Restructuring
Korea approved a restructuring plan in July 2026 involving Lotte Chemical's Yeosu operations and the Yeochun NCC integration.
Yeosu · explosion proof
Explosion-Proof Mobile Phone in Yeosu
Yeosu is a south coast city of about 269,000 people hosting a major refining and petrochemical complex. In November 2022 the company completed a 2.7 trillion won mixed feed cracker near the Yeosu No. 2 Complex, with annual capacity of 900,000 tonnes of ethylene and 500,000 tonnes of polyethylene. This page explains what to look for in an explosion proof mobile phone for Yeosu, and where the IS-04Z1 stands against that list today.
Pre-launch · certification in progress · Launching Q4 2026
Marking targetEx ib IIC T4Intrinsic safety, Zone 1 / 21 design target · certification in progress
AvailabilityQ4 2026via authorised distributors
Search topicexplosion proof
DeviceMobile Phone
RouteSpecification
WhereYeosu
Short answer. The SAMS IS-04Z1 is the intrinsically safe smartphone covered here for Yeosu: pre-launch, designed for Zone 1 and Zone 21 (marking target Ex ib IIC T4), with certification in progress and no certificate issued.
Where things stand: the IS-04Z1 has not launched, and none of its four certification routes has produced a certificate yet. An operator's own vendor approval is a separate step. Certification status. Place facts reviewed October 2026.
At a glance · explosion proof
Checklist: explosion proof mobile phone for Yeosu
| Check | What to look for | IS-04Z1 today |
|---|---|---|
| Protection concept | Flameproof (Ex d) or intrinsic safety (Ex i) | Intrinsic safety, level ib |
| Zone suitability | Zone 1 gas and Zone 21 dust | Design target for Zone 1 and 21 |
| Certificate | Number, issuing body and schedule of conditions | In progress; not issued |
| Where it applies | Yeosu: Refinery process units, Ethylene cracker and polymer plants, Chemical storage tank farms | Classified by the site operator |
Product · Yeosu
The product behind this search: the SAMS IS-04Z1.
SAMS IS-04Z1
An intrinsically safe Android smartphone designed for Zone 1 and Zone 21 hazardous areas in Yeosu. It is pre-launch: IECEx, ATEX and NEC 500 certification is in progress ahead of the Q4 2026 launch.
- IP68 sealed
- 4,000 mAh battery
- 50 MP camera
- Android 16
- Zone 1 / Zone 21 design target
The site · Yeosu
Yeosu at a glance: who is there, what is classified
A short profile of the site and the kinds of classified area that matter for portable equipment.
Operators and companies on site
- GS Caltex
- Lotte Chemical
Classified areas to expect
- Refinery process units
- Ethylene cracker and polymer plants
- Chemical storage tank farms
- Marine loading jetties
Local conditions · Yeosu
Conditions in Yeosu that affect handheld equipment
Climate
A humid subtropical climate with heavy June to August rain.
Field notes · Yeosu
More about Yeosu that matters for portable equipment
Yeosu: climate and equipment wear
Yeosu has a humid subtropical climate with very warm summers and cold winters, and from June to August more than 200 mm of rain falls each month.
Yeosu: who works there
GS Caltex is owned in equal shares by Chevron and GS Energy and was founded in 1967 as Korea's first private oil company, so it follows long-established corporate safety systems.
Yeosu: logistics and access
The company imports around 80 types of crude from about 30 countries and exported to 57 countries in 2022, so tanker and product shipping through the Yeosu coast is continuous.
Yeosu: infrastructure
The aromatics business started in 1990, with annual capacity of 3.0 million tonnes of aromatics and 180,000 tonnes of polypropylene, so benzene-type vapour hazards exist alongside fuel and olefin units.
The term · explosion proof
What “explosion proof” means for a smartphone
“Explosion proof” is the phrase most buyers use for equipment that may be taken into a classified hazardous area. Strictly, it covers several protection concepts: a flameproof enclosure (Ex d) contains an internal explosion, while intrinsic safety (Ex i) limits electrical energy so that an ignition cannot start. Phones are normally intrinsically safe, because a flameproof handset would be too heavy to carry all shift.
The IS-04Z1 uses intrinsic safety, with a marking target of Ex ib IIC T4, and is designed for Zone 1 and Zone 21. It is pre-launch, certification is in progress and no certificate has been issued.
