Triangle-Shaped PP Plastic Welding Rod

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Product details

Triangle-Shaped PP Plastic Welding Rod

PP Welding Rod is a thermoplastic plastic rod based on polypropylene (PP) resin, designed for plastic welding processes (such as hot air welding, extrusion welding). Polypropylene is a semi-crystalline thermoplastic formed by the polymerization of propylene monomers. The molecular chain contains methyl side groups, which give it high rigidity, low density and excellent chemical corrosion resistance. The raw material of PP welding rods is usually homopolymer polypropylene (Homopolymer PP) or copolymer polypropylene (Copolymer PP). It is formed into rods with uniform diameters through extrusion. The diameter range is commonly 2.0mm to 6.0mm, and the length can be customized according to demand. According to different uses, PP welding rods can be divided into ordinary grade, high flow grade, reinforced grade (adding glass fiber) and food grade. Some products are improved by adding UV stabilizers to improve weather resistance and are suitable for long-term outdoor exposure environments.

PP Welding Rod has demonstrated irreplaceable advantages in the fields of chemical tank repair, water treatment pipeline maintenance, plastic product manufacturing and food equipment welding, and has become one of the core materials for economical and efficient repair and manufacturing of polypropylene-based components.

Product performance

Mechanical properties:

High rigidity: tensile strength 25-40MPa, flexural modulus 800-1400MPa, better than polyethylene (PE) but slightly lower than polyamide (PA), suitable for structural welding needs with medium static loads.

Medium toughness: cantilever beam notch impact strength ≥5kJ/m² (normal temperature), impact performance significantly reduced at low temperature (-20℃) (brittle temperature about -15℃ to -20℃), direct exposure after welding in extremely low temperature environment should be avoided.

High hardness: Rockwell hardness (R-scale) is about 90-100, surface wear resistance is better than polyethylene, but long-term friction may cause slight scratches.

pp rod welding

Thermal properties:

Melting point is about 160-170℃, heat deformation temperature (under 1.82MPa load) is about 80-100℃, long-term use temperature range is -20℃ to 110℃ (short-term tolerance of 120℃).

Low temperature resistance is general, and toughness is significantly reduced below -20℃. The risk of brittleness of welded parts in cold environments needs to be considered.

Chemical properties:

Excellent chemical corrosion resistance: Stable to most acids (such as sulfuric acid, hydrochloric acid, phosphoric acid), alkalis (such as sodium hydroxide, potassium hydroxide), salt solutions and organic solvents (such as ethanol, acetone), only soluble in strong oxidants (such as concentrated nitric acid, fuming sulfuric acid) and high-temperature halogenated hydrocarbons (such as carbon tetrachloride).

Excellent water resistance and steam resistance, long-term use in humid environments has almost no attenuation, and the permeability is much lower than PVC (polyvinyl chloride) and ABS (acrylonitrile-butadiene-styrene copolymer).

Electrical properties:

Volume resistivity ≥10¹⁵Ω·cm, dielectric strength 20-30kV/mm, it is an excellent insulating material, suitable for welding repair of low-voltage electrical components.

Processing performance:

It has moderate melt fluidity (melt flow rate MFR is about 1-10g/10min), and is easy to be hot-air welded (temperature 200-260℃), extrusion welded or ultrasonic welded; the joint strength after welding can reach 80%-95% of the parent material.

It has extremely low water absorption (<0.03%), no drying treatment is required before welding, and high dimensional stability after processing.

Other characteristics:

It has low density (0.90-0.91g/cm³), which is only 1/8 of steel and 1/3 of aluminum, and is suitable for welding repair of lightweight parts.

It is non-toxic and meets food contact safety standards (such as FDA, EU 10/2011), and can be used for welding of food processing equipment or medical devices.

pp rods welding

Product Advantages

Material compatibility: The melting temperature and chemical structure of PP welding rods and polypropylene substrates are highly matched, and the welding seam strength is high, which can ensure that the performance of the repaired parts is consistent with that of the parent material.
Economic and environmental protection: The cost of welding repair is only 1/3-1/2 of that of replacing new parts, and the waste can be 100% recycled and reused, which is in line with the concept of circular economy.
Process flexibility: Supports a variety of welding methods (hot air welding, extrusion welding, ultrasonic welding), adapting to the repair needs of complex shapes or narrow spaces; welding equipment is portable (such as hot air welding guns), suitable for on-site operations.
Comprehensive chemical and temperature resistance: In chemical storage tanks, pipelines and other scenarios, it can withstand corrosive media and medium temperatures, extending the service life of the equipment.

Scope of application

The core value of PP Welding Rod lies in its comprehensive characteristics of "material matching-chemical corrosion resistance-economic repair". It is suitable for welding, repairing and manufacturing of all plastic parts based on polypropylene, especially in chemical equipment, environmental protection engineering, water treatment systems and plastic product processing industries. Its typical application scenarios include:

Plastic pipe and tank repair: used for welding repair of cracks, sand holes or interfaces of PP pipes, or repair of damaged tank linings.
Plastic product manufacturing: as an auxiliary material for injection molding, used for insert welding of complex structural parts or lamination and bonding of multi-layer plates.
Industrial equipment maintenance: on-site welding repair of PP parts such as chemical reactors, ventilation ducts, and filtration devices.