Used in domestic plumbing systems for cold/hot water supply and in heating systems with radiators. -hot water supply: Class 1 design temperature related to service life: 60°C/49 years + 80°C/1 year + 95°C/100 hours. Class 2 design temperature related to service life: 70°C/49 years + 80°C/1 year + 95°C/100 hours. -high-temperature radiator heating: Class 5 design temperature related to service life: 80°C/10 years + 60°C/25 years + 20°C/14 years + 90°C/1 year + 100°C/100 hours. Reference standard: – EN ISO 15875-2:2003—production, testing, scope of application – DIN 4726—for the oxygen barrier Material: PE-X—cross-linked polyethylene. Cross-linking method: peroxide—PE-Xa Oxygen barrier (EVOH) (ethylene-vinyl alcohol copolymer) prevents oxygen ingress from the atmosphere and thus oxidation of the metal components in the system. Pressure rating: 10 bar Color: silver. Construction: 3 layers—1—PE-Xa. 2—Adhesive. 3—EVOH oxygen barrier.