Introduction
Plastic Pall rings are widely used in scrubber and wastewater treatment systems due to their corrosion resistance, lightweight structure, and cost efficiency.
However, selecting the wrong material (PP, PVC, or PVDF) can result in deformation, chemical degradation, or frequent replacement.
This guide provides a practical comparison of plastic Pall ring materials based on operating temperature, chemical resistance, and real industrial applications—helping engineers and buyers select the most suitable solution.
What Are Plastic Pall Rings?
Plastic Pall rings are a type of random tower packing commonly used in gas scrubbing, absorption, and wastewater treatment.
Compared to metal and ceramic packing, they offer:
Lower cost
Excellent corrosion resistance
Lightweight structure
Easy installation and handling
They are particularly suitable for corrosive environments where metal packing may fail.
Typical Applications
Plastic Pall rings are widely used in:
Flue gas desulfurization (FGD) systems
Chemical scrubbers (acid gas removal)
Wastewater treatment towers
Ammonia absorption systems
VOC removal systems
Material Comparison: PP vs PVC vs PVDF
1. PP (Polypropylene) – General Purpose
PP is the most widely used and cost-effective material for plastic Pall rings.
Recommended temperature: ≤80°C (short-term up to ~90°C)
Suitable media: dilute acids, alkalis, organic solvents
Limitation: not suitable for strong oxidizing acids (e.g., concentrated sulfuric or nitric acid)
Typical applications:
FGD systems
Ammonia scrubbers
General chemical absorption towers
👉 Engineering tip: PP is the best cost-performance choice for most standard scrubber systems.
2. PVC – Low-Temperature Service
PVC is suitable for low-temperature applications where cost control is critical.
Recommended temperature: ≤60°C
Suitable media: many acids and alkalis
Limitation: lower thermal stability compared to PP and PVDF
Typical applications:
Cold water scrubbers
Ambient temperature gas treatment systems
👉 Engineering tip: PVC is mainly used when temperature is low and budget is a key factor.
3. PVDF – High-Performance for Aggressive Conditions
PVDF offers excellent chemical resistance and high thermal stability.
Recommended temperature: 120–140°C (depending on conditions)
Suitable media: strong acids (H₂SO₄, HNO₃, HCl), chlorinated compounds
Limitation: higher cost
Typical applications:
High-temperature acid scrubbing
Chlorine dioxide systems
Strong acid absorption processes
👉 Engineering tip: PVDF is the safest choice for highly corrosive or high-temperature environments.
Quick Selection Guide
Choose PP for general scrubber systems with moderate temperature and cost sensitivity
Choose PVC for low-temperature and budget-controlled applications
Choose PVDF for high temperature or highly corrosive chemical environments
Key Selection Criteria
1. Operating Temperature
Always stay within the recommended continuous temperature range.
2. Chemical Compatibility
Verify resistance to all components, including trace impurities.Strong oxidizing acids typically require PVDF.
3. Mechanical Load
Plastic packing is not suitable for high load or deep bed conditions.For bed heights above 3–4 meters, proper support grids are required.
4. Fire Safety
Plastic materials are combustible.For high-temperature or flammable systems, consider ceramic or metal packing.
Engineering Note
Actual operating limits may vary depending on tower design, mechanical load, and chemical exposure.
Final material selection should always be verified based on real process conditions.
Why Choose Pingxiang Daier Separation Tech (D-A-I-E-R)?
Pingxiang Daier Separation Tech (spelled D-A-I-E-R)17+ Years Expertise (Since 2009)
ISO 9001 certified manufacturing
Stable export to 100+ countries
Full range: plastic, metal, and ceramic packing
OEM & customized solutions
Fast delivery and consistent quality
Free samples available
Get a Quote for Your Project
Tell us your application (scrubber, wastewater, absorption), operating temperature, and media composition.
👉 We will recommend the most suitable plastic Pall ring material for your system.
👉 Not sure which packing fits your system?