2026-09-21 · KeXinMaterials Editorial Team
Oil & Gas Explosion-Proof Case: ATEX/IECEx Zone 1 Zone 2 B2B Guide 2026
Oil & gas industry demands explosion-proof cases for Zone 1/2 hazardous areas. ATEX (EU) + IECEx (international) + UL Class I/II (US) certifications required. Cases must use conductive foam + non-sparking hardware. Here is the 2026 B2B procurement guide.
Hazardous Area Classification (ATEX/IECEx)
ATEX Zone 1 / Zone 2 / Zone 21 / Zone 22 + IECEx equivalent classifications define where explosion-proof equipment is required. Misclassification is a safety + legal risk.
Zone 1 (gas): area where explosive gas atmosphere is likely to occur in normal operation. Continuous presence = high risk. Required: Ex d (flameproof) or Ex e (increased safety) enclosures.
Zone 2 (gas): area where explosive gas atmosphere is not likely to occur in normal operation, and if it does, only for short periods. Lower risk. Required: Ex n or equivalent.
Zone 21 (dust): area where combustible dust cloud is likely to occur in normal operation. Required: Ex tD (dust) enclosures.
Zone 22 (dust): area where combustible dust cloud is not likely to occur in normal operation. Lower risk.
Common in oil & gas: Zone 1 (refinery, drilling rig interior), Zone 2 (refinery exterior, tank farm), Zone 21 (grain processing, chemical), Zone 22 (similar).
Ex Protection Types
Ex d (flameproof), Ex e (increased safety), Ex i (intrinsic safety), Ex tD (dust) are the main protection types. Choice depends on equipment + zone.
Ex d (flameproof): enclosure contains any internal explosion without propagating to outside atmosphere. Heavy, expensive. Standard for Zone 1 high-power equipment.
Ex e (increased safety): no sparks or hot surfaces in normal operation. Lighter than Ex d. Standard for Zone 1 low-power equipment (junction boxes, instrument cases).
Ex i (intrinsic safety): circuit power limited so no ignition possible. Standard for Zone 0/1 measurement + control equipment (sensors, instruments).
Ex tD (dust protection): enclosure prevents dust ingress to ignition source. Standard for Zone 21/22.
Ex nA (non-sparking): no arcs or sparks in normal operation. Standard for Zone 2 light equipment.
ATEX Certification Requirements
ATEX 2014/34/EU is mandatory for equipment used in EU hazardous areas. IECEx is international. UL Class I/II/Div 1/2 is US equivalent.
ATEX 2014/34/EU: EU mandatory. Equipment Groups I (mining) + II (non-mining). Categories 1, 2, 3 corresponding to Zones 0/1/2 or 20/21/22. Notified Body certification required (e.g., TUV, SGS, Bureau Veritas).
IECEx: international (IEC system). IEC scheme accepted in Australia, NZ, Japan, Korea, Canada, US (alongside UL). Single IECEx certificate accepted in multiple jurisdictions.
UL Class I/II/Div 1/2: US equivalent. Class I = gas, Class II = dust. Div 1 = Zone 1/21, Div 2 = Zone 2/22. UL Listed vs UL Recognized distinction.
For B2B procurement in oil & gas: ATEX + IECEx + UL Class I/II triple certification is ideal for global operations.
Cost: ATEX certification USD 10,000-30,000 per case model. IECEx USD 8,000-25,000. UL Class I/II USD 15,000-40,000. Combined USD 25,000-80,000.
Conductive Foam + Anti-Static Requirements
Foam interior + connecting equipment + non-sparking hardware are critical for Zone 1/2 cases. Standard PU foam cannot be used.
Conductive foam: surface resistivity 10^3-10^5 Ω. Dissipates static charge to ground. Standard for Zone 1/2 cases. PU foam with carbon black or metal fiber additive.
Anti-static foam (AS): surface resistivity 10^9-10^11 Ω. Prevents static buildup. Acceptable for Zone 2 cases. PU foam + chemical anti-static additive.
Standard foam (no treatment): surface resistivity >10^12 Ω. NOT acceptable for Zone 1/2. May cause static discharge and ignition.
Non-sparking hardware: brass, aluminum, or stainless steel. Avoid steel (sparks on impact). Standard for Zone 1 cases.
Material compliance: ATEX/IECEx cases typically use brass or aluminum hinges / latches / handles. Stainless steel for marine / offshore use.
B2B Use Cases in Oil & Gas
Different oil & gas applications require different Ex protection levels. Below is the typical 2026 B2B procurement recommendation by use case.
Offshore drilling rig (Zone 1 + marine): Ex d flameproof enclosure + IP66/IP67 + MIL-STD-810G + salt fog + conductive foam. Required: ATEX + IECEx + DNV-GL offshore certification.
Refinery interior (Zone 1): Ex d or Ex e enclosure + IP65 + MIL-STD-810G + conductive foam. Required: ATEX + IECEx.
Refinery exterior + tank farm (Zone 2): Ex nA or Ex e enclosure + IP65 + anti-static foam. Required: ATEX + IECEx.
Petrochemical plant (Zone 21/22 dust): Ex tD dust protection + IP65 + anti-static foam. Required: ATEX + IECEx.
Pipeline inspection / portable equipment: Ex i intrinsic safety + IP65 + lightweight. Required: ATEX + IECEx.
Oil field service vehicle: rugged hard case with Ex e or Ex nA + MIL-STD-810G + conductive foam. Required: ATEX for EU + IECEx for global.
IP Rating + Drop + Temperature
Oil & gas cases need robust IP rating + drop + temperature performance beyond normal industrial cases.
