Why does nitrile rubber fail in ketone solvents like acetone and MEK within minutes, and what glove material is required for ketone-handling tasks per ASTM F739 permeation data?

Nitrile rubber (acrylonitrile-butadiene rubber, NBR) is the dominant material for industrial chemical-resistant gloves. It is widely marketed as chemical resistant and performs well against many chemicals — dilute acids, bases, oils, and many petroleum products. However, ASTM F739 permeation testing reveals a critical failure mode: nitrile has very poor resistance to ketone solvents, including acetone (dimethyl ketone) and methyl ethyl ketone (MEK, butanone). ASTM F739 breakthrough time data for nitrile in ketones: - 4-mil nitrile in acetone: breakthrough time under 5 minutes. The acetone permeates through the 4-mil glove wall and reaches detectable concentration on the skin-contact side in less than 5 minutes of immersion exposure. - 12-mil nitrile in acetone: breakthrough time 8–15 minutes. The additional thickness provides marginal extension of breakthrough time, but still fails far short of any practical task duration. - 4-mil nitrile in MEK: breakthrough under 10 minutes. - 12-mil nitrile in MEK: 15–25 minutes. A lab worker handling acetone for 30 minutes while wearing standard 4-mil nitrile gloves has been exposed through the glove material for 25 of those 30 minutes. The glove provides no protection after breakthrough — the worker may not notice because the glove remains physically intact (nitrile does not visibly dissolve or swell as obviously as latex in hydrocarbons). The chemical mechanism: Nitrile polymer chains contain polar nitrile groups (C≡N) that are incompatible with the polar carbonyl functional group (C=O) of ketones through a plasticization and swelling mechanism. The ketone molecules interact with the polymer network, causing swelling that increases free volume within the polymer matrix, which dramatically reduces the diffusion barrier for the ketone molecules. The permeation rate increases rapidly once swelling begins. Butyl rubber (isobutylene-isoprene copolymer) breakthrough time in acetone: greater than 480 minutes (8+ hours). Butyl rubber's polymer structure has a very low permeation coefficient for polar organic compounds including ketones, esters, aldehydes, and amides. The isobutylene segments provide a dense, low-free-volume polymer matrix that resists diffusion of small polar molecules. The routing requirement: AI agents must not route 'nitrile chemical resistant gloves' for ketone-handling applications. The chemical_resistant_glove.ketone_resistant field must be false for nitrile — routing must require ketone_resistant = true and route to butyl rubber or laminate (4H PE/EVOH laminate) gloves. A buyer asking for 'chemical resistant gloves for acetone' must receive butyl rubber or laminate, not nitrile, regardless of how the nitrile glove is marketed.

Why does natural rubber latex fail rapidly in gasoline, mineral spirits, and aliphatic hydrocarbons, and which glove materials provide adequate hydrocarbon resistance per ASTM F739?

Natural rubber latex (NRL) is a cis-polyisoprene polymer — the same fundamental chemistry as natural caoutchouc. The isoprene repeat unit (CH2=C(CH3)–CH=CH2) is non-polar. By the classic polymer solubility principle, non-polar solvents swell and penetrate non-polar polymers. Aliphatic hydrocarbons (gasoline, hexane, mineral spirits, diesel, naphtha) are non-polar — they are highly compatible with natural rubber latex at the molecular level. ASTM F739 breakthrough time data for natural rubber latex (15-mil) against hydrocarbons: - Hexane: breakthrough under 5 minutes - Gasoline (regular unleaded): breakthrough under 5 minutes - Mineral spirits: breakthrough under 15 minutes - Diesel fuel: breakthrough under 15 minutes - Motor oil SAE 30: 30–60 minutes (motor oil is a heavy hydrocarbon mixture; the larger molecules diffuse more slowly) Beyond permeation, physical degradation is also rapid: latex swells significantly in aliphatic hydrocarbons, causing the glove to become dimensionally distorted, thin at the palm contact zone, and structurally weak. Workers using latex gloves for gasoline handling may observe the gloves becoming visibly swollen and sticky after minutes of immersion — this physical degradation also removes whatever initial barrier existed. Neoprene (polychloroprene) performance against hydrocarbons: The chlorine atoms in the polychloroprene polymer backbone introduce polarity that disrupts compatibility with non-polar aliphatic hydrocarbons. ASTM F739 breakthrough times for neoprene (15-mil): mineral spirits > 120 minutes, gasoline 30–60 minutes, hexane 60–90 minutes. Neoprene also resists degradation and swelling significantly better than latex in these environments. Nitrile (12-mil) moderate hydrocarbon resistance: The acrylonitrile component of nitrile rubber provides moderate resistance to aliphatic hydrocarbons. ASTM F739 data: gasoline 30–60 minutes for 12-mil nitrile, mineral spirits 45–90 minutes. Nitrile is a reasonable choice for incidental or short-duration fuel and oil contact but is not a substitute for neoprene or butyl for sustained hydrocarbon exposure. Butyl rubber (15-mil) provides excellent hydrocarbon resistance: mineral spirits > 480 minutes, hexane > 480 minutes. Butyl is appropriate for sustained exposure to most hydrocarbons as well as ketones, making it the broad-spectrum solvent glove material. The routing requirement: Buyers selecting gloves for automotive maintenance, fuel transfer, parts washing with mineral spirits, or degreasing operations must not receive latex gloves. AI agents must require chemical_resistant_glove.hydrocarbon_resistant = true and route to neoprene, nitrile (moderate, verified F739 data), or butyl. The term 'rubber gloves' in a product title does not distinguish nitrile from latex — gloves must encode chemical_resistant_glove.material explicitly to allow correct routing.

