures. Penetration is a mechanical failure, not a chemical one. A glove with excellent permeation resistance but a torn cuff provides zero protection. Penetration is addressed by glove integrity testing (inflation pressure test per EN374-2), visual inspection before use, and proper sizing.

EN374 addresses all three: Part 1 covers permeation and classification, Part 2 covers penetration resistance (leak testing), and Part 3 requires information on degradation to be included in the user instructions. A complete chemical glove specification should verify all three test results.

Sourcing Chemical Gloves from China: What Buyers Need

China dominates global chemical resistant glove manufacturing, with production clusters in Qingdao (nitrile and neoprene dip), Wuxi (butyl rubber), and Wenzhou (PVC and latex). For B2B buyers in Africa, Southeast Asia, and the Middle East, sourcing directly from a Chinese factory can reduce glove costs by 40-60% compared to European brand distribution channels. However, chemical glove sourcing requires more diligence than mechanical glove sourcing because the certification stakes are higher — a failed chemical glove can cause severe injury, while a failed mechanical glove typically causes minor injury.

Key due diligence steps when sourcing chemical resistant gloves from China:

• Request the full EN374 test report — not just the Type A/B/C label. The report should list each chemical tested, breakthrough time measured, and the test laboratory name (SATRA, BSI, Centexbel, or a certified Chinese lab like CTTC). A Type A label without the chemical-by-chemical data is incomplete — the glove may be Type A because it passed 6 chemicals that are not relevant to your application.
• Verify the Declaration of Conformity (DoC) — EU PPE Regulation 2016/425 requires a DoC for Category III gloves. The DoC must list the applicable standards (EN374-1, EN374-2, EN374-3, EN420), the notified body that assessed the type examination, and the product identification. Without a valid DoC, the CE mark is legally void.
• Check the notified body number — the CE mark on the glove or packaging must include the 4-digit number of the notified body that conducted the EU type examination (e.g., NB 2777 for SATRA, NB 0123 for ECRI). If the CE mark has no 4-digit number, the glove may be self-certified (Category I only, not Category III for chemical risks). Chemical gloves must be Category III.
• Audit factory QC for permeation testing — reputable factories maintain in-house permeation testing equipment for batch verification. Ask whether the factory conducts periodic batch testing or relies solely on the initial type examination certificate. Batch testing ensures consistency across production runs.
• Negotiate FOB pricing by volume tier — standard pricing tiers for EN374 Type A nitrile gloves: 500 pairs at $3.20-3.80/pair, 2,000 pairs at $2.80-3.20/pair, 5,000+ pairs at $2.40-2.80/pair. Butyl rubber gloves: 200 pairs at $8.50-9.50/pair, 1,000 pairs at $7.00-8.00/pair. Lead time: 30-45 days for standard models, 45-60 days for custom formulations.

For buyers targeting markets in Nigeria, Kenya, Indonesia, or the Philippines — where chemical industry growth is driving demand for PPE — the most common sourcing mistake is buying the cheapest EN374-labeled glove without verifying which chemicals were tested. A glove that costs $1.80/pair and claims "EN374 Type C" may only provide 10 minutes of protection against one chemical on the test list. For oil and gas, petrochemical, or mining applications, specify Type A with a minimum of 60-minute breakthrough for the specific chemicals in your operation.

Explore our full range of chemical resistant gloves on the products page, or review our complete blog index for more category-specific guides including neoprene chemical gloves, chemical splash gloves, and EN374 chemical gloves guide. The 2026 sourcing guide includes a full chapter on chemical glove compliance. For common questions about MOQ, shipping, and certification, see our FAQ page.