OPaL HDPE Opalene P51H10

OPaL HDPE Opalene P51H10 (also searched as Opalene P51H10 / HDPE P51H10 / OPAL HDPE P51H10) is a high density polyethylene (HDPE) polyolefin grade from ONGC Petro additions Limited (OPaL), engineered for pipe extrusion. OPaL describes it as a natural-colored HDPE produced using Mitsui CX slurry polymerization technology, designed to deliver very good processing properties, good mechanical properties, excellent stress crack resistance, and good creep resistance.

For buyers evaluating pressure-pipe resins, P51H10’s key differentiator is that OPaL identifies it as a PE100 grade (ISO 12162) with a Minimum Required Strength (MRS) classification of 10 MPa (ISO 9080). That standards-backed positioning is why this grade is selected for drinking-water pressure pipes, irrigation pipes, and other pipe systems where long-term performance and regulatory confidence matter.

OPaL positions P51H10 for a broad pipe basket: pressure pipes for drinking water and irrigation, pipes for civil engineering and drainage, and corrugated tubes and pipes, including large-diameter irrigation pipes.

Manufacturer: ONGC Petro additions Limited (OPaL) (India)

Technical insights

The following are manufacturer-stated typical values and pipe-performance figures used by processors and project buyers to evaluate PE100 pipe resins.

• PE100 designation (ISO 12162) & MRS 10 MPa (ISO 9080): These classifications support pressure-pipe design confidence and indicate the resin’s long-term strength category for hydrostatic applications.
• MFI 0.45 g/10 min (190°C/5.0 kg, ASTM D1238): A low melt flow typical for pipe extrusion, supporting melt strength and robust mechanical performance while maintaining workable processing behavior.
• Density 0.951 g/cm³ (23°C, ASTM D1505): Supports stiffness and dimensional stability in extruded pipes—important for handling, installation, and service performance.
• ESCR >600 hours (ASTM D1693B, F50, 10% Igepal): Environmental stress crack resistance is a key durability indicator for pipe systems exposed to long-term stress and challenging environments.
• Tensile strength at yield 23 MPa (ASTM D638): A baseline strength indicator relevant to load-bearing performance in pipe applications.
• Elongation at break >700% (ASTM D638): Indicates ductility, helping pipes tolerate deformation and installation stresses without brittle failure.
• Notched Izod impact >200 J/m (23°C, ASTM D256A): Supports toughness during transport, handling, and installation.
• OIT >30 minutes (ASTM D3895): Oxidative Induction Time indicates stabilization against oxidation; relevant for processing stability and long-term performance expectations.
• SCG 430 hours (ISO 13479, notch pipe test at 80°C, 8.0 bar): Pipe-specific slow crack growth performance data used to assess durability under sustained stress.
• RCP-S4 critical pressure at 0°C ≥10 bar (ISO 13477): Rapid crack propagation indicator relevant to safety margins in certain operating conditions.

Processing guidance: 180–220°C (recommended). Storage guidance: keep away from direct sunlight/heat, store dry and dust-free, and keep storage temperature below 50°C.

Applications

Potable-water pressure pipes (PE100): Opalene P51H10 is designed for drinking-water pressure pipe extrusion where long-term hydrostatic strength and crack resistance are critical. Buyers typically shortlist PE100 HDPE grades like P51H10 when projects require standards-backed material selection and consistent performance.

Irrigation pipes and large-diameter irrigation lines: For agricultural and industrial irrigation networks, processors need a balance of processability and durability. P51H10 is positioned for irrigation pipes, including large-diameter applications, where toughness and resistance to slow crack growth support long service life.

Civil engineering and drainage pipes: Civil and drainage pipe systems often prioritize stiffness, toughness, and resistance to cracking during installation and service. P51H10’s pipe-grade density and crack-resistance indicators support these requirements in practical field conditions.

Corrugated tubes and corrugated pipes: Corrugated pipe applications demand consistent extrusion behavior and durability. P51H10 is positioned for corrugated tubes and pipes, making it relevant for processors seeking a PE100-class pipe resin for structured-wall pipe formats.

Comparable alternatives

The safest comparison set for OPaL HDPE Opalene P51H10 is other manufacturer-documented PE100 pipe grades available in India. Direct equivalence should only be claimed after a side-by-side review of the manufacturer technical data sheets.

• Opalene P50H03 vs P51H10 (both PE100): Both are positioned as PE100 with MRS 10 MPa, but they differ in typical flow and crack-resistance indicators. P51H10 shows MFI 0.45 and ESCR >600 h, while P50H03 is documented with lower MFI (0.27) and higher ESCR (>1000 h) in the provided dataset. Selection typically depends on the processor’s extrusion setup, pipe dimensions, and the specific performance emphasis required.
• Other PE100 pipe grades in India: Comparable PE100 grades exist across suppliers, but “substitute grade” claims are not confirmed without matching PE100/MRS documentation and comparable SCG/RCP and ESCR/OIT context.
• Generic HDPE (non-pipe) grades: Even if density/MFI appear close, non-pipe grades may not provide PE100/MRS and pipe-test context. For pressure-pipe and potable-water projects, PE100 positioning and pipe-performance indicators are the differentiators.

Common search variants

Also searched as: Opalene P51H10, HDPE P51H10, Opalene HD P51H10 granules, PE100 HDPE grade OPAL, P51 H10, P51H10 MFI 0.45, HDPE pipe dana / polyethylene granules.