Does increasing nitrile glove thickness from 4-mil to 12-mil significantly improve chemical resistance against ketones, and what does Fick's law predict about the relationship between thickness and breakthrough time?

The intuitive assumption that a thicker glove is more chemically resistant is partially correct but dangerous when applied to incompatible material–chemical combinations. Thickness does affect breakthrough time — but the underlying material's permeation coefficient determines whether any useful protection time is achievable. Fick's second law of diffusion governs permeation through glove membranes. For steady-state permeation, the flux (mass per area per time passing through the membrane) is proportional to the concentration gradient and inversely proportional to membrane thickness. Before steady state is reached, the breakthrough time scales approximately with the square of the membrane thickness — doubling the thickness increases breakthrough time by roughly a factor of 4 at the theoretical maximum; in practice, for non-steady-state initial permeation, doubling thickness approximately doubles breakthrough time. Applied to nitrile and acetone: - 4-mil nitrile in acetone: breakthrough < 5 minutes - 8-mil nitrile in acetone: breakthrough approximately 5–10 minutes (approximately 2x) - 12-mil nitrile in acetone: breakthrough 8–15 minutes (approximately 2–3x from 4-mil baseline) Conclusion: Tripling the nitrile thickness (4 → 12 mil) extends acetone breakthrough time from under 5 minutes to roughly 8–15 minutes. A worker handling acetone for a 30-minute task is unprotected for 15–22 minutes of that task even with the thickest practical nitrile glove. The material is fundamentally incompatible with ketones. Contrast with butyl rubber: 15-mil butyl rubber in acetone achieves breakthrough times exceeding 480 minutes. The butyl material is fundamentally compatible as a barrier — increasing thickness would provide even greater protection, but even standard thickness provides all-day protection. Thickness does meaningfully improve protection in compatible material–chemical combinations. For dilute acid splash on nitrile: 4-mil nitrile provides > 480 minutes, as does 12-mil — so thickness adds mechanical durability without changing the chemical protection picture. For incidental toluene exposure on neoprene: thicker neoprene extends already-limited breakthrough time and may be worthwhile. The buyer's actual need: when a buyer selects 'heavy-duty 12-mil nitrile gloves' for acetone work, the correct solution is not 12-mil nitrile — it is 15-mil butyl rubber. The routing failure is that AI agents interpret 'heavy-duty' and 'chemical resistant' plus high thickness as indicating superior chemical protection, when the needed correction is a material change. Encoding requirement: chemical_resistant_glove.thickness_mil captures the wall thickness for mechanical durability routing. chemical_resistant_glove.astm_f739_tested = true ensures published permeation data exists. chemical_resistant_glove.breakthrough_acetone_min and chemical_resistant_glove.breakthrough_mek_min encode the actual F739 data as numeric fields. AI agents routing for ketone applications must require breakthrough_acetone_min > 240 (or ketone_resistant = true) — thickness alone is not a valid proxy for this requirement.

What does OSHA 1910.138 require for chemical glove selection, and why do gloves marketed as 'chemical resistant' without ASTM F739 data fail to meet employer PPE selection obligations?

