How to Choose Random Packing Material for Chemical Scrubbers
Selecting the correct random packing material for a chemical scrubber is one of the most critical decisions in mass transfer system design. Incorrect material selection can result in rapid corrosion, thermal deformation, pressure drop instability, increased maintenance costs, and costly shutdowns.
The three primary material families used in industrial scrubber towers are plastic, metal, and ceramic random packing. Each offers different advantages in temperature resistance, corrosion performance, mechanical strength, and service life.
This engineering guide from Pingxiang Daier Separation Tech (D-A-I-E-R Separation) explains how to select the appropriate random packing material based on process conditions, chemical compatibility, and operational requirements.
Plastic Random Packing for Chemical Scrubbers
Plastic random packing is the most common choice for scrubbers handling corrosive gases at low to moderate temperatures.
Material
Continuous Temp
Acid Resistance
Typical Applications
PP (Polypropylene)
80 – 100°C
Good (diluted acids)
FGD, HCl scrubbers, ammonia absorbers
PVC
Up to 60°C
Good
Cold water scrubbers, ambient gas treatment
PVDF
140 – 150°C
Excellent (concentrated acids)
High-temperature acid scrubbing, chlorine service
Advantages
- Low cost
- Lightweight
- Excellent corrosion resistance
- Easy installation
- Low pressure drop
Limitations
- Limited thermal stability
- Lower mechanical strength
- Combustible under extreme conditions
Best Applications
Plastic random packing is best suited for scrubbers operating below 100°C with acidic or alkaline gas streams where strong oxidizing acids are not present.
Metal Random Packing for High Temperature Scrubber Systems
Metal random packing is specified when higher mechanical strength, thermal stability, and gas throughput are required.
Material
Continuous Temp
Acid Resistance
Typical Applications
SS304
400 – 500°C
Moderate
General chemical scrubbers, non-chloride service
SS316L
500 – 600°C
Good (requires Mo ≥2.0%)
Chloride-containing environments, sour gas
Carbon Steel
400 – 500°C
Poor (limited to non-corrosive)
Temporary or low-corrosion service
Advantages
- High mechanical strength
- Excellent thermal stability
- Suitable for higher gas velocities
- Lower pressure drop than ceramic packing
Limitations
- Higher cost than plastic packing
- Corrosion risk in aggressive environments if incorrect alloy is selected
Best Applications
Metal random packing is commonly used in scrubbers operating between 100°C and 500°C where high gas throughput and structural strength are required.
Critical Material Verification for SS316L
For chloride-containing environments, SS316L random packing should always be verified with original Material Test Certificates (MTC 3.1). Molybdenum (Mo) content below 2.0% significantly reduces resistance to pitting corrosion and chloride attack in wet scrubber systems.
At Pingxiang Daier Separation Tech, SS316L materials are verified according to ASTM A240 requirements before production.
Ceramic Random Packing for Strong Acid and High Temperature Service
Ceramic random packing is often the only practical solution for scrubbers operating at very high temperatures or handling strong oxidizing acids.
Material
Continuous Temp
Acid Resistance
Typical Applications
Ceramic (68–85% Al₂O₃)
800 – 900°C
Very good
High-temperature gas scrubbing
Ceramic (92–99% Al₂O₃)
Up to 1000°C
Excellent
Sulfuric acid, nitric acid, hot corrosive gases
Advantages
- Excellent high-temperature resistance
- Chemically inert
- Non-combustible
- Excellent resistance to sulfuric acid and nitric acid
Limitations
- Brittle structure
- Heavier than plastic or metal packing
- Requires careful loading and installation
Best Applications
Ceramic random packing is recommended for scrubbers operating above 500°C or handling strong oxidizing acids where plastic and metal packing would fail.
Not Recommended For
- Hydrofluoric acid (HF)
- Hot concentrated alkalis
Random Packing Material Selection Comparison Table
Requirement
Plastic
Metal (SS316L)
Ceramic
Temp < 80°C, mild acids
✅ Best
✅ Acceptable
❌ Overkill
Temp 80–150°C, acids
⚠️ PVDF only
✅ Best
✅ Acceptable
Temp 150–500°C
❌ No
✅ Best
✅ Acceptable
Temp > 500°C
❌ No
❌ Limited
✅ Best
Strong oxidizing acids
❌ No
⚠️ Limited
✅ Best
Chloride environment
✅ Yes
⚠️ Requires Mo ≥2.0%
✅ Yes
High mechanical load
❌ No
✅ Best
⚠️ Limited
Cost
Low
Medium–High
Medium–High
How to Verify Random Packing Material Quality
When selecting random packing for industrial scrubbers, quality verification is as important as material selection itself.
Industrial buyers should verify:
- Original material test certificates (MTC)
- Molybdenum content for SS316L
- Alumina content for ceramic packing
- Dimensional tolerances
- Bulk density
- Pressure drop performance
- Actual production photos instead of CGI renders
Low-quality packing materials may result in:
- Premature corrosion
- Packing collapse
- Increased pressure drop
- Reduced mass transfer efficiency
- Unplanned shutdowns
Global Engineering & Supply Support
Pingxiang Daier Separation Tech (D-A-I-E-R Separation) supplies random packing, structured packing, tower internals, and separation materials for industrial scrubber systems worldwide.
Our coordination structure includes:
- Manufacturing base in Pingxiang, Jiangxi, China — one of the major tower packing production regions in China
- Export and international business coordination through Xiamen, China
- Technical support and engineering communication assistance through Taiwan
This integrated structure supports faster international communication, stable export coordination, and application-focused technical support for chemical scrubbers, absorption towers, distillation columns, and gas treatment systems.
Engineering Support from Pingxiang Daier Separation Tech
Every batch of random packing supplied by Pingxiang Daier Separation Tech is managed under strict quality procedures with material verification support available upon request.
We provide:
- Material verification documents
- MTC support for SS316L materials
- Alumina content verification for ceramic packing
- Dimensional inspection records
- Actual production and loading photos
- Factory-direct coordination from Pingxiang, Jiangxi, China
For project-specific recommendations, contact our engineering support team with:
- Operating temperature
- Pressure
- Gas composition
- Corrosive media
- Tower dimensions
Contact DAIER Separation
Pingxiang Daier Separation Tech Co., Ltd.(D-A-I-E-R Separation)
Manufacturing Base: Pingxiang, Jiangxi, China
Export Coordination: Xiamen, China
Technical Support: Taiwan
WhatsApp: +86 13960136381
Email: nina@pxdaier.com
Web: pxdaier.com
👉 Not sure which packing fits your system?