Description
Product Overview
PPS (polyphenylene sulfide) flame retardant pipe for fire-rated ventilation, high-temperature exhaust, and industrial ductwork where building codes require non-flammable material or where operating temperatures exceed the limits of PP and PVC. PPS is inherently flame retardant — unlike PP and PVC which require additive flame retardants that can leach over time — achieving UL 94 V-0 (self-extinguishing within 10 seconds, no flaming drips) with a limiting oxygen index (LOI) of 44% per ISO 4589, and continuous service temperature of 200degC. Injection molded up to 1,000 mm diameter, with larger sizes fabricated from PPS sheet.
| Application | Fire-rated ventilation ductwork, high-temperature industrial exhaust (up to 200degC), chemical plant exhaust, semiconductor process exhaust, tunnel and underground ventilation, building code-compliant duct systems |
| Material | PPS (polyphenylene sulfide) — inherently flame retardant, no additive leaching; UL 94 V-0, LOI 44% |
| Temperature rating | Continuous service: 200degC; short-term: 260degC |
| Diameter range | 15 mm to 1,000 mm (injection molded); larger sizes fabricated from PPS sheet |
| Wall thickness | 2.5 mm to 8 mm depending on diameter |
| Color | Dark Grey / Black (natural PPS color) |
| Lead time | 15-25 days |
Why PPS for Fire-Rated Ductwork
Fire safety in ventilation systems is not optional — building codes in most jurisdictions require duct materials passing through fire-rated walls, floors, or shafts to meet specific flame spread and smoke development limits. PPS is engineered for these applications where PP and PVC are not acceptable, meeting NFPA 90A and ASTM E84 Class A requirements (flame spread ≤25, smoke development ≤50):
- Inherently flame retardant — no additive depletion. PP and PVC achieve flame retardancy through additive chemicals (brominated compounds, antimony trioxide) mixed into the resin. These additives can migrate out over time, reducing fire performance after years of service. PPS is intrinsically flame retardant — the sulfur atoms in its polymer backbone act as a built-in flame quenching mechanism that never leaches, never depletes, and never loses effectiveness with age.
- UL 94 V-0 at thin sections. PPS achieves V-0 (self-extinguishing within 10 seconds, no flaming drips) at wall thicknesses as low as 0.8 mm — thinner than any duct application requires. PP with additives struggles to achieve V-2 at duct wall thicknesses (2.5-8 mm), and PVC releases HCl gas and dense smoke when burned. PPS offers the fire performance without the smoke toxicity.
- 200degC continuous service. PP softens at 80degC. PVC degrades at 60degC. PPS maintains mechanical integrity at 200degC continuously — making it the material of choice for semiconductor process exhaust, chemical reactor vents, oven exhaust, and other high-temperature industrial applications. This supports compliance with US EPA NESHAP requirements for high-temperature chemical exhaust conveyance.
Why Xicheng
16 years, 2600+ systems shipped worldwide. PPS is a higher-cost engineering polymer — specifying and fabricating it requires experience. Used correctly, it solves fire and temperature problems that PP and PVC cannot. Specified incorrectly, it adds cost without adding value:
- PPS injection molding expertise. PPS requires higher melt temperatures (290-330degC vs PP’s 180-240degC) and more precise mold temperature control. Our injection molding equipment and process parameters are set up specifically for PPS — not adapted from PP production. This ensures consistent material properties and dimensional accuracy.
- Where PPS is essential, not just optional. Semiconductor fabs (process exhaust at 120-180degC), chemical plants (reactor vent lines, hot solvent exhaust), pharmaceutical manufacturing (sterilization exhaust, autoclave vents), tunnel and underground ventilation (fire-life-safety ductwork), battery manufacturing (electrolyte drying exhaust), and heat treatment facilities (furnace exhaust). In these applications, PP and PVC fail. PPS is the only plastic duct option.
- Fabrication capability for large-diameter PPS. PPS sheet is more challenging to weld than PP or PVC — the narrow processing window requires precise temperature control during hot-gas extrusion welding. Our technicians are qualified on PPS welding procedures, producing full-penetration welds with mechanical properties approaching the parent material.
- When PPS is overkill, we’ll tell you. PPS costs 3-5x more than PP. If your application only needs flame retardancy at moderate temperatures (below 80degC), PP with flame retardant additives may be the more cost-effective choice. We’ll recommend based on your actual temperature, fire rating, and chemical exposure requirements — not upsell you to PPS when it isn’t needed.