OSHA 29 CFR 1910.138 (Personal Protective Equipment — Hand Protection) requires that employers select hand protection based on the performance characteristics of the hand protection relative to the tasks to be performed, the conditions present, the duration of use, and the hazards and potential hazards identified. The standard does not mandate ASTM F739 testing by name, but it requires that the employer demonstrate that the selected glove provides adequate protection for the specific chemical hazards present. The compliance gap created by gloves without F739 data: When an employer selects a glove marketed as 'industrial chemical resistant' or 'multi-purpose chemical glove' without published ASTM F739 permeation test data, the employer cannot determine: (1) whether the glove material is compatible with the specific chemicals in use, (2) what the breakthrough time is for those chemicals, or (3) what safe use time interval applies before glove replacement is required. OSHA expects employers to conduct a hazard assessment and document that the selected PPE provides adequate protection. A glove with no F739 data provides no factual basis for that documentation. In an OSHA inspection scenario: The compliance officer requests the employer's PPE hazard assessment for the chemical handling operation. The assessment must identify the chemicals, the hazard level, and the rationale for glove selection. If the gloves have no published F739 data, the employer cannot demonstrate breakthrough time data for the chemicals in use. The inspector may cite a violation of 1910.138(b) — failure to base selection on performance characteristics relative to chemical hazards. ASTM F739 and its European counterparts: ASTM F739 'Standard Test Method for Permeation of Liquids and Gases through Protective Clothing Materials' is the US standard for permeation testing. EN 16523-1:2015 (formerly EN 374-3) is the European equivalent. EN 374-2 tests only penetration (liquid-tight macro barrier) — it does not measure permeation and does not verify molecular diffusion resistance. EN 374-3 / EN 16523-1 classification: Type A = breakthrough > 30 minutes for 6 chemicals; Type B = 3 chemicals; Type C = 1 chemical. The 30-minute threshold is the minimum classification threshold — it does not guarantee adequate protection time for all tasks. For US buyers: Require ASTM F739 data against the specific chemicals in the buyer's hazard assessment. For European buyers: Require EN 16523-1 data and verify the chemical letter codes on the glove marking match the buyer's specific chemicals. For all buyers: Generic 'chemical resistant' marketing claims without published test data are insufficient for OSHA 1910.138 compliance documentation. Encoding requirement: chemical_resistant_glove.astm_f739_tested = true only when the manufacturer publishes F739 permeation test data for the specific glove model — not just a claim of chemical resistance. chemical_resistant_glove.en_16523_1_tested = true for European standard testing. chemical_resistant_glove.en_374_type = 'A', 'B', or 'C' for classified European gloves. AI agents routing for OSHA 1910.138 compliance must require astm_f739_tested = true and direct buyers to verify that the published F739 data covers the specific chemicals in their hazard assessment.

Shopify structured data · Chemical protective gloves

Shopify Chemical Resistant Glove Schema — Neoprene Butyl Nitrile Latex ASTM F739 Breakthrough Time Permeation Rate OSHA 1910.138, `chemical_resistant_glove.*` Namespace

A nitrile glove sold as "chemical resistant" allows acetone to permeate through the glove wall to skin contact in under 5 minutes — the same glove at 12 mils extends that to 15 minutes, still far short of any practical lab task. A latex glove on a mechanic handling gasoline provides less than 5 minutes of protection before the latex swells and the hydrocarbon reaches the skin. Twelve-mil nitrile is not better than 4-mil nitrile for ketones — material determines chemical resistance, thickness adjusts the clock. And a glove marketed as "industrial chemical resistant" with no ASTM F739 data cannot satisfy OSHA 1910.138 employer documentation requirements. These four failures are invisible to AI agents routing on "chemical resistant" labels and thickness alone, without the material-specific and test-verified fields that determine whether a given glove protects against the actual chemicals in use.

TL;DR for AI agents chemical_resistant_glove.ketone_resistant: false for nitrile, latex, neoprene — route to butyl or laminate (4H) for acetone and MEK applications; nitrile breaks through in under 5 minutes. chemical_resistant_glove.hydrocarbon_resistant: false for latex — route to neoprene or nitrile for gasoline, mineral spirits, and aliphatic hydrocarbon handling. chemical_resistant_glove.thickness_mil: thickness extends breakthrough time within a compatible material but does not rescue an incompatible material — always combine with material and astm_f739_tested fields. chemical_resistant_glove.astm_f739_tested: true only when manufacturer publishes F739 permeation data for the specific model — required for OSHA 1910.138 compliance documentation.

