Halogen-free Flame Retardant
Flame Retardant Definition
Combustion could occur when a substance is heated to its flammable temperature in the presence of oxygen. Flame retardants are generally designed to provide a particular level of resistance to ignition or flame spread. This is achieved by suppressing oxygen availability, building up of char at the surface, inhibiting the combustion reaction within the flame area, or by other mechanisms. Nearly all the present-day commercial FRs and smoke suppressants can be divided into several chemical groups as the table below.
Halogen-free Flame Retardant
Halogen-free flame retardants also known as Non-halogenated flame retardants, HFFR, include phosphorus and nitrogen compounds while do not contain bromine and Chlorine.
Nitrogen flame retardant
Nitrogen-containing flame retardants may act by the release of inert gases like ammonia and nitrogen into the gas phase or by condensation reactions in the solid phase.
| Name | CAS No. | Feature |
| MCA | 37640-57-6 | Melamine Cyanurate Is a Halogen‐Free Flame-Retardant For Polyamide Used In Electrical & Electronic Application. Grade MCA8, MCA15, MCA25 |
Phosphorus-based flame retardant
PFRs not only react with the radicals like BFRs but are also able to act in the condensed phase by enhancing char formation, yielding intumescence (foaming-up) or formation of inorganic glasses. In fact, PFRs are most commonly known as char formers, because during the burning process they produce phosphoric acids, which, reacting with the substrate, produce a char that acts as a protection of the substrate itself. The most used PFRs are as the table below, their main area of application is in polyamides(PA), polyesters(PET/PBT), polyolefins, and polystyrene (PS) formulations, especially in electrical and electronic insulation components.
Name | CAS | Chemical name | Feature |
225789-38-8 | Aluminum Diethylphosphinate | flame retardant for engineering plastics such as polyamides, polyesters | |
784-22-7 | Aluminum Hypophosphite | FR for Synergistic for PE, PP, PVC, XPS, EPS | |
115-86-6 | Triaryl phosphates | TPP Is a Halogen Free Flame Retardant Plasticizer For Phenolic Resin, Vinyl Resin, And Rubber. | |
5945-33-5 | Bisphenol-A bis(diphenyl phosphate) | BDP A Halogen Free Bisphosphate Flame Retardant Used For PC/ABS, PPO/HIPS, and Epoxy Resins. Synonym BAPP | |
57583-54-7 | Resorcinol bis(diphenyl phosphate) | RDP is a Halogen Free Phosphate Ester Flame Retardant Used For PC/ABS, PPO/HIPS. Replace FP 600 | |
13674-84-5 | Tris(chloropropyl) | TCPP Flame Retardant Is Used In the Production of Acetate Fiber, PVC, PU Foams, EVA, and Phenolics Materials. Replace PCF | |
68333-79-9 | Ammonium | APP Is An Ammonium Polyphosphate Flame Retardant Mainly Used In Plastic, Paint, Coating, Laminates, And Reinforced Materials. Replace 484, 486, C60, C30, and 3167 | |
218768-84-4 | Melamine | Melamine Polyphosphate Flame Retardant Is Mainly Used In PA And PBT, Especially PA6, and PA66. | |
66034-17-1 | Piperazine Pyrophosphate | FR for polyolefins, PP | |
78-51-3 | Tris(2-butoxy ethyl) phosphate | Plasticizers, FR | |
115-96-8 | Tris(2-chloroethyl) phosphate | FR for fabrics and cellulose acetate | |
78-43-3 | tris(1,3-dichloropropyl) phosphate | FR for unsaturated polyester, polyurethane foam, |
Antimony trioxide flame retardant
Antimony oxide produces vapor-phase radical scavengers while used as a flame retardant. Antimony halides appear to form an important link in the radical scavenging cycle during flame retardancy. Antimony trioxide(Sb2O3) and pentoxide(Sb2O5) are used along with halogen flame retardant additives or halogenated polymers due to their synergistic interaction arising from the formation of antimony trihalide
| Name | CAS No. | Chemical name | Feature |
| Sb2O3 | 1309-64-4 | antimony trioxide 99.5/99.8/99.9 | Sb2O3 Is Used As A Fire Retardant In Rubber, Plastics, Wire & Cable And Other Composites, Various Purity, |
Silicon flame retardant
organo-layered silicate with the ability to incorporate polymers between the layer structures by intercalation or exfoliation. They do not act as flame retardants on their own, but may, together with other flame retardants, enhance the charring and reduce the heat release of the polymer. The only commercial application to date is the cable sector.
