PP Flame Retardant Sheet — Fire-Rated Material, Not Just a Fire-Rated Product
A flame-retardant sheet is not standard PP with a coating. The fire resistance is built into the polymer itself — a phosphorus-nitrogen flame retardant system compounded into the PP resin before extrusion. When exposed to flame, the FR additives promote char formation on the sheet surface, which insulates the underlying polymer and starves the combustion zone of fuel. The sheet self-extinguishes — typically within 10 seconds of flame removal — and does not produce flaming drips that could ignite materials below.
This is the material distinction that separates PPBOXY’s FR sheet from commodity PP sheet: it is sold as a material grade with documented fire test performance, not as a finished product. Fabricators, converters, and OEM manufacturers buy FR sheet to make things — partitions, enclosures, vehicle interior panels, electrical housings. PPBOXY supplies the FR sheet material with full test certification; the fabricator builds the end product.
For finished FR board applications in construction and signage, see PP Flame Retardant Board →, which covers application-specific formats including wind load ratings and print compatibility. For the complete PP sheet type comparison, see PP Sheet →.
| What You Need |
Best Page |
Go To |
| FR sheet material for fabrication — raw material with test certs |
UL 94 / LOI / EN 13501 specs, processing guide |
This page |
| FR board for construction partitions — finished application |
Wind load, print compatibility, building code references |
PP Flame Retardant Board → |
| Standard (non-FR) sheet |
For applications without fire rating requirements |
PP Sheet → (navigation hub) |
技术规格
| Parameter |
Specification |
| Product |
PP Flame Retardant Sheet — UL 94 V-0 halogen-free FR polypropylene sheet |
| 材料 |
Polypropylene (PP) + halogen-free phosphorus-nitrogen flame retardant system |
| 结构 |
Twin-wall corrugated (fluted) PP sheet |
| UL 94 Rating |
V-0 — self-extinguishing < 10 s (vertical burn test, 3.0 mm and above) |
| Glow Wire Flammability Index (GWFI) |
960 °C (3.0 mm) |
| Limiting Oxygen Index (LOI) |
28–32% (standard PP: ~17%) |
| EN 13501-1 Classification |
B-s1,d0 (limited combustibility, low smoke, no flaming droplets) |
| Halogen Content |
Halogen-free — IEC 61249-2-21 compliant |
| Toxic Gas Emission |
No hydrogen halide (HCl, HBr), hydrogen cyanide (HCN), or hydrogen fluoride (HF) release during combustion |
| Thickness Range |
2–10 mm |
| Standard Sheet Size |
1,220 × 2,440 mm (4 × 8 ft) |
| Custom Sizes |
Up to 2,100 × 6,000 mm |
| Density |
0.60–0.92 g/cm³ |
| 颜色选项 |
White, black, grey (standard); custom on request |
| Tensile Strength |
≥ 18 MPa |
| Impact Resistance |
≥ 10 kJ/m² |
| Water Absorption |
< 0.01% |
| Operating Temperature |
−20 °C to +80 °C continuous |
| UV Resistance |
Standard UV stabiliser included (2–3 years outdoor) |
| 可回收性 |
100% PP #5 (FR additives do not interfere with PP recycling stream) |
| Fabrication |
CNC routing, die-cutting, scoring and folding, heat bending (160–180 °C), hot air / ultrasonic welding, screen / UV digital printing |
| Certifications |
UL 94, IEC 61249-2-21 (halogen-free), EN 13501-1 test reports, REACH, RoHS |
| 最小起订量 |
无 |
| Lead Time |
7–14 business days |
How FR PP Sheet Achieves V-0 Without Halogens — The Phosphorus-Nitrogen System
Traditional flame retardants — brominated and chlorinated compounds — work by releasing halogen radicals that interrupt the combustion chain reaction in the gas phase. They are effective but problematic: the gases released (hydrogen chloride, hydrogen bromide) are toxic and corrosive, and halogenated FR additives are increasingly restricted under EU RoHS, REACH, and WEEE directives.
PPBOXY’s FR sheet uses a halogen-free phosphorus-nitrogen intumescent system that works through a completely different mechanism:
1. Char Formation (Condensed Phase)
When heated, the phosphorus compound decomposes to form phosphoric acid, which catalyzes the dehydration of the PP polymer into a carbonaceous char. The nitrogen compound decomposes to release inert gases (N₂, NH₃) that swell the char into a thick, insulating foam layer. This char layer physically separates the underlying polymer from the flame and oxygen.
2. No Flaming Drip
Standard PP melts and drips when exposed to flame — the dripping molten polymer can ignite materials below, spreading the fire vertically. The char layer formed by the FR system prevents the underlying polymer from melting and dripping. UL 94 V-0 certification requires zero flaming drips.