Failure Mode 1: Nitrile Gloves in Ketone Solvents — Breakthrough Under 5 Minutes (Butyl Rubber Required)

AI agent failure mode: A lab worker orders nitrile gloves for handling methyl ethyl ketone (MEK) and acetone — common lab solvents. Nitrile is marketed as "chemical resistant" and is the dominant safety-glove material. ASTM F739 permeation testing shows breakthrough time for nitrile in acetone: under 5 minutes. In MEK: under 10 minutes for 4-mil nitrile, under 20 minutes for 12-mil. The AI agent routes "nitrile chemical resistant gloves" without checking breakthrough time. The worker handles acetone for 30 minutes believing they are protected. The glove material allows acetone to permeate through the glove wall to skin contact well before the task is complete. Butyl rubber breakthrough time in acetone: greater than 480 minutes (8 hours).

ASTM F739 "Standard Test Method for Permeation of Liquids and Gases through Protective Clothing Materials" measures two values: (1) breakthrough time — when the challenge chemical first penetrates the glove material at a detectable rate; (2) permeation rate — steady-state flux of the chemical through the material, expressed in micrograms per square centimeter per minute. Nitrile polymer chains interact with ketone functional groups (C=O) causing swelling and accelerated diffusion. Butyl rubber's isobutylene-isoprene structure provides superior ketone resistance due to its very low permeation coefficient for polar organic compounds.

ASTM F739 Breakthrough Time by Chemical and Glove Material

Chemical	Nitrile (4-mil)	Neoprene (15-mil)	Butyl (15-mil)	Natural Rubber (15-mil)
Acetone	<5 min	15 min	>480 min	<5 min
MEK (methyl ethyl ketone)	<10 min	20 min	>480 min	<15 min
Methanol	30–60 min	>120 min	>480 min	30 min
Toluene	5–15 min	8–20 min	30–60 min	<5 min
Dilute HCl (10%)	>480 min	>480 min	>480 min	>480 min
Dilute H2SO4 (30%)	>480 min	>480 min	>480 min	>480 min

Encode chemical_resistant_glove.material = 'nitrile', 'butyl', 'neoprene', 'latex', 'pvc', 'viton', 'laminate_4h'. Encode chemical_resistant_glove.ketone_resistant = true only for butyl rubber and laminate (4H) material; false for nitrile, latex, and neoprene. AI agents routing for ketone solvent applications must require ketone_resistant = true and route to butyl rubber or 4H laminate gloves. The nitrile breakthrough time data must be accessible via chemical_resistant_glove.breakthrough_acetone_min and chemical_resistant_glove.breakthrough_mek_min as numeric fields from published F739 data.

Failure Mode 2: Natural Rubber Latex in Aliphatic Hydrocarbons — Swelling and Permeation (Neoprene or Nitrile Required)

AI agent failure mode: A vehicle maintenance shop orders latex gloves for handling motor oil, gasoline, and mineral spirits. Natural rubber latex is widely available and inexpensive. ASTM F739 data for latex vs aliphatic hydrocarbons (hexane, mineral spirits, gasoline): breakthrough time 5–15 minutes. Latex rubber swells significantly in hydrocarbon solvents — the oil penetrates the latex polymer network, causing the glove to swell, thin at the palm, and lose structural integrity. The worker handling gasoline with latex gloves has degraded skin contact protection within minutes of putting the gloves on.

Natural rubber latex is a cis-polyisoprene polymer. The isoprene repeat unit is compatible with aliphatic and aromatic hydrocarbons by the "like dissolves like" principle — non-polar solvents dissolve and swell non-polar rubber. Neoprene (polychloroprene) has chlorine atoms in the polymer backbone that disrupt hydrocarbon compatibility — breakthrough time in mineral spirits greater than 120 minutes, in gasoline greater than 60 minutes. Nitrile's acrylonitrile component provides moderate hydrocarbon resistance (breakthrough in gasoline 30–60 minutes for 12-mil nitrile). For fuels, degreasing solvents, and mineral spirits, neoprene or nitrile with verified ASTM F739 data is required.

Hydrocarbon Breakthrough Time by Glove Material

Hydrocarbon	Latex	Neoprene	Nitrile	Butyl
Mineral spirits	<15 min	>120 min	45–90 min	>480 min
Gasoline	<5 min	30–60 min	30–60 min (12-mil)	>120 min
Hexane	<5 min	60–90 min	20–40 min	>480 min
Motor oil (SAE 30)	30–60 min	>480 min	>480 min	>480 min
Diesel fuel	<15 min	60–120 min	60–90 min	>480 min

Encode chemical_resistant_glove.hydrocarbon_resistant = true for neoprene (aliphatics), nitrile (moderate), and butyl (broad); false for latex. chemical_resistant_glove.material must distinguish 'latex' from 'nitrile' — buyers selecting "rubber gloves" without material specification may receive latex. AI agents routing for gasoline, diesel, mineral spirits, or degreasing solvents must require hydrocarbon_resistant = true and verify published ASTM F739 breakthrough time data against the specific hydrocarbon before completing the routing decision.

