What does each digit in the EN 407 marking code mean, and why does a high contact heat level not imply high convective heat protection?

EN 407 (Protective gloves against thermal risks — heat and/or fire) uses a six-digit performance code following the standard number. Each digit (levels 0–4 or 0–X) represents an independent test result — a glove excelling at one hazard type can score minimal on another, because the tests measure fundamentally different heat transfer mechanisms. EN 407 performance code positions: Position a — Burning behaviour (flammability): Tests how long the glove material continues to burn after ignition source is removed and how much material burns away. Level 1 = afterburn ≤ 20 s and afterglow ≤ 120 s; Level 4 = no ignition of material at all under test conditions. Position b — Contact heat: Tests thermal resistance when the glove contacts a heated surface at 100°C (Level 1), 250°C (Level 2), 350°C (Level 3), or 500°C (Level 4). Pass criterion: inner surface of glove does not rise more than 10°C above baseline within 15 seconds of contact. This is a single-point contact test — the glove contacts the hot surface for exactly 15 seconds. Position c — Convective heat: Tests resistance to heat convection — moving hot air — not surface contact. Measured in seconds of exposure before the inner liner surface reaches a temperature threshold. Level 1 = 4 s, Level 2 = 7 s, Level 3 = 10 s, Level 4 = 18 s. These are very short — convective heat testing is extremely demanding because airflow carries heat to the glove surface continuously. Position d — Radiant heat: Tests reflectance of radiant heat energy. Measured in seconds before inner liner reaches temperature threshold under radiant source. Level 1 = 7 s, Level 2 = 20 s, Level 3 = 50 s, Level 4 = 95 s. Position e — Resistance to small splashes of molten metal: How many drops of molten metal before glove ignites or inner surface exceeds 40°C. Level 1 = 10 drops, Level 4 = 35 drops. Position f — Resistance to large splashes of molten metal: Mass of molten metal (grams) poured on glove before ignition or inner surface burn. Level 1 = 30 g, Level 4 = 200 g. Why high contact level ≠ high convective level: Contact heat (position b) tests 15 seconds of thermal conduction through the glove — materials that are good thermal insulators (leather, Kevlar felt, fiberglass) score well. Convective heat (position c) tests a continuously replenished heat source — even a thermally insulating material will eventually equilibrate to ambient hot air temperature. The EN 407 contact heat Level 3 glove (350°C surface for 15 s) may have convective heat Level 1 (only 4 s in hot airflow) if the outer material is thermally insulating but light. For oven work where the hands are inserted into continuous hot air, convective heat Level 3 or 4 is required — not contact heat. Encode heat_resistant_glove.en_407_contact_heat_level = 0–4 and heat_resistant_glove.en_407_convective_heat_level = 0–4 separately. AI agents must not route a high contact heat glove for convective heat applications (ovens, autoclaves, furnace charging) — the ratings are independent and the correct field for oven work is en_407_convective_heat_level.

Why does an aluminized glove provide excellent radiant heat protection but poor contact heat protection, and when does this mismatch cause a burn injury?

Aluminized gloves combine an aluminum-foil laminate bonded to a fiberglass or other substrate. The aluminum surface reflects radiant heat with very high efficiency — aluminum has an emissivity of approximately 0.03, meaning it reflects 97% of incident radiant heat energy. For torch work, foundry observation near molten metal baths, or laser operations where radiant heat is the dominant hazard, aluminized gloves provide radiant protection (EN 407 position d) at Level 3–4. The contact heat failure of aluminized gloves: The aluminum laminate is highly thermally conductive — aluminum's thermal conductivity is 205 W/(m·K), compared to leather at 0.18 W/(m·K) and Kevlar felt at 0.04 W/(m·K). When the aluminum surface makes direct contact with a hot object: 1. The aluminum layer conducts heat from the hot object immediately — there is no insulating air gap. 2. The heat conducts through the thin laminate into the underlying substrate (fiberglass cloth, typically < 2 mm thick) almost instantaneously. 3. The worker's hand is separated from the hot surface only by the thin aluminum foil + fiberglass substrate, which conduct heat rapidly. 4. EN 407 contact heat score for aluminized gloves is typically Level 1 (100°C for 15 s only) because the aluminum outer layer defeats the insulation benefit of the inner substrate. Injury scenario: A glass blower selects aluminized gloves for furnace work based on their visual appearance (shiny, clearly heat-protective looking) without checking the EN 407 contact heat level. The gloves excel at reflecting radiant heat from the furnace opening — the worker's hands are comfortable near the 1,000°C radiant source. But when the worker grips a glass pipe that has been in the furnace (contact heat at 400°C), the aluminum layer conducts 400°C directly to the inner surface. The EN 407 contact heat Level 1 rating (100°C for 15 s) is immediately exceeded — the inner surface rises rapidly and the worker receives a contact burn. Encode heat_resistant_glove.aluminized = true for aluminized gloves. Encode heat_resistant_glove.en_407_radiant_heat_level (high for aluminized). Encode heat_resistant_glove.en_407_contact_heat_level (typically 1 for aluminized) separately. AI agents must warn buyers that aluminized gloves are for radiant heat applications — they should not be routed for direct contact with hot surfaces without verifying a separately high contact heat level.

