Engineered Hazardous Area & Marine Termination Solutions
Our flagship industrial cable entry systems undergo rigorous hydrostatic immersion tests, explosion containment validation, and salt-mist corrosion screening for global engineering resilience.
The Paradigm of Boundary Ingress & Explosion Containment
Explosion-proof cable glands (Ex cable glands) are not passive hardware fasteners; they function as primary mechanical barriers designed to prevent internal ignition propagation and halt environmental migration.
Flameproof (Ex d) Containment
Engineered to contain an internal explosion within an electrical enclosure, extinguishing hot escaping gases through precision-machined threaded and cylindrical flame paths (flame gaps) before they can ignite external explosive atmospheres (Group IIA, IIB, IIC).
- Flamepath length matched to enclosure volume
- Hydrostatic test pressure exceeding 30 bar
Increased Safety (Ex e) Integrity
Designed to prevent the formation of arcs, sparks, and excessive temperatures in normal or abnormal operation. Ex e terminations demand high-grade elastomeric compression seals and certified pull-out clamp resistance to protect non-sparking junction enclosures.
- IP66/IP68 dual sealing against moisture
- Thermal aging tested from -60°C to +130°C
Combustible Dust (Ex tb / Ex tc)
In environments with conductive or non-conductive combustible dusts (Group IIIC, IIIB), Ex cable glands eliminate the risk of dust smoldering or static ignition by establishing permanent IP6X mechanical hermetic closures over high continuous vibrations.
- Zero ingress under dynamic thermal vacuum
- Surface temperature control (T6/T5/T4)
What Global EPCs & Industrial OEMs Require
Procurement directors and chief electrical engineers at major international engineering, procurement, and construction (EPC) conglomerates prioritize zero-downtime, uncompromised traceability, and certified total cost of ownership (TCO).
Standardized Multi-Regional Certification
Multinational engineering deliveries cannot manage divergent supply chains for different markets. Sourcing from a premier Chinese Ex manufacturer that simultaneously validates under IECEx (international), ATEX (Europe), UL 2225 (North America), EAC (Customs Union), and JIS/GB3836 standards collapses multi-SKU overhead and streamlines site inspection approval.
Mitigation of "Cold Flow" Displacement
Unarmoured or armoured cables with thermoset/thermoplastic bedding often experience permanent deformation ("cold flow") when compressed by sub-standard rubber seals. Our advanced Ex glands feature patented elastomeric displacement diaphragms or resin barrier compounding sleeves that distribute compressive force uniformly, preventing core shorting and dielectric breakdown over decades.
High-Precision CNC Tolerances & Metallurgical Purity
Substandard raw brass or non-stabilized stainless alloys suffer from stress corrosion cracking (SCC) when exposed to H2S, sour gas, or coastal salt environments. HOONSUN utilizes strictly certified CuZn39Pb3 brass with electrolytic nickel plating (5–8 µm) and passivated 316L austenitic stainless steel, verified through 100% optical measurement systems.
Comprehensive Clamping Versatility (SWA, STA, Braided)
Procuring separate gland designs for Single Wire Armoured (SWA), Steel Tape Armoured (STA), Braided Marine, or Screened Flexible Conduit cables inflates stock costs. Our universal clamping cones and reversible armour locking rings allow single-SKU interchangeability without sacrificing mechanical pull-out strength.
Heavy-Duty Solutions Across High-Hazard Sectors
From ultra-deep offshore platforms and green hydrogen electrolysis plants to automated manufacturing cells, our explosion-proof cable entries maintain perimeter integrity under extreme thermal, physical, and chemical loads.
Offshore & Marine Platforms (FPSO / FLNG)
Operating in saline atmospheres containing chloride mist and continuous structural vibration. HOONSUN JIS-standard marine glands and EX4 series feature 316L stainless steel housings, high-tensile chloroprene/silicone seals, and deluge-proof sealing boots to prevent galvanic degradation and deep-water ingress.
Hydrogen Energy & Clean Fuel Technology
Hydrogen (Group IIC gas) possesses an extremely low minimum ignition energy (MIE = 0.017 mJ) and exceptional molecular diffusivity. Standard glands allow gas migration along cable strands. Our specialized barrier cable glands seal individual conductors using rapid-cure liquid resin compounds to eliminate interstitial leakage.
Petrochemical & Downstream Refining
Continuous exposure to benzene, hydrocarbon solvents, sulfur compounds, and high ambient thermal spikes. We utilize perfluoroelastomer (FFKM) or fluorosilicone sealing elements engineered for zero compression set, combined with nickel-plated brass bodies that resist sulfur-induced brittleness.
Mining, Tunnelling & Subsurface Extraction
High-impact risk, methane (Group I firedamp) accumulation, and heavy stone-dust deposits. Our Group I certified explosion-proof glands provide mechanical impact resistance exceeding 20 Joules, heavy armour clamping, and integral grounding locknuts for heavy rubber-sheathed dragline cables.
