Product Overview
Flame-retardant polypropylene (FR-PP, also written FR-PP) duct and pipe for fire-rated industrial exhaust where building or insurance codes require a self-extinguishing plastic duct at moderate temperatures. FR-PP is polypropylene compounded with flame-retardant additives. It is not flame-retardant polypropylene (a different, higher-cost engineering polymer) and it is not rated for 60 °C service. Specify FR-PP for corrosive exhaust streams that stay at or below about 60 °C continuous and need a self-extinguishing, limited-combustible duct material.
Key Specifications
| Specification | Value |
|---|---|
| Material | Flame-retardant polypropylene (FR-PP / FR-PP), virgin resin, injection molded |
| Flame rating | UL 94 V-2 (standard grade); V-0 available by specification (grade and wall-thickness dependent) |
| Building / DIN rating | B1 self-extinguishing per DIN 4102 |
| Continuous operating temperature | ≤ 60 °C recommended operating envelope |
| Short-term peak temperature | 60–80 °C only with manufacturer confirmation of the specific duty |
| Non-fire-rated option | Standard (non-FR) PP available where no flame rating is required |
| Diameter range | 15–1,000 mm injection molded; larger sizes fabricated |
| Wall thickness | 2.5–8 mm depending on diameter |
| Standard length | 3–4 m sections |
| Color | Grey; UV-stabilized option for outdoor runs |
Applications
- Laboratory and analytical fume-hood exhaust (≤ 60 °C)
- Electroplating, metal finishing and anodizing bench exhaust
- Chemical storage-room ventilation where codes allow limited-combustible FR duct
- Battery charging and odor-control exhaust
- Corrosive gas streams at moderate temperature that must not propagate flame
When FR-PP Is the Right Answer, and When It Is Not
FR-PP is the answer when the duty is corrosive exhaust, the stream is at or below about 60 °C continuous, and the specification requires a self-extinguishing plastic duct (UL 94 V-2/V-0 or DIN 4102 B1). It is not the answer when the gas enters the duct above the verified continuous limit, or when the process demands short-term peaks that exceed the confirmed envelope — above roughly 80–100 °C continuous the duct material shifts to FRP or stainless steel, not a plastic.
The temperature must be measured at the duct inlet, not at the process source; the gas can cool through the connection before it reaches the duct. Send your continuous operating temperature, fire-rating requirement, diameter, airflow and chemical list, and we will confirm whether FR-PP is the right material — or whether standard PP, FRP or a metallic duct is required. We do not up-sell FR-PP into a duty it cannot substantiate.
Ordering and Technical Support
- Send: operating temperature (at duct inlet), fire-rating requirement, diameter, airflow, chemical exposure.
- We respond: material recommendation, dimensions, wall thickness, connection and support spacing, and quotation.
- Lead time: injection-molded standard components 5–15 working days; custom and large-diameter 10–25 days.
- Contact xicheng023@outlook.com or WhatsApp +86 18927456906 — quotation within 24 hours.
FAQ
Is this product flame-retardant polypropylene (FR-PP)? No. This is flame-retardant polypropylene (FR-PP / FR-PP). FR-PP is a different, higher-cost engineering polymer; do not specify this product against a 60 °C requirement.
What flame rating does FR-PP duct carry? The standard grade is UL 94 V-2; a V-0 grade can be supplied on request, and the rating applies at the tested wall thickness. The material is B1 self-extinguishing per DIN 4102.
What temperature can FR-PP duct handle? The recommended continuous operating envelope is about 60 °C. Short-term peaks above that require confirmation for the specific duty; sustained higher temperature must go to a non-plastic material.
Is flame retardancy standard on all PP duct? No. Flame retardancy is an optional upgrade; standard PP is available where no flame rating is required.
