Introduction
The body material of pneumatic fittings directly affects their strength, corrosion resistance, applicable environment, and cost. Brass, stainless steel, and engineering plastics are the three major mainstream choices, each with its distinct application boundaries.
In-depth comparison of three major materials
| feature dimension | brass fitting | stainless steel connector | Engineering plastic connector |
|---|---|---|---|
| mechanical strength | good | ★★★★★ Extremely high | Medium (dependent on brand) |
| corrosion resistance | General. Not resistant to ammonia, seawater, and certain acidic media. Can be improved by nickel plating on the surface. | ★★★★★ Excellent. Especially 316 stainless steel, which is resistant to various chemicals. | "Good. Resistant to various acids, alkalis, and salts, but may be soluble in organic solvents.". |
| Operating Temperature | -20°C ~ 150°C | -60°C ~ 200°C | -40°C ~ 80°C (PP)；-20°C ~ 100°C (PBT) |
| weight | heavy | heavy | ★★★★★ Extremely light |
| conductivity | Good conductor | Good conductor | insulator |
| cost | Economical, with high cost-effectiveness | expensive | low |
| Typical Applications | General industrial environment: predominantly dry air, low corrosivity environment. | Harsh environment: food/pharmaceutical (easy to clean), chemical, marine, outdoor, high humidity, high cleanliness requirements. | Light load/special media: water treatment, low-pressure pneumatics, corrosive chemical transportation, and insulation-required applications. |
Selection decision tree
Is the environment highly corrosive (acid, alkali, salt, seawater) or has high cleanliness requirements?
The preferred choice is stainless steel fittings (especially 316L).
No → Proceed to the next step.
Is the system extremely sensitive to weight, insulation, or cost?
Yes, and it is for low pressure/light load → consider engineering plastic connectors (compatibility with the medium needs to be confirmed).
No → proceed to the next step.
In a general industrial environment, is there a pursuit of a balance between reliability and cost-effectiveness?
Brass fittings are the optimal choice. For use in humid environments, surface nickel-plated brass fittings are an option.
Special reminder
In the food and beverage and pharmaceutical industries, stainless steel connectors are commonly used, even when the medium is non-corrosive, due to their smooth surface, rust-free nature, and ease of cleaning and disinfection, which meet hygiene standards.
When using plastic connectors, it is essential to verify their pressure rating and temperature range, and confirm their chemical compatibility with the working medium.
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