Corrosion Resistance Chart for Pressure Gauge with “Plastic Material Connector”

SJ Gauge
2025-02-21
Knowledge

SJ Gauge: Pressure gauges or diaphragm pressure gauges, due to their measurement principles, have connectors that come into contact with the pressure source (medium). For fluids with corrosive properties, we often choose pressure gauges with plastic connectors or diaphragms. The following is a list of common plastic materials used in pressure gauges and their corrosion resistance to different pressure sources (information is for reference only, and actual conditions may vary; rely on on-site experience for accurate assessment):

Corrosion Resistance Table for Common Pressure Gauge Plastic Materials Symbol Explanation: ✓: Highly resistant, ○: Suitable X: Not recommended ⊗: Partially suitable (e.g., at high concentrations or in the presence of moisture).
Category	Name	Formula	PP	PVC	PVDF	PTFE	PFA
	Water	H₂O	✓	✓	✓	✓	✓
	Hydrogen	H₂	✓	✓	✓	✓	✓
	Nitric Oxide	N₂O	✓	✓	✓	✓	✓
	Hydrogen Peroxide	H₂O₂	○	✓	○	✓	✓
Acid	Hydrochloric Acid	HCl	✓	✓	✓	✓	✓
	Nitric Acid	HNO₃	○	✓	✓	✓	✓
	Sulfuric Acid	H₂SO₄	○	✓	✓	✓	✓
	Hydrogen Sulfide	H₂S	✓	✓	✓	✓	✓
	Carbonate	H₂CO₃	✓	✓	✓	✓	✓
	Phosphoric Acid	H₃PO₄	✓	✓	✓	✓	✓
	Chromic Acid	H₂CrO₄	○	✓	○	✓	✓
	Hydrofluoric Acid	HF	○	○	✓	✓	✓
	Chloric Acid	HClO₃	○	✓	✓	✓	✓
	Sulfur Dioxide	SO₂	✓	✓	✓	✓	✓
Alkali	Sodium Hydroxide	NaOH	✓	✓	✓	✓	✓
Alkali	Ammonia	NH₃	–	–	–	✓	✓
Salt	Ammonium Nitrate	NH₄NO₃	✓	–	✓	✓	✓
	Ammonium Sulfate	(NH₄)₂SO₄	✓	✓	✓	✓	✓
	Aluminum Sulfate	Al₂ (SO₄)₃	✓	✓	✓	✓	✓
	Copper Sulfate	CuSO₄	✓	✓	✓	✓	✓
	Ammonium Bicarbonate	NH₄HCO₃	✓	✓	✓	✓	✓
	Sodium Carbonate	Na₂CO₃	✓	✓	✓	✓	✓
	Sodium Bicarbonate	NaHCO₃	○	✓	✓	✓	✓
	Ammonium Chloride	NH₄Cl	✓	✓	✓	✓	✓
	Potassium Chloride	KCl	✓	✓	✓	✓	✓
	Iron(III) Chloride	FeCl₃	✓	✓	✓	✓	✓
	Sodium Hypochlorite	NaOCl	○	✓	✓	✓	✓
Aqueous		Mineral water	✓	✓	✓	✓	✓
		Sewage	✓	✓	✓	✓	✓
		Brines	✓	✓	✓	✓	✓
		30% NaCl	✓	✓	✓	✓	✓
		Beer	✓	✓	✓	✓	✓
		Juice	✓	✓	✓	✓	✓
Toxicity	Sulfur	Sulfur	–	–	–	✓	✓
	Chlorine Gas	Cl₂	✓	✓	✓	✓	✓
	Chlorine Water	Chlorinated Water	✓	✓	✓	✓	✓
	Bromine Gas	Br₂	X	X	⊗	✓	✓
	Phosgene	COCl₂	✓	✓	✓	✓	✓
Organic	Organic Acetic Acid	CH₃COOH	✓	✓	✓	✓	✓
	Ammonium Acetate	CH₃COONH₄	✓	–	–	✓	✓
	Glycerol	Glycerol	✓	✓	✓	✓	✓
	Xylene	C₈H₁₀	X	X	○	✓	✓
	Methanol	CH₃OH	○	✓	✓	✓	✓
	Ethanol	C₂H₅OH	○	✓	✓	✓	✓
	Methane	CH4	✓	✓	✓	✓	✓
	Dichloroethylene	C₂H₂Cl₂	X	X	✓	✓	✓
	Chloroform	CHCl₃	X	X	✓	✓	✓
	Vinyl Chloride	C₂H₃Cl	X	X	✓	✓	✓
	Cellulose Acetate	cellulose acetate	–	–	–	✓	✓
	Citric Acid	C₆H₈O₇	○	⊗	✓	✓	✓
	Crude Oil	Crude	✓	✓	✓	✓	✓
	Freon	Freon	✓	✓	✓	✓	✓