Send your fire rating and temperature requirements to xicheng023@outlook.com. We’ll confirm whether PPS is the right material and provide a complete proposal.
Core Advantages
- Inherent V-0 Flame Retardancy: PPS self-extinguishes within 10 seconds with no flaming drips — UL 94 V-0 rating from the polymer itself, not from additives that deplete over time.
- 200degC Continuous Temperature Rating: Handles high-temperature exhaust that softens PP (80degC max) and degrades PVC (60degC max) — semiconductor, chemical, and autoclave exhaust applications.
- Zero Smoke Toxicity vs PVC: PVC releases HCl gas and dense black smoke when burned — toxic to occupants and corrosive to equipment. PPS produces minimal smoke with no halogen acid gases.
- Chemical Resistance at Elevated Temperature: Maintains corrosion resistance to acids, alkalis, and solvents at temperatures where PP and PVC lose chemical compatibility.
- Injection Molded + Fabricated to Full Range: 15-1,000 mm injection molded seamless; larger sizes PPS sheet fabricated with qualified welding procedures.
Key Specifications
| Material | PPS (Polyphenylene Sulfide) — inherently flame retardant polymer |
| Flame Rating | UL 94 V-0; Limiting Oxygen Index (LOI) 44% |
| Manufacturing Process | Injection molding (15-1,000 mm); sheet fabrication with PPS-qualified welding |
| Diameter Range | 15 mm – 1,000 mm (injection molded); larger sizes fabricated |
| Wall Thickness | 2.5 – 8 mm |
| Continuous Temperature | -20degC to 200degC (short-term 260degC) |
| Smoke Toxicity | No halogen acid gas emission; low smoke density |
| Service Life | 15+ Years |
| Brand / Origin | Xicheng / China |
Certifications and Compliance
- CE Certified – PPS Pipe, Duct, Fittings
- RoHS Compliant – PPS material
- ISO 9001 – Quality Management System
- ISO 14001 – Environmental Management System
- SGS Tested – PPS flame retardancy (UL 94 V-0), thermal stability, mechanical properties
- Design Compliance – Systems designed to meet US EPA NESHAP for chemical process exhaust and EU Industrial Emissions Directive (2010/75/EU) for fire-rated industrial ductwork
How to Order
- You send – Operating temperature, required fire rating (building code reference), diameter, airflow, chemical exposure
- We evaluate – Whether PPS is required or PP/PVC with flame retardant additives is sufficient for your conditions
- We specify – PPS pipe dimensions, wall thickness, connection method, support spacing for high-temperature service
- You approve – Technical proposal with material certs, flame rating documentation, and pricing
- We produce – 15-25 days. PPS injection molded or fabricated to specification with thermal expansion compensation design
Contact xicheng023@outlook.com or WhatsApp +86 18927456906 — quotation within 24 hours.
Complete Your System
- PP Industrial Pipe – Standard PP pipe for non-fire-rated applications
- PP Round Duct – Round duct for general ventilation
- PPS Flame Retardant Pipe – Full PPS duct system for fire-rated applications
FAQ
When is PPS required instead of flame-retardant PP?
PPS is required when: operating temperature exceeds 80degC (PP’s continuous limit), building codes require inherently non-flammable material (not additive-dependent flame retardancy), or the application involves both high temperature AND corrosive chemicals simultaneously. PP with flame retardant additives is suitable for ambient-temperature applications requiring basic flame rating. We evaluate your specific conditions before recommending PPS — it costs more and should only be specified when genuinely needed.
Does PPS release toxic smoke when burned?
No — this is a key advantage over PVC. PPS contains no halogens (chlorine, fluorine, bromine) in its polymer structure, so combustion produces no HCl, HF, or HBr gases. Smoke density is low and toxicity is minimal compared to PVC (which releases dense HCl-laden smoke) and brominated flame-retardant PP (which releases bromine compounds). For tunnel, underground, and occupied-building ventilation, this smoke toxicity difference is critical for life safety.
Can PPS pipe be connected to PP or PVC duct sections?
Not by welding — PPS, PP, and PVC are different polymers with incompatible melt temperatures and cannot be fusion-welded to each other. For transitions between PPS and PP/PVC sections, we provide flanged connections with chemically compatible gaskets. The PPS section handles the high-temperature zone nearest the source; the PP or PVC section continues the run once the exhaust has cooled below 80degC. We design the transition point based on your temperature profile.