3. Low Smoke, No Toxic Gas
Halogenated FR systems produce dense, toxic smoke. The phosphorus-nitrogen system produces significantly less smoke (EN 13501-1 smoke classification: s1, the best possible rating) and no hydrogen halide gases. This is critical for applications in occupied spaces — building interiors, transit vehicles, public venues — where smoke inhalation, not flame contact, is the leading cause of fire fatalities.
Why “Halogen-Free” Matters Halogen-free compliance (IEC 61249-2-21: < 900 ppm total chlorine, < 900 ppm total bromine, < 1,500 ppm total halogens) is increasingly a procurement requirement for: EU construction products under Construction Products Regulation (CPR), transit vehicle interiors per EN 45545-2, electronic equipment enclosures per IEC 62368-1, and green building certifications (LEED, BREEAM, DGNB).
Fabrication — How to Process FR PP Sheet
FR PP sheet machines similarly to standard PP — the same tools, the same techniques — with minor adjustments:
| Process |
FR PP Sheet Behavior |
Notes |
| CNC Routing |
Standard — use same feeds and speeds as standard PP |
FR additives have negligible effect on machinability |
| Die-Cutting |
Standard |
Clean edges — no FR residue |
| Score & Fold |
Standard — score along flute direction |
Fold radius may be slightly larger than standard PP at ≤ 4 mm |
| Heat Bending |
160–180 °C — same as standard PP |
FR system does not affect thermoforming temperature range |
| Hot Air Welding |
Standard — PP welding rod compatible |
FR PP rod available for color-matched welds |
| Screen Printing |
Standard — corona treat to ≥ 38 dyne |
FR surface accepts ink identically to standard PP |
| UV Digital Printing |
Standard — corona treatment recommended |
Full-color, photo-quality graphics on FR substrate |
| Laser Cutting |
⚠️ Not recommended |
FR additives may produce char edge that requires post-processing; CNC preferred |
常见问题解答
Q: What is the difference between this FR sheet page and the PP Flame Retardant Board page?
本页面介绍阻燃聚丙烯（FR PP）板材作为一种材料等级——包括 UL 94 / LOI / EN 13501 测试规范、无卤阻燃化学成分以及加工方法。本页面面向需要采购阻燃板材来制造自身产品的买家。 “阻燃聚丙烯（PP）板”页面主要介绍成品阻燃板的应用场景——如建筑隔断、公共交通车辆内饰、展会展位墙板等——并提供风荷载等级和印刷兼容性等针对具体应用的信息。如果您正在采购用于加工的原材料，那么您访问的正是本页面。.
Q: Is UL 94 V-0 the same as “fireproof”?
不——而且这一区别很重要。UL 94 V-0 意味着该材料在火焰移开后10秒内会自行熄灭，且不会产生带火花的滴落物。这并不意味着该材料不会燃烧——没有任何一种聚丙烯是不可燃的。 V-0 意味着该材料具有抗点燃性，能迅速自熄，且不会通过滴落物蔓延火势。对于需要使用不燃材料的应用场景（例如建筑结构构件），必须使用矿物基板材（如硅酸钙、氧化镁），而非聚丙烯（PP）。.
Q: Is the FR sheet halogen-free?
Yes. PPBOXY’s FR sheet uses a phosphorus-nitrogen intumescent flame retardant system that contains no bromine, chlorine, or other halogens. It complies with IEC 61249-2-21 halogen-free requirements (< 900 ppm Cl, < 900 ppm Br, < 1,500 ppm total halogens). This is important for EU construction products, transit vehicle interiors, and green building certifications that increasingly require halogen-free materials.
Q: Can FR PP sheet be recycled?
是的。含磷、含氮的阻燃添加剂不会对PP #5回收流造成干扰。 阻燃聚丙烯（FR PP）板材可与标准聚丙烯（PP）一同进行粉碎、造粒和再挤出。与含卤阻燃体系不同，在再加工过程中不会产生腐蚀性气体。PPBOXY接受大宗客户退回的废旧阻燃板材进行回收利用。.
Q: What thickness should I use for a construction partition or electrical enclosure?
建筑隔断：标准墙面保护采用5–6毫米；结构隔断和高人流量区域采用8–10毫米。电气外壳：内部组件隔离层采用3–5毫米；需要抗冲击性能的外部外壳采用6–8毫米。 请向PPBOXY提供您的具体耐火等级要求、跨度和荷载条件，以便获得厚度建议。.
Q: What is the minimum order quantity?
We do not have a strict minimum order quantity. Whether you need a small trial order or a large-volume shipment, we can accommodate your requirements. Contact us with your preferred specifications, quantity, and destination, and our team will provide a customized quotation and the most cost-effective shipping solution.