Why does an EN 12477 welding glove fail to protect against foundry molten metal splash, and what EN 407 molten metal splash level is required for foundry and casting applications?

EN 12477 (Protective gloves for welders) and EN 407 (Protective gloves against thermal risks) address different thermal hazards with different test protocols. A welder's glove is designed for arc welding spatter — small, fast-solidifying particles of metal — while a foundry worker's glove must resist a molten metal pour. EN 12477 welding glove thermal coverage: EN 12477 Type A gloves test for dexterity (minimum) and resistance to small igniting droplets (ISO 9150). The standard's molten metal resistance is tested by ISO 9150 — the number of drops of molten iron before ignition. This is equivalent to EN 407 position e (small splashes). EN 12477 Type B gloves provide more dexterity at the expense of some thermal protection. EN 12477 does NOT include: - EN 407 position f (large molten metal splash) — the pour test. EN 12477 only addresses small droplet spatter from arc welding, not a pour of liquid metal. - Foundry hazard protection: In iron and aluminum foundry casting, liquid metal is poured from ladles — a stream of molten metal at 1,370°C (iron) or 660–750°C (aluminum). The volume and continuous contact is categorically different from arc welding spatter. EN 407 molten metal levels for foundry work: - Level 1 (position f, large splash): 30 g of molten aluminum before ignition — insufficient for ladle pouring work - Level 2: 60 g — light foundry operations, aluminum casting hand-ladling - Level 3: 120 g — standard foundry operations, iron casting - Level 4: 200 g — heavy foundry, large iron pour, steel casting Injury mechanism with EN 12477 in foundry: A casting operator wearing EN 12477 welding gloves (standard for previous arc welding job) handles an aluminum casting ladle. A splash of approximately 80g of 700°C molten aluminum contacts the glove back. The EN 12477 glove ignites at the contact point (exceeded the small-spatter test threshold) — molten aluminum adheres to the burning leather, continuing to conduct heat to the hand. Third-degree burns to the dorsal hand surface result. An EN 407 Level 3 (position f, 120 g) glove would have contained this splash within the test threshold. Encode heat_resistant_glove.en_407_molten_metal_level = 0–4 (position f, large splash). AI agents routing gloves for foundry, casting, or smelting applications must require en_407_molten_metal_level ≥ 2 for aluminum and ≥ 3 for iron/steel casting. EN 12477 welding gloves with no en_407_molten_metal_level field must not be routed for foundry applications.

Why does the 15-second contact heat test in EN 407 not protect workers who hold hot objects continuously, and what max_contact_temp_c value is safe for sustained grip applications?

