Zone 1 gas and Zone 21 dust in one route
A walk from a reactor bay to a silo hall crosses both. One device designed for Zone 1 and Zone 21 means the operator carries one unit, not a gas phone and a dust phone.
Thailand · SCG Chemicals
Explosion proof mobile phone for SCG Chemicals in Thailand
SCG Chemicals runs naphtha crackers and polyolefin plants at Map Ta Phut in Rayong, which makes it one of the places in Thailand where an explosion proof mobile phone has to cover gas and polymer dust in a single building. This page is for SCGC operations, maintenance and HSE teams and the contractors on their shutdowns. The SAMS IS-04Z1 is designed for Zone 1 and Zone 21; it is pre-launch and certification is in progress. The IS-04Z1 is designed around intrinsic safety rather than a flameproof enclosure.
Launching Q4 2026 · certification programme in progress
Local approvalIECEx · TISIECEx · TISI and NBTC route in progress
AvailabilityQ4 2026via authorised distributors
SCG Chemicals · the site
The SCGC crackers and polymer plants at Map Ta Phut
Trade press describes SCG as owning two crackers at Map Ta Phut: the Rayong Olefins Company (ROC) cracker, reported at about 800,000 tonnes a year of ethylene and 400,000 of propylene, and the Map Ta Phut Olefins Company (MOC) cracker, reported at about 1 million tonnes of ethylene and 500,000 of propylene. Their output feeds polyethylene, polypropylene and PVC plants, including Siam Polyethylene, Thai Polyethylene, Thai Polypropylene, Thai Plastics and Chemicals and HMC Polymers, with ROC's own HDPE and PP lines reported at 920,000 and 720,000 tonnes a year. These are press figures, not SCGC statements. The point for a handset is the route: furnace and quench gas at one end, reactor loops and extruders in the middle, and powder silos and bagging at the other, all inside the IEAT estate.
Operators and sites
- ROC cracker complex
- Ethylene, propylene and an associated aromatics unit, with polyolefin plants downstream.
- MOC cracker
- Naphtha cracker producing ethylene and propylene, with by-product C4 and gasoline.
- Polyethylene plants
- Reactor, extrusion and powder handling for HDPE and related grades.
- Polypropylene plants
- Propylene polymerisation with pellet and powder silos.
- PVC and related units
- Chlorine-based chain operated through Thai Plastics and Chemicals.
- Contractors
- Cracker and polymer shutdown firms who join under SCGC site rules and the IEAT pass.
Classified units and areas
- Furnace and quench
- Fuel gas, hot surfaces and cracked gas; temperature class matters.
- Compression and cold box
- Ethylene, propylene and hydrogen, group IIC.
- Reactor loops
- Hydrocarbon diluent and catalyst handling under pressure.
- Extrusion and pelletising
- Hot polymer and volatile release at the die and degassing bins.
- Powder silos and bagging
- Combustible polymer dust, the classic Zone 21 situation.
Built for local conditions
What a polyolefin site does to a handset
A cracker alone is hard on equipment; a polymer plant adds dust. Both are on this page.
IP ratingIP68
Battery4,000 mAh
Camera50 MP
OSAndroid 16
Group IIC across the cracker
Ethylene and hydrogen run through the cold section, so the marking target is II 2 G Ex ib IIC T4. A device with a lower gas group would be refused entry to part of the plant.
Fine powder on seals and ports
Polymer powder works into connectors and charging ports. IP68 sealing and rugged build answer dust and washdown, but the Ex marking is what decides entry.
Humid heat and monsoon rain
Rayong is humid all year with the southwest monsoon from May. Open pipe racks and furnace structures give no shelter during rain.
SCG Chemicals · working and approvals
How work is organised at SCGC, and what its teams would ask for
A cracker runs for years between turnarounds, and the contractor population spikes during them.
Turnarounds and polymer line stops
Planned stops for the crackers and individual polymer lines bring contractor crews into classified areas on a pass with a fixed window. The unit must be enrolled before the gate and cleared at the end of the job.
Operator rounds and contractors together
Permanent operators and temporary crews are in the same area, so the console profile should differ between them: permit app and camera for one, a narrower set for the other.
Vendor and equipment approval
We have not verified an SCGC approval programme for portable devices, so we do not describe one. Ask SCGC procurement and HSE for the approval steps and documents expected alongside the Ex certificate.
National file
TISI, the Department of Industrial Works, IEAT and NBTC each apply on top of the IECEx evidence. All are in progress, and SCGC would still review the device itself.
SCG Chemicals · use cases
Where the IS-04Z1 explosion proof mobile phone goes to work.
Olefins01
Cracker furnace and compression rounds
An operator logs readings on the furnace deck, photographs a hot spot and attaches the position, all without leaving the Zone 1 boundary.
Polymers02
Silo and bagging inspections
An inspector checks dust extraction and bag filters, photographs housekeeping and records the finding in a Zone 21 area on the same handset used on the reactor floor.
Maintenance03
Line stop job packs
A planner pushes the job pack and permit to a contractor handset and removes it when the job is signed off.
Questions · SCG Chemicals
Frequently asked questions
Can SCGC buy an explosion proof mobile phone from SAMS today?
No. The IS-04Z1 is pre-launch with a Q4 2026 launch, and IECEx, ATEX and NEC 500 certification are in progress. The datasheet and certification schedule are available now.
Where do the cracker capacities on this page come from?
From trade press describing the Map Ta Phut crackers, not from SCGC. Use SCGC's own published figures for any engineering decision.
Why mention a 2024 fire at a Map Ta Phut tank?
Trade press reported that a pyrolysis gasoline tank fire at Map Ta Phut in May 2024 led SCG to declare force majeure on cracker output. Events like that keep tank and transfer areas under close review and are why site teams ask hard questions about anything carried into them.
Enquiry · SCG Chemicals
Ask about the IS-04Z1 for SCG Chemicals, Thailand
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 Thailand. 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 · SCG Chemicals
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.