Zone 1 gas across cracker and reactor units
Olefins crackers, aromatics units and polymer reactors at Japan's petrochemical complexes are classified Zone 1 gas atmospheres, and Ex ib IIC T4 covers the hydrocarbon gas groups typical of that service.
Japan · Petrochemical
Explosion proof mobile phone for petrochemical sites in Japan
Japan's petrochemical industry is concentrated in coastal complexes, and an explosion proof mobile phone for petrochemical sites in Japan has to work across several companies' plants. The main complexes include Kashima, Mizushima, Chiba and Sodegaura on Tokyo Bay, Yokkaichi and Sakai. This page is for the HSE, instrumentation and telecoms people who set the rules for portable devices around crackers and polymer plants. The IS-04Z1 is designed around intrinsic safety rather than a flameproof enclosure.
Launching Q4 2026 · IECEx and JIS programme in progress
Local approvalTIIS · IECExIECEx · TIIS in progress
AvailabilityQ4 2026via authorised distributors
Why it fits petrochemical
Built for shared industrial complexes with decades of history
Japan's petrochemical complexes are older than most equivalent sites in the Middle East or China, and their shared-complex layout means contractors and equipment often move between neighbouring companies' plants.
Some of the longest-operating petrochemical infrastructure in Asia
Complexes like Yokkaichi and Mizushima have been in operation since the 1950s and 60s, meaning classified-area documentation can span many decades of incremental expansion, a mixed-vintage layout a broadly rated device is built to sit alongside.
Multi-company shared industrial complexes
Each major complex hosts multiple separately operated companies' plants on adjacent sites, meaning a device standard recognised across the complex, rather than by only one company, reduces friction for contractors and inspectors moving between plants.
JIS-referenced marking alongside IECEx
As with the rest of Japan's hazardous-area equipment market, Japan's JIS-referenced explosion-protection system sits alongside IECEx as an expected reference point.
Fleet management across a shared industrial complex
EMM and MDM enrolment supports an operator managing devices consistently across its own plants within a shared multi-company complex.
Who runs it
Petrochemical operators in Japan
Japan's petrochemical production is organised around several large coastal industrial complexes hosting multiple operators.
- Mitsubishi Chemical
- Major petrochemical producer with complexes including Kashima.
- ENEOS
- Integrated refining and petrochemical operations at several coastal complexes.
- Idemitsu Kosan
- Petrochemical production alongside its refining business.
- Certification target
- IECEx Certificate of Conformity as the international basis, alongside JIS-referenced marking.
The sites
Explosion proof mobile phone use across Japan's petrochemical complexes
Each complex combines crackers, aromatics units, polymer plants and shared utilities. Yokkaichi and Mizushima date back to the middle of the twentieth century, so classified-area drawings often reflect many rounds of expansion. Gas hazards are light olefins, aromatics and hydrogen, while polyethylene and polypropylene powder create dust atmospheres at silos and bagging lines. Zone 1 gas and Zone 21 dust can occur within the same plant, which is why a single handset suited to both is useful. Operators include Mitsubishi Chemical, ENEOS and Idemitsu Kosan, and other companies have plants in the same complexes.
Complexes
- Kashima, Ibaraki
- Petrochemical complex beside a refinery.
- Mizushima, Okayama
- Refining and petrochemical complex on the Seto Inland Sea.
- Chiba and Sodegaura
- Tokyo Bay complexes.
- Yokkaichi, Mie
- One of Japan's oldest petrochemical complexes.
- Sakai, Osaka
- Refining and petrochemical operations.
Typical classified areas
- Cracker furnaces and columns
- Light hydrocarbon gas in open plant.
- Aromatics units
- Benzene and related vapours.
- Polymer reactors
- Gas and solvent under pressure.
- Powder silos and bagging
- Combustible dust.
- Pipe racks and tank storage
- Vapour at joints, vents and loading points.
Use cases
How work is organised across shared complexes
Contractors01
Moving between plants
Inspectors and maintenance crews work at several neighbouring plants, each with its own gate and permit system. A device with a clear marking and a tidy document set is easier to explain each time.
Shutdown02
Cracker turnaround
A cracker stops for inspection on a planned cycle, bringing many people into classified areas at once. Handsets managed centrally can be issued, locked down and collected without a workshop visit.
Dust03
Powder handling checks
Silo and bagging inspections involve dust areas, where a Zone 21 design target matters. Whether a handset is accepted there depends on the certificate and the site's own rules.
Questions · Petrochemical
Frequently asked questions
Is the IS-04Z1 certified for petrochemical use in Japan yet?
No. The device is pre-launch and certification, including IECEx and JIS-referenced marking, is still in progress ahead of the Q4 2026 launch.
Does the device suit older, decades-old petrochemical infrastructure?
It is designed to be usable across mixed-vintage classified areas without requiring separate devices for older and newer sections, though site-specific classification always takes precedence.
Does approval at one company's plant carry to a neighbouring plant in the same complex?
No, each company operating within a shared industrial complex runs its own procurement and engineering-approval process, even where sites are adjacent.
Is JIS marking required in addition to IECEx?
Japanese operators generally expect JIS-referenced marking as the recognised domestic system, with IECEx serving as supporting international evidence.
Which companies work in these complexes?
Mitsubishi Chemical, ENEOS and Idemitsu Kosan are among them, together with other chemical companies that share the same complexes.
Does a handset approved at one plant carry to a neighbour?
No. Each company runs its own procurement and review, even where plants are adjacent.
Is dust a real concern in petrochemicals?
Yes, wherever polymer powder is stored, conveyed or bagged. The IS-04Z1 design target includes Zone 21, subject to the certificate once issued.
Could one standard cover a whole complex?
Only if the operators agree on it. Ask each operator and the complex's shared-services body, where one exists, what it expects of portable devices.
Enquiry · Petrochemical
Ask about the IS-04Z1 for Petrochemical, Japan
Tell us the site, the zone and gas group, and roughly how many handsets. The SAMS team replies by email with the datasheet and the certification schedule for Japan. The IS-04Z1 is pre-launch and certification is in progress, so there is no list price yet; indicative pricing is issued in writing against a stated quantity and site.
Enquiry · Petrochemical
Launching Q4 2026
Evaluating the IS-04Z1 for this site?
Tell us the zone, gas group and operator. We will send the datasheet and the certification schedule for your market.