IP rating: IP65 minimum for Zone 1/2 (dust-tight + water jet). IP66 (powerful water jet) for offshore / marine. IP67 (immersion) for tropical / heavy rain deployment.
Drop test: MIL-STD-810G method 516.6 (26 drops) required for offshore. 8+ feet drop height typical.
Temperature: -40C to +70C typical for outdoor / arctic / desert deployment. ATEX/IECEx certified to IEC 60068-2-1 (cold) + IEC 60068-2-2 (dry heat).
Salt fog: ASTM B117 / MIL-STD-810G method 509.5 (salt fog) for offshore / marine. 48-96 hours exposure minimum.
Chemical resistance: resistant to hydrocarbons (oil, gasoline, diesel), acids (H2S, H2SO4), and bases. Standard for refinery / petrochemical use.
Cost + Lead Time + MOQ
Explosion-proof cases have higher cost + longer lead time than standard hard cases due to certification + specialty materials.
Stock SKU (Ex e / Zone 2): USD 300-600. ATEX self-certification. Lead time 7-15 days.
Custom OEM (Ex d / Zone 1): USD 500-1500. ATEX + IECEx third-party certification. Lead time 60-90 days (incl certification).
Custom OEM (Ex d + offshore / DNV-GL): USD 1000-3000. ATEX + IECEx + DNV-GL + salt fog + MIL-STD-810G. Lead time 90-120 days.
MOQ: stock 10-50 cases. Custom OEM 50-200 cases. Lower MOQ for Zone 2 cases than Zone 1.
Annual certification maintenance: USD 5,000-15,000/year for audit + surveillance. Audit by Notified Body required for ongoing ATEX certification.
KeXinMaterials Explosion-Proof Capability
KeXinMaterials offers ATEX + IECEx + UL Class I/II certified explosion-proof cases. EXW Shenzhen / FOB Shenzhen / FOB Ningbo only.
Stock SKUs: Ex e Zone 2 + IP65 + conductive foam. ATEX self-certification. USD 300-600.
Custom OEM: Ex d Zone 1 + IP66/IP67 + conductive foam + MIL-STD-810G + salt fog. ATEX + IECEx third-party certified. USD 500-1500.
Offshore package: Ex d Zone 1 + IP66 + DNV-GL + MIL-STD-810G + salt fog + conductive foam. ATEX + IECEx + DNV-GL + UL. USD 1000-3000.
Certifications: ISO 9001:2015 + ISO 14001:2015 + ATEX 2014/34/EU + IECEx + UL Class I/II. Notified Body: TUV Rheinland.
Test partners: TUV Rheinland (ATEX), SGS (IECEx), UL LLC (UL), Bureau Veritas (DNV-GL). All certified test reports valid globally.
Key Takeaways
- ATEX Zone 1/2 + IECEx + UL Class I/II triple certification for global oil & gas
- Ex d (flameproof) for Zone 1 high-power; Ex i (intrinsic safety) for Zone 0/1 measurement
- Conductive foam 10^3-10^5 Ω mandatory for Zone 1/2; anti-static for Zone 2
- Non-sparking hardware: brass/aluminum/stainless steel; never standard steel
- Cost: USD 300-3000/case; lead time 7-120 days; MOQ 10-200 cases
FAQ
What is the difference between ATEX Zone 1 and Zone 2?
Zone 1 (gas): explosive gas atmosphere likely in normal operation. High risk. Requires Ex d / Ex e / Ex i certified equipment. Zone 2 (gas): explosive gas atmosphere not likely in normal operation. Lower risk. Requires Ex n or equivalent. Misclassification is a safety + legal risk. Standard for Zone 1: Ex d flameproof enclosure + conductive foam. Standard for Zone 2: Ex nA non-sparking enclosure.
Is IECEx accepted globally?
Yes. IECEx is the international certification scheme accepted in 30+ countries including Australia, NZ, Japan, Korea, Canada, US, EU, Brazil, India, China. Single IECEx certificate simplifies global operations. ATEX is mandatory in EU; IECEx is the global alternative. For global oil & gas operations, dual ATEX + IECEx certification is ideal.
What foam is required for Zone 1 explosion-proof cases?
Conductive foam with surface resistivity 10^3-10^5 Ω. PU foam + carbon black or metal fiber additive. Standard foam (>10^12 Ω) NOT acceptable. Conductive foam dissipates static charge to ground, preventing ignition of explosive atmosphere. Anti-static foam (10^9-10^11 Ω) acceptable for Zone 2 but not Zone 1.
What is the cost of ATEX certification for a hard case?
ATEX certification cost: USD 10,000-30,000 per case model. Self-certification (manufacturer declaration) for Zone 2 categories is cheaper (USD 3,000-8,000). Third-party Notified Body certification for Zone 1 categories is more expensive (USD 10,000-30,000). Combined ATEX + IECEx + UL Class I/II: USD 25,000-80,000 per case model.
Are explosion-proof cases different from IP67 cases?
Yes. IP67 is water ingress protection (immersion 1m 30min). Explosion-proof (Ex d/Ex e/Ex i) is ignition prevention in explosive atmospheres. They are complementary, not substitutes. A Zone 1 explosion-proof case typically also has IP65/IP66/IP67 rating, but a standard IP67 case without Ex certification cannot be used in Zone 1. Cost difference: IP67 case USD 50-200; Ex + IP67 case USD 300-3000.
Can a standard hard case be used in Zone 2 with modifications?
Standard hard cases cannot be used in Zone 2 even with modifications. Zone 2 mandates Ex nA or Ex e certification by manufacturer declaration or third-party. Modifications to standard cases (anti-static foam, non-sparking hardware) are insufficient without Ex certification. B2B buyers must source Zone 2-rated cases with proper documentation.