Advanced EV Battery & Liquid Cooling Modules
High-voltage automotive harnesses and ESS container battery racks require integrated 360° EMC shielding and fluid connection security. We supply paired metal-shielded joints and leak-tight liquid cooling connectors that isolate thermal loop fluids while shielding critical CAN-bus signals.
Robotics & Flexible Automation Gland Systems
Constant multi-axis rotational movement, mechanical flexure, and dynamic pulling forces require anti-bending spiral relief and flexible metal-hose integration. Our corrugated unions and spiral strain relief glands prevent core pinching while preserving IP68 immersion resistance.
Metallurgical & Elastomeric Selection Architecture
Correct gland selection mandates aligning metallurgical composition, thread geometry, and polymer compound performance with external environmental conditions and internal electrical loads.
| Gland Series / Type | Material Construction | Protection Classes | Seal Compounds | Thread Geometries | Primary Industrial Use Case |
|---|---|---|---|---|---|
| EX-Universal Armoured | Brass CW614N (Nickel-Plated), AISI 316L | Ex d IIC / Ex e IIC / Ex tb IIIC | Fluorosilicone / Chloroprene | Metric (M16–M100), NPT (1/2"–4") | Offshore Rigs, FPSO Modules, Oil Refineries |
| JIS Marine Standard | Marine Cast Brass, AISI 304/316 | IP68 (5 bar) / JIS F8801 | EPDM / NBR Sealing Ring | Metric, JIS Thread Pitch, PG | Commercial Shipbuilding, Dry Docks, Naval Fleets |
| EMC Shielded Metal | CuZn39Pb3 Brass + 360° Spring Contact | IP68 / EMC Shielded (Up to 100dB) | Viton (FKM) / Low Smoke PA66 | Metric (M12–M63), NPT, G (PF) | Variable Frequency Drives (VFD), EV Battery, Robotics |
| Barrier Resin Compound | AISI 316L Stainless Steel | Ex d IIC / Ex e / Zone 0 / Zone 1 | Epoxy Liquid Resin Matrix | Metric (M20–M75), NPT (1/2"–3") | Hydrogen Refuelling, High Gas-Migration Terminations |
| Reinforced Engineered PA66 | Virgin Polyamide 66 (UL 94 V-0 Rated) | IP68 (10 bar) / UL Listed | NBR Weatherproof Gasket | Metric, PG (PG7–PG63), NPT | Solar PV Combiner Boxes, Outdoor Telecom, HVAC |
| Metal Hose Conduit Gland | Nickel-Plated Brass, Stainless 304 | IP65 / IP67 Vibration-Proof | Polyoxymethylene (POM) Ferrule | Metric, PG, NPT, Gas Thread | CNC Machine Tools, Flexible Armor Conduit, Automation |
The Yueqing Hub: Two Decades of Machining Excellence
Situated in Liushi Town, Yueqing—China’s epicenter of high-end low-voltage and industrial electrical apparatus—Zhejiang Hongxiang Connector Co., Ltd. (HOONSUN) integrates complete R&D, precision toolmaking, automated CNC Swiss-lathe processing, and optical inspection under one roof.
In-House CNC Machining
We control dimensional tolerances within ±0.01mm on our proprietary 5-axis CNC machining centers. Cap nuts, outer bodies, clamping rings, and flame paths are turned directly from solid extruded bars, guaranteeing structural density without casting porosity or microscopic air voids.
100% Optical Thread Verification
Flameproof Ex d integrity relies entirely on thread engagement parameters (pitch, flank angle, root truncation). Every production lot undergoes computerized optical thread scanning alongside Go / No-Go thread plug gauges calibrated to ISO 965 and ANSI/ASME B1.20.1 standards.
Global Presence & Trade Audits
HOONSUN regularly showcases breakthrough hazardous area solutions to global procurement teams at major industry events, including the Canton Fair (Booth 20.1G03, Industrial Automation Zone) and Middle East Energy (Stand H8-B55), offering live factory audits and metallurgical verification reports.
Next-Gen Ex Glands: Intelligence & Thermal Diagnostics
The future of explosion protection is transitioning from purely mechanical containment to active, digital asset health monitoring. HOONSUN’s R&D roadmap directly addresses the challenges of Industry 4.0 and green transition infrastructure.
Embedded RFID & Digital Twin Maintenance Logs
To facilitate regulatory hazardous area inspection cycles under IEC 60079-17, our upcoming smart Ex line integrates ultra-rugged ATEX/IECEx certified passive RFID chips into the gland shoulder. Site inspectors scan the gland using handheld intrinsically safe tablets to view exact tightening torque, installation date, internal seal compound, and factory inspection records instantly.
