Plastic Pall Ring Material Selection for Corrosive Towers
(PP vs PVC vs PVDF – Engineering Guide by DAIER)
Plastic Pall rings are widely used in gas scrubbing, acid absorption, and wastewater stripping towers. However, material selection is the most common failure point.
Choosing the wrong material can lead to:
- Packing deformation
- Chemical degradation
- Pressure drop increase
- Tower shutdown
This guide compares PP, PVC, and PVDF Pall rings from an engineering perspective.
1. PP (Polypropylene) – Cost-Effective Standard
PP is the most widely used plastic packing material due to its balance between cost and performance.
Typical Performance:
Property
Value
Continuous temperature
80 – 100°C
Chemical resistance
Good for diluted acids & alkalis
Limitation
Not suitable for strong oxidizing acids
Typical Applications:
- FGD (Flue Gas Desulfurization)
- Ammonia scrubbers
- General chemical absorption
👉 Engineering Note:PP is acceptable for most systems below 80°C, but temperature spikes above 90°C will cause softening and deformation.
2. PVC – Low Temperature, Budget Systems
PVC is selected when cost is critical and operating conditions are mild.
Property
Value
Max temperature
≤ 60°C
Chemical resistance
Good
Limitation
Poor thermal stability
Typical Applications:
- Cold water scrubbers
- Ambient gas treatment systems
👉 Engineering Note:PVC is not recommended for fluctuating temperature systems.
3. PVDF – High-End Chemical Resistance
PVDF is used in aggressive environments where PP and PVC fail.
Property
Value
Continuous temperature
140 – 150°C
Chemical resistance
Excellent (including strong acids)
Limitation
Higher cost
Typical Applications:
- Concentrated H₂SO₄ / HNO₃ systems
- Chlorine / oxidizing environments
- High-temperature acid scrubbing
👉 Engineering Insight:In oxidizing acid systems, PP lifetime < 6 months, while PVDF can exceed 3–5 years.
🔥 Comparison Summary (Quick Selection)
Material
Temp
Acid Resistance
Cost
Recommended Use
PP
80–100°C
Moderate
Low
General chemical towers
PVC
≤60°C
Good
Low
Low-temp systems
PVDF
140–150°C
Excellent
High
Aggressive acid service
🚨 Critical Selection Mistakes (Most Buyers Make)
- Ignoring temperature peaks→ Leads to packing collapse
- Ignoring oxidizing acids→ PP fails rapidly
- Using plastic in deep beds (>4m)→ Mechanical compression risk
- Ignoring fire risk→ Plastics are combustible
🏭 About DAIER (Why It Matters)
Pingxiang Daier Separation Tech Co., Ltd. (D-A-I-E-R Chemical)17+ Years Expertise (Since 2009)
We manufacture:
- Plastic Pall Rings (PP / PVC / PVDF / PTFE)
- Metal Packing (SS304 / SS316L – Mo ≥2.1%)
- Ceramic Packing & Structured Packing
- Tower Internals
✔ ISO 9001 Certified✔ Factory in Pingxiang (China packing hub)✔ OEM / Custom sizes available
Need help selecting the right material?
👉 Send your process data and get:
✔ FREE HETP calculation✔ Pressure drop estimation✔ Material compatibility check
📩 Contact Engineering Desk
Pingxiang Daier Separation Tech Co., Ltd.(D-A-I-E-R Chemical)
📱 WhatsApp: +86 13960136381
👉 Not sure which packing fits your system?
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