PE Welding Rod is a thermoplastic welding material based on polyethylene (PE) resin. It is formed into cylindrical rods through extrusion process and is specially used for welding, repairing or connecting polyethylene pipes, storage tanks, plates and other parts. Polyethylene is a polymer material formed by the polymerization of ethylene monomers. It has excellent corrosion resistance, flexibility and environmental stress cracking resistance. It can be divided into low-density polyethylene (LDPE), medium-density polyethylene (MDPE) and high-density polyethylene (HDPE) according to density differences. PE welding rods ensure high consistency with the physical and chemical properties of the substrate by matching the density, melt flow rate (MFR) and additive formula (such as UV inhibitors, carbon black masterbatch) of the substrate. It is widely used in the field of welding and repair of gas transmission pipelines, water supply and drainage systems, chemical storage tanks and plastic structural parts.
Product performance
Physical properties
Density: Matches with the substrate (LDPE: 0.910-0.925g/cm³; MDPE: 0.926-0.940g/cm³; HDPE: 0.941-0.965g/cm³), ensuring the bonding strength of the welding interface.
Melt flow rate (MFR): 1.0-10g/10min (190℃, 2.16kg), matches the processing fluidity of the substrate, ensuring uniform melting during the welding process.
Hardness: Shore D hardness 40-70 (HDPE welding rod has higher hardness, LDPE has lower hardness), taking into account flexibility and deformation resistance.
Mechanical properties
Tensile strength: ≥20MPa (HDPE welding rod can reach 30MPa), consistent with the tensile strength of the substrate (HDPE: 20-35MPa), ensuring the bearing capacity of the welding part.
Elongation at break: ≥400% (LDPE welding rod can reach 600%), retaining the high flexibility of polyethylene, adapting to the needs of pipeline expansion and contraction.
Impact strength: Cantilever beam notch impact strength ≥50kJ/m² (-20℃), excellent resistance to low temperature embrittlement, avoiding cracking of welding parts in cold environment.
Chemical properties
Corrosion resistance: Acid and alkali resistance (pH 1-14), salt spray resistance (>1000h no corrosion under ASTM B117 standard), suitable for chemical storage tanks and marine environment pipeline welding.
Solvent resistance: Good resistance to organic solvents such as mineral oil, gasoline, diesel, etc. (volume change rate <5%), avoiding chemical medium penetration and causing welding failure.
UV resistance: Add carbon black masterbatch (content ≥2%) or UV absorber (such as benzotriazole), outdoor exposure for 2000 hours without significant aging (yellowing index ΔYI <3).
Thermal properties
Melting temperature: 120-135℃ (LDPE), 125-138℃ (MDPE), 130-140℃ (HDPE), matching the melting point of the substrate to ensure full fusion of the welding interface.
Heat deformation temperature: 40-60℃ (LDPE), 50-70℃ (MDPE), 60-80℃ (HDPE), meeting the use requirements of normal temperature to medium temperature environment.
Low thermal conductivity: about 0.4-0.5W/m·K, reducing welding heat loss and improving welding efficiency.
Processing performance
Easy to melt: Rapidly melt at 120-140℃ (melting time <30 seconds), suitable for hot air welding, extrusion welding and other processes, reducing energy consumption.
Flowability: Moderate melt viscosity (viscosity 500-2000Pa·s at 190℃), ensuring that the molten material evenly fills the gap during welding to avoid pores or cold welding.
Welding compatibility: supports hot air welding (temperature 200-260℃), extrusion welding (temperature 180-240℃), electric fusion welding and other processes to meet the needs of different scenarios.
Product Advantages
- PE welding rods precisely match the density, MFR and additive formula of the base material to ensure that the physical and chemical properties of the welding interface are completely consistent with the base material, avoiding stress concentration or performance degradation caused by material differences. For example, in the welding of HDPE gas pipelines, the use of HDPE welding rods can make the tensile strength of the welding part reach more than 95% of the base material (ISO 4427 standard), significantly improving the long-term reliability of the pipeline system.
- PE welding rods have extremely high resistance to acids, alkalis, salts and organic solvents (volume change rate <5%), and perform outstandingly in welding chemical storage tanks (such as storage of sulfuric acid and hydrochloric acid) and offshore platform pipelines. For example, after long-term immersion in an acid solution of pH 3 (ASTM G31 standard), the tensile strength retention rate of the welded part is >98%, which is much better than ordinary plastic welding materials.
- PE welding rods have a fast melting speed (melting time <30 seconds at 120-140°C) and moderate fluidity, and support a variety of efficient processes such as hot air welding and extrusion welding. Taking hot air welding as an example, the single welding speed can reach 0.5-1.0m/min, which is 3-5 times the efficiency of electric fusion welding; extrusion welding is suitable for large-area repairs (such as tank leaks), and the single welding width can reach 20-30mm, significantly shortening the construction period. In addition, PE welding rods do not require preheating or special equipment, and can be operated with an ordinary welding gun, further reducing construction costs.
Scope of application
The core value of PE Welding Rod lies in its "material matching, anti-aging and high processing efficiency". It is suitable for welding repair and connection of all polyethylene pipes, storage tanks and plates, especially in the fields of gas transmission, water supply and drainage, chemical storage and transportation and agricultural irrigation.
