Product Introduction
The PPR 45° equal-diameter elbow is a key connector for piping systems, made of Polypropylene Random Copolymer (PP-R). It features corrosion resistance, high-temperature resistance, pressure resistance, and hygienic safety. The following is a detailed introduction from aspects of product characteristics, application scenarios, technical parameters, installation methods, industry standards, and brand selection:
Core Characteristics
Material Advantages
Made of high-quality PP-R raw materials, it has the following properties:
High-Temperature Resistance: Long-term operating temperature up to 70℃, with instantaneous temperature resistance of 95℃. Some high-end products (such as Honeywell nano antibacterial pipes) can withstand instantaneous temperatures up to 110℃.
High-Pressure Resistance: Nominal pressure ranges from 1.6 to 2.5MPa, and the bursting pressure is more than 3 times the nominal pressure. For example, the bursting pressure of Rifeng S3.2 series elbows reaches 4.7MPa.
Corrosion Resistance: Strong tolerance to acid and alkali environments, suitable for chemical fluid transportation.
Hygienic Safety: Complies with GB/T 17219 hygiene standards, with no heavy metal precipitation. The smooth inner wall is not easy to scale, making it directly applicable to drinking water systems. Some brands (such as Jiumu and Honeywell) adopt silver ion antibacterial technology, with an antibacterial rate of up to 99%, effectively inhibiting bacterial growth.
Structural Design
45° Direction Change: Suitable for small-angle turns of pipelines, reducing space occupation and lowering water flow resistance.
Equal-Diameter Connection: Consistent inlet and outlet diameters (e.g., DN20, DN25, DN32, etc.) ensure smooth water flow without diameter reduction.
Light-Shielding Design: Some products adopt a light-shielding outer layer to prevent algae growth caused by light.
Application Scenarios
Civil Buildings
Domestic cold and hot water supply systems, especially suitable for pipeline turns in narrow spaces such as bathrooms and kitchens.
Floor heating coil systems, cooperating with manifolds to achieve uniform heat dissipation.
Pure water pipelines and direct drinking water systems, meeting hygiene requirements.
Industrial Fields
Chemical fluid transportation (chemical-resistant products should be selected).
Compressed air pipelines and ship water supply and drainage systems, adapting to complex environments.
Medical and Special Scenarios
Medical gas pipelines, which need to pass hygienic certification.
Antibacterial elbows (such as products from Honeywell and Jiumu) are suitable for places with high water quality requirements such as hospitals and laboratories.
Technical Parameters
Specifications and Models
Nominal Outer Diameter (DN): 20mm (1/2 inch), 25mm (3/4 inch), 32mm (1 inch), etc., matching mainstream water pipe diameters.
Pressure Class: PN1.6MPa, PN2.0MPa, PN2.5MPa, corresponding to different usage environments.
Physical Properties
Vicat Softening Temperature: ≥131.5℃, ensuring structural stability at high temperatures.
Longitudinal Retraction Rate: ≤2%, strong resistance to thermal expansion and contraction.
Melt Flow Rate (MFR): The change rate under 230℃/2.16kg is ≤30%, avoiding the mixing of recycled materials.
Connection Performance
The tensile strength of hot-melt connection is ≥80% of the pipe body strength, ensuring tightness.
Electro-fusion connection quality is judged by "ejection of welding indicator pin", compatible with pipes of different brands.
Installation Key Points
Hot Melt Connection Steps
Cutting: Use a pipe cutter to cut the pipe vertically and remove burrs.
Heating: Control the temperature of the hot melter at 260±5℃, and heat the pipe and fitting simultaneously for 5-24 seconds (adjust according to pipe diameter).
Connection: Insert vertically and hold for 10-12 seconds, avoiding rotation or excessive pressure.
Cooling: Cool naturally for 5-10 minutes, and avoid disturbance during this period.
Precautions
Pipes and fittings must be of the same brand to ensure fusion compatibility.
During winter construction, preheat the pipes to above 5℃ to avoid cracking due to cold brittleness.
For maintenance scenarios, non-hot-melt quick connectors or extended die hot melters can be used to simplify operations.
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