Micro-Thermal Continuous Condition Monitoring
In high-load electrification arrays (such as multi-megawatt offshore wind turbine converter cabinets and solar battery storage containers), loose terminals create localized hotspots. We are engineering integrated fiber-optic and micro-thermistor sensor wells directly into the gland body, reporting temperature deviations to SCADA systems prior to combustion threshold breach.
Bio-Based & REACH/RoHS Eco-Compliant Polymers
Transitioning toward sustainable industrial supply chains, HOONSUN is actively qualifying bio-circular polyamides and fluorine-free elastomer matrices that match Viton/NBR sealing performance while eliminating polyfluoroalkyl substances (PFAS) in accordance with pending European Chemicals Agency (ECHA) updates.
Cryogenic Liquid Gas & Polar Arctic Engineering
Global energy routes expand into liquefied natural gas (LNG) transport and Arctic exploration. Our specialized low-temperature alloy formulations and fluorosilicone compound configurations are certified for continuous operation at -60°C without elastomer embrittlement or micro-cracking.
Specialty Industrial & Explosion-Proof Cable Joints
Explore our precision EMC-shielded joints, explosion-proof cable clamp fittings, and heavy-duty 316L stainless steel conduit unions manufactured to strict international engineering specifications.
Frequently Asked Engineering Questions
Detailed technical clarifications on hazardous area ingress standards, explosion-proof classifications, thread conversion, and certification compliance.
What is the practical distinction between Ex d (Flameproof) and Ex e (Increased Safety) cable glands?
Ex d (flameproof) cable glands are engineered to survive an internal deflagration within a heavy enclosure and quench escaping flame paths so that external gases cannot ignite. They require specific flamepath engagement lengths (minimum 5 or 8 full engaged threads depending on volume). In contrast, Ex e (increased safety) glands are used on enclosures that cannot produce arcs or sparks during regular operation; their purpose is to provide robust mechanical clamping and an IP66/IP68 boundary barrier that prevents sparking particles, dust, and moisture from ever entering the enclosure.
When must an engineering team specify Barrier Cable Glands instead of standard displacement elastomeric glands?
Under IEC 60079-14 and NEC 505, barrier cable glands (which utilize a two-part epoxy or silicone resin compound) are mandatory when: (1) the enclosure contains an internal source of ignition in Zone 1 / Class I Div 1; (2) the cable is not fully filled, has hygroscopic fillers, or exhibits significant interstitial airspace allowing gas to migrate along the core lengths; (3) the installation site experiences significant pressure piling; or (4) hydrogen (Group IIC gas) is present where traditional rubber seals cannot prevent micro-molecular leakage.
How does HOONSUN ensure IP68 integrity is maintained under dynamic temperature fluctuations?
A true IP68 rating requires agreed continuous submersion parameters (HOONSUN standard: 5 bar pressure / 50 meters water column for 168 hours). To prevent seal relaxation during thermal cycling from -60°C to +130°C, our glands use precision-formulated chloroprene, perfluoroelastomer (FFKM), or silicone seals with high elastic recovery and low compression set (<18% after 1000h). Each part features calibrated torque specifications published in our datasheets to prevent over-compression and cold-flow pinching.
What thread types and entry thread lengths are available for thick enclosure walls?
We machine all standard international threads: Metric (M12 to M100 according to ISO 965-1/3), NPT (1/2" to 4" per ANSI/ASME B1.20.1), PG (PG7 to PG63 according to DIN 40430), and BSPP/G (ISO 228). For cast enclosures or heavy junction boxes, we supply custom extended entry thread lengths (e.g., 20mm to 30mm) ensuring that the minimum requirement of 5 to 8 fully engaged threads is satisfied without thread adapters.
How do HOONSUN EMC-shielded cable glands maintain electromagnetic compatibility?
Our EMC-shielded cable joints incorporate an internal 360° phosphor bronze or stainless steel conical grounding spring ring that directly clamps the exposed braided shield of the cable when the cap nut is tightened. This architecture provides low-impedance grounding paths across frequencies from 10 kHz to over 1 GHz, attenuating electromagnetic interference (EMI) and radio frequency interference (RFI) up to 100 dB, preventing erratic signals in variable frequency drives (VFD) and automated robotics.
What documentation and test reports accompany custom OEM shipments?
Every delivery includes full batch traceability. We provide Material Test Certificates (EN 10204 3.1) stating the exact chemical metallurgy of the brass or stainless steel, third-party hydrostatic pressure inspection reports, RoHS and REACH compliance statements, and copies of CE, UL, and IP68 laboratory certifications. Custom laser-engraving with client part numbers, Ex markings, and serial numbers is directly handled in-house.
Engineer Your Explosion-Proof Perimeter With Confidence
Whether you are engineering a multi-billion dollar offshore FLNG platform, configuring high-current EV energy storage systems, or requiring custom private-label Ex cable entries, our Yueqing technical engineering team delivers verified safety, compliance, and direct-factory pricing.