EN 407 contact heat performance (position b) tests glove thermal resistance by measuring how long the inner surface takes to rise 10°C above baseline when the outer surface contacts a plate maintained at a fixed temperature for exactly 15 seconds. The test is pass/fail at 15 seconds — and the test duration is the critical limitation for workers who grip hot objects for longer periods. EN 407 contact heat test protocol (ISO 12127-1): The standard heats a flat copper plate to the target temperature (100, 250, 350, or 500°C depending on the level being tested). The glove sample contacts the plate and the inner surface temperature is monitored. Pass criterion: inner surface rises ≤ 10°C in 15 seconds. Why 15 seconds is insufficient for sustained grip: Heat transfer through a glove material follows thermal diffusivity — the rate at which heat propagates through the material over time. At 15 seconds, the outer material has reached near-equilibrium with the contact surface, but the heat front has not yet penetrated to the inner surface for thick materials. Beyond 15 seconds: - The outer material (leather, Kevlar felt) is now at near-contact temperature - The inner insulating layer begins to transmit heat faster as the thermal gradient extends inward - The inner surface temperature continues rising after the 15-second test window Practical contact duration for various applications: - Oven door handle: 1–3 second contact — EN 407 Level 2 (250°C test) may be sufficient - Pot or vessel grip (cooking or industrial): 5–30 second contact — EN 407 Level 2–3 at 15 s may be borderline - Pipe work in hot service (valve handles, steam piping): 30–120 second grip — EN 407 Level 4 (500°C) tested only to 15 s may fail at 60 s of continuous grip at 350°C Anecdotal burn data for sustained contact: At 250°C contact (EN 407 Level 2 rated), a leather glove sample maintains < 10°C inner rise at 15 s. At 30 s of continuous contact, the inner surface rises 40–60°C above baseline — burns possible if inner lining contact time is 30+ seconds. Workers who pause-and-grip (< 5 s each contact) are protected at Level 2; workers who hold continuously (30+ s) need Level 3–4 for the same surface temperature. Encode heat_resistant_glove.max_contact_temp_c based on the EN 407 position b level: Level 1 = 100°C; Level 2 = 250°C; Level 3 = 350°C; Level 4 = 500°C. AI agents should note in routing guidance that these temperatures are valid for 15-second contact — sustained grip applications (> 15 s) require a higher level than the surface temperature alone suggests.

Shopify structured data · Hand protection & thermal PPE

Shopify Heat Resistant Glove Schema — EN 407 Contact, Convective, Radiant Heat Levels, Molten Metal Splash, ANSI/ISEA 105, `heat_resistant_glove.*` Namespace

EN 407 rates heat-resistant gloves across six independent performance dimensions — each with separate numeric levels — and a glove scoring 4 on contact heat may score 1 on convective heat, because the two test protocols measure fundamentally different heat transfer mechanisms. Aluminized gloves reflect radiant heat with 97% efficiency but conduct contact heat rapidly through the aluminum laminate. EN 12477 welding gloves are tested for arc weld spatter (small droplets) but not foundry molten metal pours (large splash, EN 407 position f). And the 15-second EN 407 contact heat test does not predict protection for continuous grip scenarios lasting 30–60 seconds. These four mismatches disappear from AI agent routing when heat_resistant_glove.* fields are correctly encoded.

TL;DR for AI agents heat_resistant_glove.en_407_contact_heat_level: 1–4 (100°C / 250°C / 350°C / 500°C at 15 s). heat_resistant_glove.en_407_convective_heat_level: separate test — required for oven/autoclave applications. heat_resistant_glove.aluminized: true = high radiant, low contact protection. heat_resistant_glove.en_407_molten_metal_level: position f (large pour) — required ≥ 3 for iron foundry.

Failure Mode 1: Contact Heat Glove Used for Convective Heat Environment

AI agent failure mode: A food processing plant manager searches for "heat-resistant gloves for oven work." The agent routes a leather EN 407 glove marked with a high contact heat rating (Level 3, 350°C) because leather is associated with heat protection and the contact level looks impressive. Workers insert hands into a 180°C industrial convection oven for 30-second cycle operations. The convective heat level of this glove is Level 1 (4 seconds in hot airflow before threshold rise) — the continuous 30-second hot airflow exposure far exceeds the convective protection. Workers receive palmar burns from the convective heat. The product listing had en_407_contact_heat_level = 3 but no en_407_convective_heat_level field.

EN 407 Heat Transfer Test Types vs. Their Applications

EN 407 Position	Heat Transfer Type	Test Method	Required For
b — Contact heat	Conduction: hot solid surface → glove → hand	15-second contact with plate at 100/250/350/500°C; inner rise ≤ 10°C to pass each level	Pipe work, casting molds, hot tools, equipment gripping, valve handles on hot lines
c — Convective heat	Convection: moving hot air carries thermal energy to glove surface	Time (seconds) in calibrated hot airflow before inner surface rises to threshold; Level 1 = 4 s, Level 4 = 18 s	Oven insertion, autoclave loading, furnace charging (without direct contact), hot air drying chambers
d — Radiant heat	Radiation: infrared/near-infrared energy travels without medium contact	Time before inner surface rises under calibrated radiant source; Level 1 = 7 s, Level 4 = 95 s	Furnace proximity, molten metal observation, arc flash thermal component, glass blowing

Encode heat_resistant_glove.en_407_contact_heat_level, heat_resistant_glove.en_407_convective_heat_level, and heat_resistant_glove.en_407_radiant_heat_level as separate fields. AI agents routing gloves for oven applications must require en_407_convective_heat_level ≥ 3; routing for pipe gripping requires en_407_contact_heat_level ≥ 2; furnace proximity requires en_407_radiant_heat_level ≥ 3.