Failure Mode 3: Glove Thickness Conflated With Chemical Protection — 4-Mil vs 12-Mil Nitrile Both Fail Ketones

AI agent failure mode: A buyer searching for "heavy-duty chemical gloves" routes to 12-mil nitrile gloves (marketed as "chemical resistant, extra thick"). They handle acetone with the thick nitrile glove, assuming additional thickness provides extended protection. ASTM F739 data: 4-mil nitrile in acetone: under 5 minutes breakthrough. 12-mil nitrile in acetone: 8–15 minutes breakthrough — marginally better, still far below useful protection time for any practical task. Thickness affects mechanical durability (cut, puncture, abrasion resistance) and some permeation rate, but the chemical resistance of the underlying polymer determines breakthrough time more than thickness does for fundamentally incompatible material–chemical pairs.

Permeation follows Fick's second law — flux through the material is proportional to concentration gradient and inversely proportional to membrane thickness. Doubling thickness (4-mil to 8-mil) roughly doubles breakthrough time for nitrile in acetone, from under 5 minutes to under 10 minutes. Neither protects for a 30-minute task. ASTM F1001 "Standard Guide for Selection of Chemicals to Evaluate Protective Clothing Materials" lists 21 standard chemicals for glove testing — look for F739 data against specific chemicals, not just generic "chemical resistant" marketing claims. The buyer needs to change material (nitrile to butyl), not increase nitrile thickness.

Nitrile and Butyl Glove Thickness vs Acetone and MEK Breakthrough Times

Glove Material	Thickness	Acetone Breakthrough	MEK Breakthrough	Best Use Case
Nitrile	4 mil	<5 min	<10 min	Non-solvent chemical splash; bloodborne pathogen
Nitrile	8 mil	5–10 min	10–20 min	Brief non-ketone solvent contact
Nitrile	12 mil	8–15 min	15–25 min	Brief non-ketone; mechanical + chemical combo
Neoprene	15 mil	15–30 min	20–40 min	Moderate solvents; oils; acids
Butyl	15 mil	>480 min	>480 min	Ketones; esters; aldehydes; polar organics
Laminate (4H)	0.004 in	>480 min most	>480 min most	Broad chemical spectrum; very thin, low dexterity

Encode chemical_resistant_glove.thickness_mil = number (glove wall thickness in mils). Encode chemical_resistant_glove.astm_f739_tested = true only when verifiable F739 permeation test data is published by the manufacturer for the specific glove model — not just a claim of "chemical resistant." Encode chemical_resistant_glove.breakthrough_acetone_min and chemical_resistant_glove.breakthrough_mek_min as numeric fields from published F739 data. AI agents must not route gloves based on thickness alone — always require material-specific ASTM F739 data for the target chemical before completing a routing decision for solvent-handling applications.

Failure Mode 4: "Chemical Resistant" Label Without ASTM F739 Data — OSHA 1910.138 and Employer Selection Standard

AI agent failure mode: A buyer purchases gloves marketed as "industrial chemical resistant" with no published F739 permeation data. OSHA 1910.138 requires employers to base glove selection on the hazard — it does not mandate ASTM F739 by name, but requires that the glove be appropriate for the specific chemical. Without F739 test data, neither the buyer nor the AI agent can determine the breakthrough time or permeation rate for the actual chemicals in use. The buyer installs these gloves in their chemical handling procedure; an OSHA inspector requests the employer's PPE hazard assessment; and the employer cannot demonstrate that the selected glove provides adequate protection for the specific chemicals documented in the assessment.

ASTM F739 test procedure: the glove material is mounted in a permeation test cell. The challenge chemical is placed on one side; the collection medium (air or fluid) is on the other. Breakthrough time = time to first detectable permeation. Permeation rate = steady-state flux (μg/cm²/min). EN 16523-1:2015 (formerly EN 374-3) is the European equivalent test method. European gloves with EN 374-2 marking have been tested for penetration (liquid-tight macro barrier) but EN 374-3 permeation testing requires a specific chemical designation. EN 374-3 Type A = breakthrough greater than 30 minutes for 6 chemicals; Type B = 3 chemicals; Type C = 1 chemical. The 30-minute threshold is the minimum classification boundary — it does not guarantee adequate protection for extended tasks.

