Fire class follows thickness on the sheet

Procurement that searches soft porcelain or flexible stone often asks for a fire class before the series is named. The class does not live in the search phrase. It lives on the thickness and formulation of the sheet that will face the wall. Write the series first. Then lock the class to the current data sheet of that series. Skipping that order is how a tender ends up with a Class A line beside a face that never carried it.

What the thickness band allows

On the current mix the mineral flexible stone sheet is 2–4 mm thick and weighs 3–8 kg/m². Fire class follows thickness. Above 3 mm the path is Class A. Below 3 mm the coating-type rule on that sheet applies. Change the series and both the mass and the class can change with it. A cutting from a thicker sample does not transfer its class to a thinner order. Write the band into the specification, then replace the band with the measured thickness on the data sheet of the series being sampled.

Do not copy a class from a journal note into a tender. Do not borrow a class from a brochure photograph. The only class that belongs in the specification is the one printed for the series being sampled, on the data sheet in front of you. If the sheet in the crate is thinner than the sheet in the photo, reopen the fire line before the wall is released.

Where tenders go wrong

Tenders fail when the architect writes Class A beside a 2 mm face, or when the contractor swaps series after award and keeps the old class. Insulated walls and overlay renovations make the mistake more expensive because the facing and the substrate move together. Confirm thickness, mass, and fire class as one package. If the elevation needs Class A, stay above 3 mm on a series that carries that path on its current data sheet. If the elevation can accept the coating-type rule, say so in plain language so nobody upgrades the claim later for marketing.

Quiet cast planes such as Cement Panel keep the fire discussion readable: one mineral skin, one thickness, one class. Travertine and Ripple Panel follow the same rule. The look changes how the wall reads. It does not invent a second fire path. Soft porcelain as a buyer name still points at this mineral sheet. It does not invent a ceramic fire certificate either.

Sample a quiet plane on the look board, starting with Cement Panel, then lock thickness and fire class to that series data sheet.

Before the class is written into the file

Ask for the current data sheet and a mill-run sample of the look that will actually face the wall. Measure the sample thickness against the band you wrote. If the sample is below 3 mm, do not keep a Class A line from a thicker brochure. If the sample is above 3 mm, confirm Class A is still the path on that series sheet. Soft porcelain as a buyer search does not carry a fire class. The sheet does. Keep adhesive and primer on the same page as the fire line so the system and the skin stay one specification.

Keep the sample, the data sheet, and the elevation detail in one file. When the series changes, reopen the class. When the thickness changes, reopen the class. That is the whole note — not a second set of invented percentages, and not a certificate number copied from another wall. Zhongshan can ship the sheet; the file still has to name the class that sheet actually carries.

See the look board, or request a sample and the current data sheet.