An expandable event trailer is a building for the hours it is open. Once it stands inside a hall, at an exhibition or on a site with a permit condition, the question that decides whether it may be used is not how it looks — it is what the wall panels, the roof and the floor are classified as when they meet a flame. Reaction to fire is a paperwork subject as much as a materials one, and the buyer is usually the one who has to produce the paperwork.

This is written for the buyer specifying an expandable venue into a regulated market: an importer, a rental fleet owner, a venue operator, or a company commissioning a mobile restaurant or dining unit. Two classifications matter, they come from two separate documents, and an answer such as "our panels are fire-retardant" addresses neither.

Why the Classification Lands on the Buyer

A manufacturer sells a structure; the market it is used in decides what that structure has to evidence. When a unit is placed in a public hall, at an exhibition or under a permit, the authority or the venue's insurer asks for the reaction-to-fire class of the interior linings and of the floor covering, with the report behind it. That requirement travels with the market, not with the factory, so the party placing the unit into that market holds the document. Raise it after delivery and you are re-specifying panels and flooring on a finished unit.

Two Classifications, Not One

The European system rates reaction to fire from A1 to F, with suffixes for smoke production (s1 to s3) and flaming droplets (d0 to d2). A lining specification commonly asks for something around B-s1,d0 — limited contribution to fire, limited smoke, no flaming droplets. Floor coverings are classified separately under their own designation, again with a smoke suffix, and a commercial floor requirement is often written as Cfl-s1. Two classifications, two test reports, and one does not stand in for the other: a panel report says nothing about the floor, and a floor report says nothing about the wall.

What a B2 Rating Does and Does Not Tell You

Chinese material classification uses its own scale, where B1 and B2 describe fire behaviour under different test methods. The wall and roof panels we use are 50 mm polyurethane insulated sandwich panels, and the interior materials are B2 fire-retardant rated. That rating is a real property of the material, but it is not a Euroclass — the two regimes test differently and their classes do not convert by name, so a B2 designation does not read across as B-s1,d0 and should never be presented as though it does. The honest position is to state what the panel is and hand over the data your laboratory or authority needs to assess it, which is the approach we take across our expandable venue system: panel build-up, frame grades, drawings and weight data, supplied as documents rather than as adjectives.

What the Manufacturer Can Hand Over, and What It Cannot

A factory can supply the panel build-up by layer with insulation type and thickness, the steel grades of the frame, the flooring product specification, and any test reports its panel supplier holds, in a form a laboratory or consultant can work from. What it cannot do is issue a European classification in its own name, or decide whether a report from an overseas laboratory will be accepted in your market. That acceptance is the destination authority's call, usually through a recognised body in that country, and it differs from market to market — so write it that way into the file.

What to Put in Writing Before You Order

Ask for these as documents, not as assurances:

• Panel build-up — every layer, with insulation type and thickness.
• Panel classification — named with the test standard it was assessed against.
• Floor covering — the product by name, with its own separate classification.
• Reports and acceptance — who issued each one, and whether your market accepts it.
• Technical file — who signs it for your market.
• Scope — which items the manufacturer supplies, and which stay with you.

A supplier who answers all six in writing is one you can plan a season around. A supplier who answers with a single reassuring adjective has not answered at all.

Put the material build-up and the class your market asks for into one written brief, and the panel and flooring specification can be confirmed against it before production starts. Send that brief to [email protected]; for a quick read on whether a particular class is achievable for your project, WhatsApp: +86 186 6381 3961. Model sizes and floor areas are published at www.lgloader.com.

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