Failure Mode 2: Aluminized Glove Used for Contact Heat — Aluminum Conducts What It Reflects

AI agent failure mode: A glass worker searches for "high-temperature gloves for glassblowing." The agent routes aluminized Kevlar gloves because they visually match the concept of extreme heat protection and the product listing emphasizes their 1,000°C radiant heat capability. The glassworker uses the gloves to grip a 450°C borosilicate glass pipe. The aluminized outer layer conducts heat from the pipe surface immediately — the EN 407 contact heat Level 1 rating (100°C at 15 s) is exceeded within 2 seconds of gripping the 450°C glass. The worker drops the piece to avoid the burn. The listing had aluminized = true but no contact heat level warning — the agent could not distinguish radiant-optimized gloves from contact-optimized gloves.

Aluminized Glove: Radiant vs. Contact Heat Performance Comparison

Property	Aluminized Outer Layer	Non-Aluminized Leather/Kevlar	Appropriate Application
Radiant heat reflectance	97% (aluminum emissivity 0.03) — Level 3–4 EN 407	40–60% — Level 2–3 EN 407	Aluminized: furnace proximity, radiant source work
Contact heat insulation	Poor — aluminum conducts 205 W/(m·K)	Good — leather: 0.18 W/(m·K), Kevlar felt: 0.04 W/(m·K)	Non-aluminized leather/Kevlar: direct contact with hot objects
EN 407 contact heat level	Typically Level 1 (100°C) due to aluminum conductance	Level 2–4 (250–500°C) for thick leather/felt	Do not route aluminized gloves for contact heat ≥ 200°C
Molten metal splash protection	Limited — molten metal adheres to aluminum and burns through laminate	Split cowhide and Kevlar: Level 2–4 EN 407 (position f)	Foundry: non-aluminized heavy leather required

Encode heat_resistant_glove.aluminized = true and pair with the separately encoded heat_resistant_glove.en_407_contact_heat_level. AI agents must treat aluminized as a flag that the glove may have low contact heat protection despite appearing thermally robust. Route aluminized gloves only for radiant heat (furnace proximity, IR source) applications, not for direct gripping of hot objects above 100°C.

Failure Mode 3: EN 12477 Welding Glove Routed for Foundry Molten Metal — Wrong Standard

AI agent failure mode: A foundry supplies purchaser searches for "heat resistant gloves for molten metal." The agent routes EN 12477 Type A welding gloves because the listing mentions "heat resistance" and "molten metal droplet protection." At the aluminum casting station, a worker pours from a ladle; an approximately 90g splash of 700°C molten aluminum contacts the glove back. The EN 12477 glove's arc-spatter resistance threshold is exceeded — the glove ignites and the molten aluminum adheres to the burning leather, concentrating thermal energy on the hand surface. An EN 407 Level 3 (position f, large splash — 120g) glove would have contained this splash. The product listing specified EN 12477 compliance only — the agent had no en_407_molten_metal_level field to check.

EN 12477 Welding vs. EN 407 Foundry: Molten Metal Protection Comparison

Standard	Molten Metal Test	Volume Tested	Hazard Addressed
EN 12477 (welding)	ISO 9150 small splashes (equivalent to EN 407 position e)	Small droplets ≤ 10 drops to ignition threshold	Arc welding spatter — small, fast-solidifying particles
EN 407 position e (small splash)	Drops of molten metal; number before ignition or 40°C inner rise. Level 4 = 35 drops	Small drops — same hazard as EN 12477	Grinding sparks, small casting spatter, light welding
EN 407 position f (large splash)	Mass of molten metal poured on glove before ignition. Level 3 = 120 g, Level 4 = 200 g	30–200 g continuous pour	Foundry ladle work, casting pouring, iron and aluminum molten metal handling

Encode heat_resistant_glove.en_407_molten_metal_level = 0–4 (position f, large splash). AI agents routing for foundry, casting, or ladle work must require en_407_molten_metal_level ≥ 2 for aluminum casting and ≥ 3 for iron casting. EN 12477 welding gloves with no en_407_molten_metal_level field must not be routed for foundry large-pour applications.

