What is the meaning of the SDR abbreviation with which the PP-R pipe is classified? SDR (Standard Dimension Ratio) identifies the “standard dimensional ratio” that is a method for evaluating the durability of a pipe with respect to pressure. The standard size ratio describes the correlation between pipe size and pipe wall thickness.

• Random copolymer polypropylene tubes available in 4 versions: 
  • GREENTHERM SDR 6 single layer (green color) 
  • GREENTHERM SDR 7.4 FASER 3-layer (green color) 
  • GREENTHERM SDR 7.4 FASER UV Resistance 3 layers (black color) 
  • POLO-KLIMA SDR 11 with 5-layer mineral fibers (blue color with green lines) 
    ATTENTION: this type of pipe is not suitable for the transport of drinking water 
• Random polypropylene fittings with optional brass insert 
• Maximum operating temperature: see table in relation to pressure and operating time 
• Maximum operating pressure: see table in relation to temperature and operating time 
• Minimum operating temperature (for refrigeration systems) equal to 6 ° C 
• Internal roughness of 0.007 mm. 
• Thermal conductivity equal to 0.024 mm / mK 
• Coefficient of linear thermal expansion equal to 0.15 mm / mK 
• Melting point achievable at 140-150 ° C 
• Welding times: see table in relation to diameter and environmental conditions 
• Diameters of 20, 25, 32, 40, 50, 63, 75, 90, 110 mm. 
• 10-year warranty against manufacturing defects