Apr 14, 2020 · The HDPE pipe was price as per standard dimensional ratio which are SDR 9 , SDR 11, SDR 13.6, SDR 17 and SDR 21. Each SDR has rresponding nominal pressure rating which are PN 20, PN 16, PN 12.5, PN10, PN 8 and PN 6. All the prices listed are in Philippine Peso (Php) with value added tax (VAT) included.