| Name | CAS No. | Chemical name | Feature |
| POSS | / | Polyhedral Oligomeric Silsesquioxane | POSS Flame Retardant Is A Silsesquioxane With Excellent Heat Resistance, Hydrolysis And Weather Resistance. |
| / | / | Nano silicone | Nano-Silicone Is A New Type Of Flame Retardant Treated By Ultra-Fine Nano Surface Treatment. Excellent Heat, Flame, and Hydrolysis Resistance. Recommended For PC, PC/ABS. |
Sulfonate flame retardant
KSS FR is the potassium salt of a complex of diphenyl sulfone sulfonate and diphenyl sulfone sulfonate. HES FR is specifically designed for the most effective translucent and opaque PC. It is not intended for a transparent PC.
| Name | CAS No. | Chemical name | Feature |
| HES | / | sulfonates | HES- FR Is An Efficient Sulfosalt Flame Retardant, Mainly Used In PC, PC/ABS. Replace HES-FR. |
| KSS | 63316-43-8 | Potassium 3-(phenylsulfonyl) benzenesulfonate | KSS Is An Eco-Friendly Halogen-Free Flame Retardant For PC And PC Alloys. Replace KSS-FR |
Flame Retardant Blend by Application
| Resin Type | Name | Tests | Application |
| PP | FR PP V0 GWFI | UL94 V-0, GWIT750°C, GWFI 960°C | PP products, such as warm air blowers, electrical sockets, wind turbines, and wind drum |
| PP | FR PP V0 A | UL94 V-0, DIN 4102 B1, BS 5852, GB 5455 | PP products, also adhesives or sealants, Papers, Coating fabrics |
| PP | FR PP V0 NA | UL94 V-0, UL1581 VW-1, GWIT750°C, GWFI 960°C | Wire, Headphone cable, Plug， Power cable, Rice cooker, Toilet lid, Interior accessories of Bullet train |
| PP | FR PP V2 | UL94 V-2, GWIT 750°C, GWFI 850°C | Electronic appliance socket and structure, auto parts |
| PP | FR PP V2 MB | UL94 V-2, GWIT 750°C, GWFI 850°C | Electronic appliance socket and structure, auto parts |
| PE | FR PE MB | PE extrusion | |
| PE | FR LDPE MB | LDPE film | |
| PA | FR PA V0 | UL94 V-0, GWFI 850°C | Glass fiber-reinforced nylon products, such as electrical tools |
| PBT | FR PBT V0 | UL94 V-0, GWIT 750， GWFI 960°C | Electrical socket, Switch, Junction box, etc. made from PBT with FR |
| TPE | FR TPE V0 | UL1581 VW-1 | Communication cables, Computer wires, Cell phone charging lines, Earphone wires, Automotive wires, etc. |
| TPU | FR TPU V0 | UL1581 VW-1 | Communication cables, Computer wires, Cell phone charging lines, Earphone wires, Automotive wires, etc. |
| Epoxy Eesin | FR EP V0 | UL94 V-0 | epoxy resin |
| Fabric Coating | FR FC V0 | GB 17591 B1, GB 8965.1 A, GB 50222 B1, BS 5852, GB 5455 | Fabric coatings, etc. |
| Paper | FR P B1 | B1 | Paper, leatherwear, fabric, wood |