PPS Bag Filter (Ryton)
190 °C Continuous Operation, High Resistance to Acid Gases and Hydrolysis
The PPS bag filter (Ryton) is a needle-punched felt dust filter that operates continuously up to 190 °C with high resistance to acid gases and moisture; it is used for acidic and humid flue gases.
540 g/m²
190 °C
220 °C
285 °C
What Is a PPS (Ryton) Bag Filter?
PPS (polyphenylene sulphide) bag filters are a dust filtration medium made by the needle-punched felt method at 540 g/m² from a high-performance thermoplastic that offers natural chemical resistance to acid gases thanks to its sulphur-containing molecular structure. “Ryton” is the best-known brand name for this fibre type. Its durable, stable structure, which stands out for alkali and chemical resistance in high-temperature chemical environments, has made it the industry’s standard filtration medium for acid-laden flue gas environments.
PPS’s most important advantage is its resistance to moisture and dew point transitions. In high-humidity, SO₂-containing flue gas environments where polyester and acrylic hydrolyse and break down early, PPS keeps its dimensional stability and mechanical strength. Thermal power plants, waste incineration plants, chemical plants and coal-fired boilers are the most common applications.
Product Identity and Technical Summary
Key Technical and Structural Features
- Fibre Type
- PPS (Polyphenylene Sulphide / Ryton®) Needle-Punched Felt
- Weight
- 540 g/m²
- Continuous Operating Temperature
- 190 °C (under dry operating conditions)
- Peak (Surge) Temperature
- 220 °C (under dry operating conditions)
- Chemical Resistance
- Outstanding resistance to acids and alkalis; safe operation across a wide pH range.
- Hydrolysis Resistance
- High; stable performance in humid processes and through dew point transitions.
- Flame Resistance
- Self-extinguishing; LOI value of 34.
- Surface Treatment Options
- Sintering & Calendering
- PTFE Impregnation
- ePTFE Membrane Lamination
- Water and Oil Repellent Treatment
- Emission Performance
- ≤ 5 mg/Nm³ with ePTFE membrane
- Cleaning System Compatibility
- Pulse-Jet
- Reverse Air
- Shaker
PPS (Ryton) Bag Filter Surface Treatment Options
| Surface Finish | Property | Recommended Application |
|---|---|---|
| Singeing | Smooths the surface and improves dust release. | General high-temperature applications |
| Calendering | Smooths the surface and is compatible with pulse-jet cleaning systems. | Coal boilers and cement plants |
| Water and Oil Repellent | Helps protect the filter surface in processes involving moisture and sticky dust. | Chemical processes and wet flue gas applications |
| PTFE Coating | Provides additional chemical protection against acid condensation. | SO₂-intensive thermal power plant applications |
| ePTFE Membrane | Provides surface filtration and ≤ 5 mg/Nm³ emission performance. | Applications requiring strict emission limits |
| Antistatic | Helps dissipate static charges in a controlled way. | Applications involving combustible dust |
Advantages of the PPS (Ryton) Bag Filter
- Outstanding Acid and Alkali Resistance
- Strong chemical resistance across a wide pH range; stable performance in flue gas environments containing SO₂ and HCl.
- High Hydrolysis Resistance
- The fibre structure does not break down through moisture and dew point transitions; works reliably in wet environments where polyester and acrylic fall short.
- High Temperature Resistance
- Withstands 190 °C continuously and 220 °C peaks.
- Proven Weight Balance
- A weight of 540 g/m² balances high mechanical strength with suitable air permeability, giving stable long-term performance in chemical processes and similar industrial applications.
- Flame Resistance
- Its self-extinguishing structure (LOI 34) prevents flame spread.
- Low Emissions
- Emission values of ≤5 mg/Nm³ with an ePTFE membrane.
Industry Applications
Bag filters suited to different process needs are used across a wide range of industrial applications to protect product quality and production continuity.
01
Vegetable Oil
Clarity, purity and shelf life in vegetable oil and refining.
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02
Pipe and Profile
Cooling water filtration in pipe and profile extrusion.
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03
Paint Industry
Surface quality and pigment filtration in the paint industry.
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04
Glass Industry
Furnace and process filtration in the glass industry.
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05
Dialysis Centers
Water preparation and process filtration in dialysis centers.
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06
Foundry Industry
Equipment protection and dust filtration in foundries.
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07
Industrial Oil
Filtration in industrial oil production and recovery.
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08
Energy and Biogas
Maximum efficiency and turbine protection in energy and biogas.
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09
Recycling
Filtration for efficiency and environmental compliance in recycling.
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10
Food and Beverage
Hygienic filtration in food and beverage.
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11
Pharmaceuticals and Biotechnology
GMP-compliant sterile filtration in pharmaceuticals and biotechnology.
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12
Paper and Packaging
Process water filtration in paper and packaging.
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13
Chemical Industry
Corrosion-resistant, safe filtration in the chemical industry.
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14
Cosmetics
Microbiological safety and precision filtration in cosmetics.
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15
Machinery
Precision and technical filtration in the machinery industry.
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16
Printing and Ink
Flawless color and print quality in printing and ink.
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17
Metal and Surface Treatment
Flawless surfaces and bath stability in metal and surface treatment.
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18
Forest Products
Resin and glue filtration in forest products and furniture.
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19
Automotive
Precision process filtration for zero defects in automotive manufacturing.
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20
Oil and Petrochemicals
Equipment protection and process safety in oil and petrochemicals.
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21
Plastic Packaging
Precision process filtration and raw material purity in plastic packaging.
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22
Plastic Injection Molding
Cooling and hydraulic filtration in plastic injection molding.
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23
Water and Environment
Recovery filtration in water and environmental technologies.
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24
Shipyards and Marine
Operational safety and efficiency in shipyards and marine.
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Alternative media for the same application
PPS (Ryton) Bag Filter
Your Questions Answered
Frequently Asked Questions
At Prosestim, we are committed to answering your questions and providing technical support for our filtration solutions.
What is a PPS (Ryton) bag filter?
What is the difference between Nomex and PPS?
PPS offers wider chemical resistance and higher hydrolysis resistance, but its temperature limit (190 °C) is slightly lower than that of Nomex (204 °C). PPS is preferred in processes involving acids and moisture, and Nomex in dry applications where mechanical stress is the main concern.
What is the operating temperature limit?
Can it be used in humid environments?
Yes. PPS’s high hydrolysis resistance keeps its performance through moisture and dew point transitions; this is the key property that makes PPS clearly superior to polyester and acrylic.
Do you manufacture custom sizes?
Yes, custom production is available in non-standard diameter, length and surface treatment combinations.
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