The project specification says "BlueScope steel skin". The supplier's quotation says the same. The panels arrive, get installed, and the finish looks clean. The question is: how do you know the steel inside those panels is really BlueScope?
This guide is for contractors, factory owners, and warehouse or cold storage managers who want to make sure their sandwich panels match the order. It covers where the coil's authenticity mark sits, when to check it, and what to write in the order so nothing is left open to interpretation.
Why panels can look identical while the steel differs
A sandwich panel is two steel sheets (skins) bonded to a core such as PU, PIR, EPS, or Rockwool. From the outside, all you see is the painted surface. Panels made from coil supplied by two different mills can share the same colour, nominal thickness, and joint profile.
Once the panel is made, the reverse side of the steel is bonded to the core. That reverse side is where the coil's identity mark is printed. So when the panel is finished, the evidence of where the steel came from is covered as well.
For buyers, this means one thing: the coil brand cannot be confirmed from a finished panel. The check has to happen while the coil is still exposed.
Where the BlueScope authenticity mark is
NS BlueScope Indonesia prints product identification on the reverse side of its coil. The official KIRANA® brochure (September 2025) asks buyers to check the brand print along the back edge of the coil to identify the product and confirm it is genuine. The sample print reads: "KIRANA® diproduksi oleh NS BlueScope Indonesia hh:nn dd:mm:yyyy SNI 8305:2019".
From that example, the print contains four items:
- the steel product name (for example KIRANA®);
- the producer, NS BlueScope Indonesia;
- the hour and date of production;
- the product's Indonesian National Standard (SNI) number.
The exact format differs between BlueScope products, so always use the brochure or data sheet of the product you ordered. The KIRANA® brochure is available on the official NS BlueScope Indonesia page. The same brochure lists an AZ100 coating made of 55% aluminium, 43.5% zinc, and 1.5% silicon.
Overclaim and missed specification: two sources of trouble
Material that does not match the order usually comes from one of two routes.
Overclaim specification. The panel is said to use a certain brand or grade, but the supplier cannot show any proof. The claim exists only in marketing material or a sales conversation.
Missed specification. The order was correct, but the information changed along the way. Sales explains one specification to the contractor, the contractor passes it on to the owner, and the production floor receives an instruction that is not quite the same. Nobody meant to cheat, yet the result is still wrong.
The outcome is the same for everyone. The owner receives material outside the contract. The contractor faces complaints and may have to replace panels. The supplier loses the customer's trust.
A checklist before and during production
Use these steps whenever you order sandwich panels with a specific coil brand requirement:
- Write the full specification in the order. "BlueScope steel" is not enough. State the steel product name, coating class (for example AZ100), steel thickness, core type and density, and total panel thickness.
- Keep documents identical. The specification in the quotation, the purchase order, and the order confirmation must match word for word. A small difference in one document is a common cause of missed specification.
- Ask for coil evidence. Request photos of the reverse-side print on the coil used for your order, or visit the factory during production.
- Ask how material is recorded. A serious supplier can explain how a coil is tracked from the warehouse to the panels in your order.
- Check on delivery. Compare the delivery note and panel labels with your purchase order before the panels are unloaded and installed.
- Keep every record. Coil photos, order documents, and test reports become your evidence if the building owner or an auditor asks questions later.
More tips on assessing suppliers are in our guide on how to choose and verify a sandwich panel supplier.
Coil brand is only one of many specifications
Coil brand makes a good example because the mark is printed clearly. Other specifications matter just as much and are just as hard to check once the panel is finished: steel thickness, coating class, core density, and fire resistance.
For those, a photo is not enough. Ask for the steel product data sheet and test reports from an accredited body. For fire resistance, for example, ask for a test report to SNI 1741. Core options and their properties are covered in our article on PIR core material and its use in sandwich panels.
Material records do not replace quality testing. Their job is to link documents, materials, and delivered goods so that everything can be checked again.
How SandwichPanels.id records material
SandwichPanels.id panels are made at our factory in Cikarang, West Java. Raw material coil is recorded in our stock system with its serial number. Every coil that leaves the warehouse for the production line is recorded on a material slip, and production runs on work orders created from customer orders. With these records, the coil used for your order can be traced back to that order, and the specification stays the reference until the panels are finished.
You are welcome to ask for photos of the reverse-side print on the coil used for your order, or to visit the factory while your panels are being produced.
Our panels are available from 50 to 150 mm thick with PU, PIR, EPS, and Rockwool cores, for walls, partitions, and room ceilings. See the full range on the SandwichPanels.id products page.
FAQ
Where can I find the authenticity mark on BlueScope coil?
Along the back edge of the coil, according to the official NS BlueScope Indonesia brochure. The print shows the product name, the producer, the hour and date of production, and the SNI number.
Can the coil brand be checked on panels that are already installed?
Hardly. The reverse side of the steel is bonded to the core, so the print is covered. The check should be done when the coil arrives at the factory or during production.
What should the purchase order state so the specification does not slip?
The steel product name, coating class, steel thickness, core type and density, total panel thickness, and joint type. Make sure the same wording appears in the quotation and the order confirmation.
Is a photo of the coil print enough proof of quality?
No. The photo proves where the steel came from. For thickness, density, and fire resistance you still need product data sheets and official test reports.
Production process video
This short video from our factory shows the BlueScope coil label and identity print, the system records, and the label on the finished panel. Click the image to watch it on YouTube.
Planning a project that requires a specific coil brand? Tell us about your wall, partition, or ceiling needs and our team will prepare a fully written specification and quotation. Send your requirements through the SandwichPanels.id contact page.