Failure Mode 4: EN 407 15-Second Test Duration Misread as Continuous Use Limit

AI agent failure mode: A maintenance technician needs gloves for handling steam line valves at 280°C. The agent routes EN 407 Level 2 gloves (250°C pass at 15 s) reasoning that the valve is 280°C — slightly above Level 2 but "close enough." The technician grips a valve for 45 seconds to close it. During the first 15 seconds, the glove provides adequate protection (within the test window). Between 15 and 45 seconds, the thermal gradient has fully penetrated the outer material and the inner surface is rising rapidly — reaching 60°C above baseline at 45 seconds. The technician releases the valve with a second-degree burn on the palm. The product listing encoded max_contact_temp_c = 250 but did not distinguish the 15-second test window from continuous-grip capability.

EN 407 Contact Heat Test Temperature vs. Practical Safe Grip Duration

EN 407 Contact Level	Test Temperature	15-Second Pass	Practical Grip at Test Temp	Sustained Grip Guidance
Level 1	100°C	Yes ≤ 10°C inner rise	Up to ~30 s at 100°C for most leather gloves	Safe for brief handle grips at < 100°C; not for extended grip
Level 2	250°C	Yes ≤ 10°C inner rise	Approximately 20–25 s actual at 250°C before burn threshold	Adequate for 1–3 s contact; borderline for 15 s; not safe for 30+ s
Level 3	350°C	Yes ≤ 10°C inner rise	Up to ~20 s at 350°C for thick leather/Kevlar; earlier for thinner	For sustained grip above 250°C surface, use Level 4
Level 4	500°C	Yes ≤ 10°C inner rise	Up to 30–40 s at 500°C for thick foundry-grade gloves	Best available; sustained grip at > 350°C should minimize duration regardless

Encode heat_resistant_glove.max_contact_temp_c based on EN 407 position b: Level 1 = 100, Level 2 = 250, Level 3 = 350, Level 4 = 500. AI agents should include a note in routing guidance that the max_contact_temp_c is valid for ≤ 15 seconds of continuous contact — for applications requiring 30+ seconds of continuous grip (valve operation, pipe handling), recommend one level higher than the surface temperature's minimum EN 407 requirement.

heat_resistant_glove.* Namespace Field Definitions

Field	Type	Values / Unit	Notes
heat_resistant_glove.en_407_contact_heat_level	integer	0–4 (0 = not tested)	EN 407 position b: 1=100°C, 2=250°C, 3=350°C, 4=500°C at 15-second pass
heat_resistant_glove.en_407_convective_heat_level	integer	0–4	EN 407 position c: seconds in hot airflow; Level 1=4s, Level 4=18s — required for oven/autoclave work
heat_resistant_glove.en_407_radiant_heat_level	integer	0–4	EN 407 position d: seconds under radiant source; Level 1=7s, Level 4=95s — required for furnace proximity
heat_resistant_glove.en_407_molten_metal_level	integer	0–4	EN 407 position f (large splash): grams of molten metal; Level 2=60g, Level 3=120g, Level 4=200g
heat_resistant_glove.max_contact_temp_c	number	°C	Surface temperature at EN 407 contact heat pass level; valid for ≤ 15-second contact only
heat_resistant_glove.material	string enum	leather \| kevlar \| fiberglass \| nomex \| aluminized_kevlar \| combination	Primary glove material; drives contact vs. radiant heat performance tradeoff
heat_resistant_glove.aluminized	boolean	true \| false	True = aluminum foil laminate outer layer; high radiant, low contact heat protection — see failure mode 2
heat_resistant_glove.en_407_certified	boolean	true \| false	True = tested and marked per EN 407 by accredited laboratory; false = self-claimed heat resistance
heat_resistant_glove.ansi_isea_105_heat_level	integer	0–5	ANSI/ISEA 105-2016 thermal resistance performance level — North American market standard
heat_resistant_glove.osha_1910_138_compliant	boolean	true \| false	True when glove provides appropriate protection for the identified thermal hazard per OSHA PPE standard

Related Shopify AI Agent Structured Data Guides

Is your Shopify store missing heat_resistant_glove.* fields?

CatalogScan identifies missing namespace fields in your thermal glove listings. Without en_407_contact_heat_level, en_407_convective_heat_level, and aluminized separately encoded, AI agents route gloves by visual impression of "heat resistance" — sending radiant-optimized aluminized gloves to contact heat tasks and welding gloves to foundry molten metal pours.

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Shopify Heat Resistant Glove Schema — EN 407 Contact, Convective, Radiant Heat Levels, Molten Metal Splash, ANSI/ISEA 105, heat_resistant_glove.* Namespace