Flame retardant additives, masterbatch and ready-to-extrude compounds for building material producers — pipes and profiles, panels, ceiling and wall systems, cable management, membranes. Engineered against the standard your specifier actually names: ASTM E84 Class A, EN 13501 Euroclass, or your market’s equivalent.
Fig. BM01 — compounding for construction volumesBuilding products run in tonnage. Batch consistency is the requirement behind the requirement.
Most plastics are flame retarded to UL94 — a small bar, a small flame, a bench test. Building products are judged by full-scale tests on the installed assembly, with a smoke limit that is usually harder to clear than the flame limit, and a service life measured in decades rather than years.
Both ASTM E84 and EN 13501 impose a smoke limit alongside flame spread. Burning polymer smokes far more than the wood baseline these tests are calibrated against — so panels routinely pass flame spread and fail on smoke.
Facing, adhesive, air gap and substrate all participate in a building fire. A compliant core behind a combustible facing can produce a fire no material certificate predicted.
A cable conduit installed today may still be in a wall in 2060. Flame retardant that migrates out over that period takes the fire performance with it — a risk most sectors never have to price in.
These systems are not convertible into one another. A project selling into both North America and Europe needs both tests run — budget for that at the start, not after the first certificate.
| Standard | Region | What It Measures | Common Target |
|---|---|---|---|
| ASTM E84 / UL 723 | North America | Flame spread + smoke in a Steiner tunnel | Class A — FSI ≤25, SDI ≤450 |
| NFPA 286 | North America | Full-scale room corner burn | Required where foam plastic is left exposed |
| EN 13501-1 | Europe | Reaction to fire, with smoke and droplet sub-classes | Euroclass B-s1,d0 typical for facades |
| GB 8624 | China | Combustion performance grading | B1 grade common for interior products |
| UL94 | Global | Bench-scale bar test | Useful for pre-screening only — not a building spec |
The last row is worth stating plainly: a UL94 V-0 rating does not make a product Class A, and a supplier quoting one when your specifier asked for the other has answered a different question. We use UL94 and LOI to pre-screen formulations cheaply at our partner factory’s lab, then you certify the finished article at a tunnel lab — the full mechanics are in our guide to ASTM E84 Class A.
Six building product families where a compounded polymer carries the fire requirement — and an honest note on where our supply ends.
| Product Family | Typical Polymer | Usual System | Related Page |
|---|---|---|---|
| Pipes, ducts & profiles | PP, PE, PVC | Intumescent APP; smoke suppressants in PVC | FR PP pipe & sheet |
| Wall & ceiling panels, liners | PP, PVC, composites | Mineral loading or intumescent, smoke-driven | PVC flame retardant |
| Cable management & conduit | PVC, PP, PA | Halogen-free where LSZH policy applies | LSZH compounds |
| Membranes, tarpaulin & coated fabric | PVC-coated polyester | Phosphate ester plasticizer + ATH + synergist | FR tarpaulin |
| Foam insulation (polyolefin) | PE, PP foam | Intumescent or mineral, compounded before foaming | FR insulation guide |
| Wood-plastic composite (WPC) | PP/PE + wood flour | Intumescent systems; high filler already present | — |
Where our supply ends: we do not make finished building products, and we do not supply PolyFR for EPS/XPS board or reactive polyols for PU/PIR foam — those come from specialty polymer producers, not an additive compounder. If your project needs those, we will say so in the first email instead of selling you something adjacent.
The smoke limit and the long service life between them narrow the field considerably — which is why construction formulations look different from electronics formulations.
The default for smoke-critical work. MDH and ATH release water instead of soot, cooling the substrate and diluting fuel gases — the cleanest smoke profile available, at the cost of 50–65% loading.
Where mineral loading would wreck a thin profile, an APP-based intumescent package builds a foamed char at 18–25% and shuts the flame front down with far less filler.
Rigid PVC self-extinguishes on its own chlorine, so building profiles usually need smoke controlled rather than flame — zinc borate or zinc stannate with ATH.
Give us these nine and we can propose a real system rather than a catalogue page.
Construction runs in tonnage and certifies once. Both facts put batch consistency ahead of almost everything else — a certificate earned on one batch has to hold for every batch after it.
Fig. BM02 — bench pre-screeningCheap screening before expensive full-scale testing.
Fig. BM03 — tonnage supplyBig bags and palletized delivery for construction volumes.Direct answers for technical and procurement teams in construction supply.
In North America, ASTM E84 Class A for most exposed interior surfaces — flame spread index ≤25 and smoke developed index ≤450. In Europe, an EN 13501-1 Euroclass, typically B-s1,d0 or better for facades and escape routes. Foam plastics left exposed generally need full-scale room corner testing such as NFPA 286 rather than E84 alone.
Because both test systems impose a smoke limit, and burning polymer smokes far more than the wood baseline they are calibrated against. It is the reason gas-phase halogen chemistry — the most efficient per kilogram — is often the wrong answer here, and mineral or char-forming systems dominate.
No, and conflating them is a common and expensive error. UL94 is a bench-scale bar test for moulding materials; Class A comes from a full-scale tunnel test on the building product as installed. A V-0 compound is a promising starting point, not a certification.
No. We supply the flame retardant layer — additives, masterbatch and compounds — to producers of pipes, panels, profiles, membranes and foam. We also do not supply PolyFR for polystyrene board or reactive polyols for PU/PIR systems; those come from specialty polymer producers.
Often yes, but it has to be designed for both from the start and tested under both — the two systems are not convertible, and neither certificate substitutes for the other. Formulate against the stricter target and budget for both tests rather than retrofitting after a failure.
Tell us the standard your specifier named, the destination market, your polymer and profile, and the process you run. We will propose a system, pre-screen it in our burn lab, and tell you honestly what is achievable before you book full-scale testing.