Common traps of inferior brass fittings
Material adulteration
Problems: using impure copper (recycling copper and zinc waste), adding excessive lead/iron/tin to reduce costs, or mixing in cheap metals (such as copper-plated cast steel).
Risks: Insufficient strength and easy to burst, poor corrosion resistance (accelerated dezincification), lead leaching and contamination of drinking water (violating NSF 61 standards).
Insufficient wall thickness
Problems: Secretly reducing the thickness of the pipe wall (especially the pressure-bearing parts such as the root of the thread).
Risks: Reduced pressure bearing capacity, easy to crack and leak under pressure/vibration.
Process defects
Uncleaned burrs, sand holes and air holes, poor thread accuracy (not matching standard NPT/BSP), weak electroplating adhesion.
Risks: Difficult installation, seal failure, plating peeling and accelerated corrosion.
Practical identification method
| Inspection points | Product characteristics | Poor quality product characteristics |
|
Surface finish |
Uniform and fine, without bumps, cracks, sand holes | Roughness, burrs, obvious pores or cold insulation lines |
| Electroplating/polishing layer | Dense and bright coating, no blistering/flaking | Mottled, dark, partial plating missing, or easy to scratch |
| Corners and edges | Smooth transition, no sharp edges | Sharp edges can easily cut the sealing material |
| Logo and certification | Clearly engraved brand, specification, standard number (such as ASTM B16), NSF/WRAS certification code | No logo, blurred logo or forged certification |