In Yeosu. At a cracker and polymer complex, explosion-proof is loose shorthand. Flameproof Ex d protects fixed equipment, while a handheld phone around process units and tank farms depends on intrinsic safety. The IS-04Z1 is designed around that concept, with certification in progress and operator rules applying.
The route · specification
Specifying an explosion proof mobile phone for Yeosu
A short checklist for anyone writing or reviewing the specification, with the IS-04Z1 status against each point.
Check on the paper
- Marking
- Equipment group, category, protection concept, gas group and temperature class, matched to the area drawing.
- Certificate and schedule
- A certificate number, issuing body and the schedule of conditions, not a brochure claim.
- Standards edition
- The IEC 60079 or national standard edition the certificate was issued against.
Check for the IS-04Z1
- Marking target
- II 2 G Ex ib IIC T4: a target, not yet a certificate.
- Certificate status
- IECEx, ATEX, UKEX and NEC 500 in progress; none issued.
- Operator approval
- Separate from the certificate and handled with the site operator.
Questions · Yeosu
Frequently asked questions
Can we buy an explosion proof mobile phone in Yeosu today?
Not yet. The IS-04Z1 is pre-launch and its certification is still in progress ahead of a Q4 2026 launch. No unit goes into a classified area before the certificate covering it exists. The datasheet, the certification schedule and safe-area evaluation units are available now.
What does an explosion proof mobile phone in Yeosu cost?
SAMS has not published a price. Any figure you are offered for an uncertified Ex phone should be treated with caution; written indicative pricing is available for a defined quantity and site.
Is the IS-04Z1 explosion proof or intrinsically safe?
It is intrinsically safe (marking target Ex ib IIC T4), which is the usual way to make a phone for hazardous areas. It is not a flameproof (Ex d) design, and certification is still in progress.
Which areas at Yeosu would use it?
Likely candidates are refinery process units, ethylene cracker and polymer plants, chemical storage tank farms, marine loading jetties. Which areas are classified, and to what zone, is set by the site operator's own area classification drawings.
Is intrinsically safe the same as explosion proof?
Not exactly. Explosion proof is a broad everyday term; intrinsic safety is one protection concept, which limits energy so ignition cannot occur. Flameproof (Ex d) is a different concept that contains an explosion. The IS-04Z1 is intrinsically safe by design.
What are the main hazardous-area risks at the Yeosu complex?
Refining units, a heavy-oil upgrading facility, an olefins cracker, aromatics and polypropylene plants together create flammable vapour and gas areas, including ethylene and aromatic hydrocarbons. The operator sets zones and gas groups, so ask for classification drawings before bringing devices.
Is Yeosu convenient for equipment delivery?
The city has an industrial port coast and rail and road links to Gwangju and other Korean cities, so delivery is feasible, though customs and approvals take time for imported electronics. Confirm lead times with your forwarder and the site's gate rules.
Will the restructuring at Yeosu change who approves equipment?
It may. A restructuring plan involving Lotte Chemical's Yeosu operations was approved, and its status could change. Procurement and HSE contacts may be in transition. Confirm requirements with the site operator before sending any documents.
Related guides
Keep exploring
More on Yeosu, and on other places in South Korea.
Hazardous Area Mobile Phone in YeosuSame place, different guide
Ex-Proof Mobile Phone Distributor in YeosuSame place, different guide
Intrinsically Safe Mobile Phone Distributor in YeosuSame place, different guide
Industrial Mobile Phone Distributor in YeosuSame place, different guide
Rugged Mobile Phone in YeosuSame place, different guide
IECEx Mobile Phone in YeosuSame place, different guide
ATEX and IECEx Mobile Phone Distributor in BusanElsewhere in South Korea
ATEX and IECEx Mobile Phone Distributor in DaesanElsewhere in South Korea
ATEX and IECEx Mobile Phone Distributor in UlsanElsewhere in South Korea
ATEX and IECEx Mobile Phone Distributor in IncheonElsewhere in South Korea
South Korea market guideCertification route and regulators
All guides for South KoreaEvery route we cover
Certification statusWhat is in progress
Enquiry · Yeosu
Ask about the IS-04Z1 for Yeosu, South Korea
Send the site, zone and gas group and roughly how many handsets. We reply by email with the datasheet and the certification schedule.
Enquiry · Yeosu
Launching Q4 2026
Planning for Yeosu?
Send the zone and gas group of your site and we will reply with the datasheet and schedule.