2026-09-21 · Équipe éditoriale KeXinMaterials
Guide d'achat B2B caisses antidéflagrantes ATEX / IECEx 2026
L'achat B2B de caisses antidéflagrantes nécessite certification ATEX / IECEx, classification Zone 1/2/21/22, indice IP64+, matériau antistatique. Guide 2026.
Certification ATEX et IECEx
ATEX (Atmospheres Explosibles) is the EU directive 2014/34/EU. IECEx is the international IEC scheme. Both certify equipment for explosive atmospheres.
ATEX 2014/34/EU: EU directive. Mandatory for equipment sold in EU for use in explosive atmospheres. Covers Zone 0/1/2 (gas) and Zone 20/21/22 (dust).
IECEx: International scheme (IEC). Accepted in 30+ countries including Australia, Canada, China, Japan, Korea, Brazil. NOT automatically accepted in EU — need ATEX for EU sales.
UL HazLoc: North America (US/Canada). Class I Div 1/2 (gas), Class II Div 1/2 (dust), Class III. Different zone system than ATEX/IECEx.
China Ex (CNEx): China domestic certification. Required for sales in mainland China. Different marking but similar concept.
B2B recommendation: For EU sales → ATEX. For international → IECEx + ATEX (most flexible). For US/Canada → UL HazLoc.
Classification des zones (gaz + poussière)
Explosive atmospheres are classified into zones based on frequency and duration of explosive gas/dust presence.
Zone 0 (gas): Explosive atmosphere present continuously or for long periods. Highest protection required. Equipment category 1G.
Zone 1 (gas): Explosive atmosphere likely to occur in normal operation. Equipment category 2G. Most common industrial setting.
Zone 2 (gas): Explosive atmosphere not likely in normal operation, only briefly. Equipment category 3G. Lowest gas-zone protection.
Zone 20 (dust): Combustible dust cloud present continuously. Equipment category 1D.
Zone 21 (dust): Combustible dust likely in normal operation. Equipment category 2D.
Zone 22 (dust): Combustible dust not likely in normal operation. Equipment category 3D.
B2B application: Most oil & gas / chemical plants are Zone 1 (gas) or Zone 21 (dust). Cases for tools/instruments used in Zone 1/2 require ATEX II 2G or II 3G.
Indice IP + exigences antistatiques
Explosion-proof cases need IP64+ rating (dust-tight + splash-proof) and anti-static / conductive material to prevent spark ignition.
IP rating: IP64 minimum (dust-tight + splash-proof). IP65/IP66/IP67 preferred for outdoor / wash-down environments.
Surface resistivity: < 1×10^9 ohm for conductive / static-dissipative material. Measured per IEC 60079-0.
Material options: Conductive PP (carbon black filled), aluminum (natural conductor), stainless steel (natural conductor). Avoid standard PP / ABS (insulating, can build static).
Hardware: ATEX-rated latches / hinges / handles. Standard plastic hardware can build static and spark. ATEX-rated metal hardware required.
Anti-static coating: Optional surface treatment. Reduces surface resistivity to < 1×10^9 ohm. Apply on standard PP if cost is priority.
Cable glands: ATEX-rated cable glands (Ex e or Ex d) for any cable entry. Standard cable glands not allowed in Zone 1.
B2B recommendation: Conductive PP for cost-sensitive Zone 2/22. Aluminum for Zone 1/21 (better durability + heat dissipation).
Conception de caisse antidéflagrante
Case design for explosive atmospheres requires specific engineering: gap control, flame path, pressure relief, and material selection.
Gap control: Joint gaps must be < 0.1mm for Zone 1 to prevent flame passage. Machined surfaces with tight tolerances.
Flame path: For Ex d (flameproof), the flame path length typically 10-25mm. Internal explosion contained without igniting external atmosphere.
Pressure relief: Cases for Zone 1 may need pressure relief valve to vent internal pressure buildup without igniting external gas.
Wall thickness: Typically 3-5mm for injection molded cases. Aluminum cases 1.5-3mm.
Material certification: ATEX material certificate required for plastic enclosures. Aluminum / stainless steel typically exempt if alloy certified.
B2B recommendation: Specify Zone 1 + II 2G + IP65 + conductive PP for general oil & gas. Specify Zone 0 only if measuring instruments are inside.
Mousse personnalisée + intérieur pour zones Ex
Foam interior for explosion-proof cases must also be conductive / anti-static. Standard PU / EVA foam can build static.
Conductive PU foam: Carbon-filled polyurethane. Surface resistivity < 1×10^9 ohm. Compatible with Ex zone 1/2.
Conductive EVA foam: Carbon-filled EVA. Same conductivity as conductive PU. More rigid, better for precision fit.
Standard PU / EVA foam: NOT suitable for Ex zones. Insulating material can build static and spark.
Foam density: 30-45 kg/m³ for general protection. Higher density (50-80 kg/m³) for shock / vibration sensitive equipment.
Pick-and-pluck vs CNC: Pick-and-pluck for prototyping (Zone 2 acceptable). CNC routed foam for Zone 1/21 production.
B2B cost: Conductive foam 2-3× cost of standard foam. Add USD 5-20 per case over standard foam. Lead time +1-2 weeks.
Personnalisation OEM/ODM pour caisses ATEX
ATEX case customization requires strict control of materials, hardware, and certification scope. OEM development typically takes 60-180 days.
Material substitution: Cannot change plastic resin without re-certification. Adding carbon black to PP = full re-test.
Hardware change: Adding new latch / hinge / handle = re-certification. OEM ATEX hardware list is closed.
