Name: China Brass TH-U Crimp Press Fittings Manifold Manufacturers Suppliers Factory
Brand: Dunyun
SKU: 290572767

HPb59-1 VS. CW617N

The closest equivalent grade of HPb59-1 in European standards is CW617N (CuZn39Pb2), also often referred to as CuZn39Pb1, which complies with the EN 12164 standard. Below is a detailed breakdown:

Chemical Composition Comparison:

Composition	China GB/T 5231 HPb59-1	Europe EN CW617N (CuZn39Pb2)
Cu	57.0-60.0%	57.0-59.0%
Pb	0.8-1.9%	1.5-2.5%
Zn	Remainder	Remainder
Impurities	Fe≤0.5%, Sn≤0.3%, Others≤0.5%	Fe≤0.5%, Sn≤0.2%, Ni+Co≤0.5%

Key Notes:

1. Main Differences:

The lead content range of CW617N (1.5-2.5%) is slightly higher than the lower limit of HPb59-1 (0.8%). The minimum copper content of the two grades is the same, but the maximum copper content of CW617N is slightly lower (59.0% vs 60.0%).

2. Alternative Grade Reference:

If a European grade with lead content closer to HPb59-1 is required, CW612N (CuZn39Pb3) can be considered. However, its lead content is higher (1.8-2.5%), making it more suitable for scenarios with higher requirements for machinability.

3. Application Compatibility:

Both grades are free-cutting leaded brasses, applicable to products requiring good machining performance such as plumbing valves, pipe fittings, and hardware. In actual procurement and production, the selection can be made according to specific composition requirements.

Precautions for Using Crimp Press Fittings

Crimp Press fittings of aluminum-plastic pipes are core accessories for connecting aluminum-plastic composite pipes. Their installation quality directly affects the tightness and service life of the piping system. Especially in heating, ventilation, air conditioning (HVAC), water supply and drainage, and floor heating systems, the following precautions must be strictly followed:

Precautions for Pre-construction Preparation

1. Matching of Fittings and Pipes

The specifications and models of crimp fittings must be fully matched with the diameter and material of aluminum-plastic pipes (e.g., PEX-AL-PEX aluminum-plastic pipes shall be equipped with dedicated crimp fittings; crimp fittings for PPR or pure plastic pipes are not allowed to be mixed).

Inspect the appearance of crimp fittings: ensure there are no cracks, deformations or corrosion on the surface; the sealing ring (usually made of EPDM) shall be intact without damage or aging, and be properly installed without falling off or displacement.secure connection pex press fittings

2. Pipe Pre-treatment

When cutting aluminum-plastic pipes, use a special pipe cutter to ensure the cut is flat, perpendicular and burr-free. Cutting with a hacksaw is strictly prohibited (to prevent aluminum chips from entering the pipe or scratching the sealing ring).

Remove burrs on the aluminum layer and plastic flashes at the cut to avoid piercing the sealing ring during crimping and causing water leakage.

Wipe the outer wall of the pipe insertion end and the inner wall of the crimp fitting with a clean dry cloth to remove oil stains, dust, water stains and other impurities, so as not to affect the sealing effect.PEX Brass Press Female Elbow

Operational Precautions During Installation

1. Control of Pipe Insertion Depth

Insert the aluminum-plastic pipe completely to the bottom of the crimp fitting to ensure the outer wall of the pipe fits the inner wall of the fitting, and align with the insertion depth marking line on the fitting.

Insufficient insertion depth will lead to inadequate crimping area and insufficient connection strength; excessive insertion depth may squeeze the sealing ring and cause sealing failure.PEX Brass Press Male Thread Elbow

2. Standard Use of Crimping Tools

Select a special crimping pliers or hydraulic crimping tool that matches the specifications of the crimp fitting. Do not use ordinary wrenches or vice grips for forced compression.PEX Press Fitting Brass Socket

During crimping, align the jaw of the crimping tool with the crimping zone of the fitting (usually designed with a groove), ensure the jaw is perpendicular to the axis of the crimp fitting, apply force evenly until the tool reaches the preset pressure and releases pressure automatically (for hydraulic tools).PEX Press Seated Elbow

Achieve crimping in one operation. Repeated crimping is strictly prohibited (repeated crimping will cause deformation and metal fatigue of the fitting, which will instead reduce the sealing performance). PEX Press Fitting 20 32mm Tee

3. Avoid Pipe Distortion and Deformation

Keep the pipe coaxial with the crimp fitting during pipe insertion and crimping operations. Do not forcibly bend or twist the pipe to prevent stress concentration at the pipe joint after crimping, which may cause cracking during long-term use. PEX Press Fitting Brass Socket