Authoritative definitions of the four most-cited benchmarks used in PPR pipe specification across the UAE and GCC.
- WRAS (Water Regulations Advisory Scheme) is the United Kingdom certification confirming that a plumbing material is safe for contact with potable drinking water. RakPlus PPR pipes and brass-insert fittings carry WRAS approval — the international benchmark demanded by consultants and municipalities across the UAE, Saudi Arabia, Qatar, Kuwait, Bahrain, and Oman.
- SDR (Standard Dimension Ratio) is the ratio of a pipe's outer diameter to its wall thickness. A lower SDR means a thicker wall and a higher pressure rating. RakPlus PPR pipes are manufactured in SDR 11 (PN10), SDR 7.4 (PN16), SDR 6 (PN20), and SDR 5 (PN25) — covering every UAE plumbing pressure class from residential cold-water distribution to industrial high-pressure risers.
- PN20 is the pressure class rating for a pipe that withstands a continuous operating pressure of 20 bar at 20°C. RakPlus PN20 PPR pipes have an SDR of 6 (SDR6) and are the most common specification for hot-water recirculation loops, high-rise residential risers, and commercial plumbing across the GCC. Operating temperature: 70°C continuous, 100°C short-term peak.
- DIN 8077 and DIN 8078 are the German Standard dimensional and quality specifications for polypropylene (PP-R) pressure pipes. RakPlus PPR pipes are manufactured in strict accordance with DIN 8077 (pipe dimensions) and DIN 8078 (general quality requirements), and welded to DVS 2207 parameters — the same standards specified by European and Gulf-region consulting engineers.