Foam change: Conductive foam does not require substitute. But adding new foam supplier may need re-test.
Dimension change: Wall thickness change > 0.5mm or dimension change > 5% = re-certification. Significant cost.
Color change: Pigment / color masterbatch must be conductive or anti-static. Standard color pigments not allowed.
OEM mold: New mold = full ATEX certification from start. Cost USD 30,000-100,000 for ATEX-certified mold. Lead time 90-180 days.
B2B recommendation: Buy off-the-shelf ATEX case (pre-certified) and customize within existing parameters. Avoid full OEM unless volume > 5,000 cases/year.
Résumé coûts B2B + délai
ATEX / IECEx explosion-proof cases cost 2-5× standard protective cases due to certification + materials.
Stock ATEX case (small, 300x250x150mm): USD 200-400 per case. MOQ 10 cases. Lead time 2-4 weeks.
Stock ATEX case (mid, 500x400x250mm): USD 400-800 per case. MOQ 5 cases. Lead time 2-4 weeks.
Stock ATEX case (large, 800x600x400mm): USD 800-2,000 per case. MOQ 1 case. Lead time 2-6 weeks.
OEM ATEX case: USD 5,000-30,000 mold + USD 50-200 per case. MOQ 1,000+ cases. Lead time 90-180 days.
Conductive foam upgrade: USD 5-20 per case over standard foam. Lead time +1-2 weeks.
Hardware upgrade (ATEX-rated): USD 10-30 per case over standard hardware. Lead time +2-4 weeks.
Certification cost: ATEX certification USD 5,000-30,000 per product. IECEx USD 10,000-50,000. UL HazLoc USD 15,000-50,000. Re-test USD 3,000-15,000 per change.
Exemples d'applications B2B
Explosion-proof cases are used in oil & gas, chemical, mining, pharmaceutical, and grain handling industries.
Oil & gas upstream: Drilling tools, wellhead instruments, fracking equipment. Zone 1 typical. Aluminum cases preferred.
Oil & gas downstream: Refinery inspection tools, control instruments. Zone 2 typical. Conductive PP cases acceptable.
Chemical plants: Solvent measurement, flammable liquid sampling. Zone 1/2. Stainless steel or aluminum preferred.
Mining: Methane environments (underground coal mining). Zone 1. Special MSHA-certified cases required (different from ATEX).
Pharmaceutical: Solvent / powder handling. Zone 2/22. Conductive PP or aluminum. FDA-grade materials for direct contact.
Grain handling / agriculture: Combustible dust (grain dust, flour). Zone 21/22. Conductive PP for cost-effectiveness.
B2B recommendation: Match case certification (ATEX vs IECEx vs UL) to end-user jurisdiction. Match Zone rating (1 vs 2 vs 21 vs 22) to actual deployment environment.
Points clés
- ATEX : directive UE ; IECEx : international (30+ pays) ; UL HazLoc : US/Canada
- Applications B2B courantes : Zone 1 + Zone 21 ; cert caisse : II 2G / II 2D minimum
- IP64+ + résistivité surface < 1×10^9 ohm ; PP conducteur / aluminium
- Mousse conductrice : USD 5-20 surcoût ; moule OEM ATEX : USD 30.000-100.000 + 90-180 jours
- Certification ATEX : USD 5.000-30.000 / produit ; re-test pour modifications
- Coût B2B : USD 200-2.000 / caisse ATEX stock ; OEM USD 50-200 + moule
FAQ
Qu'est-ce que la certification ATEX pour caisses de protection ?
ATEX (Atmospheres Explosibles) est la directive UE 2014/34/EU pour équipements en atmosphères explosibles. Pour caisses : Zones 0/1/2 (gaz) et 20/21/22 (poussière). Catégories 1G/2G/3G et 1D/2D/3D.
Quelle est la différence entre ATEX et IECEx ?
ATEX : directive UE obligatoire. IECEx : système international IEC, accepté dans 30+ pays. Système de zones similaire. Pour ventes internationales, obtenir les deux.
Quelle est la différence entre Zone 1 et Zone 2 ?
Zone 1 : atmosphère explosible probable en fonctionnement normal. Zone 2 : non probable, seulement brièvement. Les caisses Zone 1 coûtent plus cher.
Quelle est l'exigence de résistivité de surface pour caisses ATEX ?
La résistivité de surface doit être < 1×10^9 ohm selon IEC 60079-0. Atteint via PP conducteur, aluminium ou acier inoxydable. PP/ABS standard non autorisés en Zone 1.
Peut-on personnaliser une caisse ATEX ?
Personnalisation limitée : logo OK. Couleur doit rester conductrice. Mousse doit être conductrice. Changement matériel nécessite re-test (USD 3.000-15.000).
Quelle est la différence de coût entre caisses ATEX et standard ?
Les caisses ATEX coûtent 2-5× plus. Exemple : caisse moyenne standard USD 50-150. ATEX USD 400-800. Coûts : matériau ATEX +30-50%, matériel ATEX +50-100%, certification.
Quel indice IP est requis pour caisses ATEX ?
Minimum IP64. IP65 recommandé pour extérieur/lavage. IP66 pour marin/lourd. IP67 pour exposition eau occasionnelle. Zones ATEX nécessitent typiquement IP65+.
Combien de temps prend la certification ATEX ?
ATEX prend 8-16 semaines pour nouveau produit. Inclut revue conception, tests matériaux, prototype, audit organisme notifié, documentation. Re-test 4-8 semaines.