High-Temperature Gas Filtration — Material Selection and System Design Above 150 °C
Above 150 °C, standard aluminium housings, Buna-N seals, and adhesive-bonded elements start to fail. High-temperature gas filtration demands careful material selection across every component.
Recognise the Symptoms
- Seal failure or leakage at operating temperature
- Element media degradation — softening, delamination, or discolouration after thermal exposure
- Housing discolouration or surface oxidation
- Loss of filtration efficiency at temperature
- Adhesive bond failure on element end-caps
- Reduced element service life in heated applications
Root Causes
Aluminium housing used above its rated temperature
aluminium alloys lose structural strength above 150–200 °C and may not meet pressure vessel requirements at elevated temperatures
Standard elastomer seals
Buna-N (NBR) seals degrade above 100 °C, Viton (FKM) above 200 °C. Incorrect seal material causes leakage and bypass
Element adhesive limits
standard epoxy adhesives bonding the filter media to end-caps typically fail between 120–180 °C. High-temperature elements require specialist adhesive systems or mechanical sealing
Thermal shock
rapid temperature changes cause differential expansion between housing, element, and seals, leading to leakage or mechanical damage
Diagnostic Checklist
- 1What is the continuous operating temperature? What are the maximum transient temperatures?
- 2What is the operating pressure at temperature?
- 3What housing material is currently installed? (Aluminium, carbon steel, stainless steel)
- 4What seal material is fitted? (NBR, FKM, PTFE, Graphite)
- 5What is the element temperature rating?
- 6Are there thermal cycles or rapid temperature changes?
- 7Is the gas dry or does it contain condensable components at temperature?
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