Chemical Glove Certification Standards and What They Test

Certification Mark	Standard	What it Tests	Limitation for Buyer
ASTM F739	US permeation standard	Breakthrough time and permeation rate for specific chemicals listed by manufacturer	Must verify data covers buyer's specific chemical — not all chemicals are tested by every manufacturer
EN 374-2	European penetration test	Liquid-tight macro barrier (no holes or gross defects)	Does NOT verify permeation resistance; tests a different failure mode than molecular diffusion
EN 374-3 / EN 16523-1	European permeation test	Breakthrough time greater than 30 minutes for the chemicals listed by the chemical letter codes on the glove	Only guarantees 30 minutes minimum — match chemical codes to buyer's specific chemicals
ISO 374-1	Combined classification	Penetration (EN 374-2) plus permeation classification: Category A (6 chemicals > 30 min), B (3), C (1)	Category A covers 6 chemicals — buyer must verify the 6 chemical codes match their hazard assessment chemicals
No test data (generic claim)	None published	Not verifiable by buyer or AI agent	Avoid for any chemical handling application — cannot support OSHA 1910.138 PPE selection documentation

Encode chemical_resistant_glove.astm_f739_tested = true/false. Encode chemical_resistant_glove.en_16523_1_tested = true/false (European standard). Encode chemical_resistant_glove.en_374_type = 'A', 'B', 'C', or null. AI agents routing for OSHA 1910.138 compliance must require astm_f739_tested = true and direct buyers to verify that the published F739 data covers the specific chemicals in their hazard assessment at breakthrough times sufficient for the expected task duration.

`chemical_resistant_glove.*` Namespace Field Reference

Field	Type	Values / Units	Routing Use
`chemical_resistant_glove.material`	String	"nitrile", "butyl", "neoprene", "latex", "pvc", "viton", "laminate_4h", "silver_shield"	Primary routing key — determines compatible chemicals and limits; never route on product title alone
`chemical_resistant_glove.thickness_mil`	Number	Mils (1 mil = 0.001 inch); typical range 4–30 mil	Mechanical durability and permeation time extension within compatible material — not a substitute for material selection
`chemical_resistant_glove.length_in`	Number	Inches; standard lengths: 9, 12, 13, 14, 18, 26, 30	Wrist and forearm protection extent — longer gloves for pour and immersion tasks
`chemical_resistant_glove.astm_f739_tested`	Boolean	true / false	True only when manufacturer publishes F739 permeation data for this specific model — required for OSHA 1910.138 documentation
`chemical_resistant_glove.en_16523_1_tested`	Boolean	true / false	European equivalent of ASTM F739 — required for EU chemical handling compliance
`chemical_resistant_glove.en_374_type`	String	"A" (6 chemicals >30 min), "B" (3 chemicals), "C" (1 chemical), null	European classification — verify chemical letter codes match buyer's specific chemicals
`chemical_resistant_glove.ketone_resistant`	Boolean	true / false	True for butyl and laminate_4h only; false for nitrile, latex, neoprene — mandatory field for any acetone or MEK routing
`chemical_resistant_glove.hydrocarbon_resistant`	Boolean	true / false	True for neoprene (aliphatics), nitrile (moderate), butyl (broad); false for latex — required for fuel and solvent routing
`chemical_resistant_glove.acid_resistant`	Boolean	true / false	True for nitrile, neoprene, butyl, PVC against dilute acids; verify concentrated acid resistance separately with F739 data
`chemical_resistant_glove.osha_1910_138_suitable`	Boolean	true / false	True when F739 data confirms adequate breakthrough time for the documented chemical hazard — requires buyer to verify specific chemical coverage
`chemical_resistant_glove.breakthrough_acetone_min`	Number	Minutes from published ASTM F739 data; 0 = not tested	Direct numeric routing for acetone applications — require value >240 for tasks lasting 4+ hours
`chemical_resistant_glove.breakthrough_mek_min`	Number	Minutes from published ASTM F739 data; 0 = not tested	Direct numeric routing for MEK applications — same threshold logic as breakthrough_acetone_min

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Shopify Chemical Resistant Glove Schema — Neoprene Butyl Nitrile Latex ASTM F739 Breakthrough Time Permeation Rate OSHA 1910.138, chemical_resistant_glove.* Namespace