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Marlex® HHM TR-418Q Medium-Density Polyethylene (MDPE)

Performance Pipe - cropped

Marlex® HHM TR-418Q medium-density polyethylene (MDPE) is a high-performance ethylene-hexene copolymer designed for demanding pressure pipe applications. It provides long-term hoop strength, outstanding resistance to slow crack growth, and built-in UV stabilization for outdoor performance in energy, oil field and industrial piping systems.

Building on decades of polyethylene manufacturing expertise, CPChem produces Marlex® MDPE resins using advanced catalyst technologies and stringent quality controls. This foundation delivers consistent resin quality and reliable pressure pipe performance across demanding service conditions. 

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Product Information
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Contacts

Kyle Miller

Polyethylene Sales | US & Canada

Americas

832-813-4372

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Sammy Zuehlke

Polyethylene Sales | LATAM

Americas

832-813-4722

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Chevron Phillips Chemical Company LP

General

Americas

+1-832-813-4100

Norman Chua

China Country Manager / North Asia Polymers Manager

Asia

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Jack Wee

South Asia Polymers Sales Managers

Asia

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Chevron Phillips Chemicals Asia Pte Ltd

Asia Region Polymer sales

Asia

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Low Wah Chye

ASEAN Polymers Sales Manager

Asia

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Chevron Phillips Chemicals International N.V.

Europe, Middle East, Africa

+32-0-2-689-12-11

John Van Gansberghe

Polymers Sales

Europe, Middle East, Africa

+32-0-2-689-12-43

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Properties

Nominal Physical Properties

PropertyTypical ValueTest Method
Density0.939 g/cm3ASTM D1505
Flow Rate (HLMI, 190°C/21.6 kg)20.0 g/10 minASTM D1238
Flow Rate (MI, 190°C/2.16 kg)0.20 g/10 minASTM D1238
Flexural Modulus (2% Secant)620 MPa (90,000 psi)ASTM D790
Tensile Strength at Yield19 MPa (2,800 psi)ASTM D638
Tensile Elongation at Break800%ASTM D638
PENT Slow Crack Growth> 2,000 hASTM F1473
Brittleness Temperature< -75°C (< -103°F)ASTM D746

Nominal Pipe Properties

PropertyTypical ValueTest Method
Hydrostatic Design Basis (73°F / 23°C)8.6 MPa (1,250 psi)ASTM D2837
Hydrostatic Design Basis (140°F / 60°C)5.5 MPa (800 psi)ASTM D2837
Minimum Required Strength8.0 MPa (1,160 psi)ISO 9080
Rapid Crack Propagation (Full scale, 0°C / 32°F)8.5 bar (123 psi)ISO 13478

Nominal properties reported are typical of the product but do not reflect normal testing variance and therefore should not be used for specification purposes. Values are rounded. Physical properties were determined on compression molded specimens prepared in accordance with Procedure C of ASTM D4703, Annex A1 or ASTM F1473. Nominal pipe properties were determined on pipe extruded from a pellet blend of HHM TR-418Q and an approved yellow concentrate. Rapid Crack Propagation (RCP) properties were determined on 6″ SDR 11 pipes and 8″ SDR 11 pipes.

Specifications: When blended with an approved yellow concentrate, this material meets or exceeds these standards: ASTM D4976 - PE 225  |  NSF 3rd party D2513 certified  |  ASTM D3350, Cell Class PE234373E and PE234375E  |  PPI designations PE 2708 and PE 80  |  CSA approved for natural gas

Key Characteristics of Marlex® HHM TR-418Q MDPE 

Engineered for demanding pressure pipe applications, Marlex® HHM TR-418Q is an ethylene-hexene copolymer that delivers the long-term hoop strength, slow crack growth resistance, and outdoor durability that pipe specifiers and utility engineers depend on. 

Key characteristics include: 

Good Long-Term Hoop Strength: Maintains pressure-bearing performance over decades of service in buried pipe and pressure infrastructure applications 

UV Stabilizer for Outdoor Storage Life: Built-in UV protection allows extended outdoor storage of pipe stock without degradation prior to installation 

Outstanding Slow Crack Growth Resistance: PENT performance exceeding 2,000 hours protects against the long-term failure mode that drives most pipe service-life concerns 

These MDPE resin properties make Marlex® HHM TR-418Q PE a dependable choice for pipe and tubing applications requiring durability and long-term performance.

MDPE Resin for Pressure Pipe and Infrastructure Applications

MDPE resins are engineered for semi-rigid pressure pipe and infrastructure applications. Marlex® HHM TR-418Q MDPE is optimized for pressure pipe extrusion.

Pipe & Corrugated Extrusion

Non-exhaustive list of applications:

  • Energy piping systems
  • Oil field pipe
  • Industrial pipe

 

These applications benefit from Marlex® HHM TR-418Q MDPE’s ability to deliver long-term pressure resistance, slow crack growth performance, and dependable service life.

Contact our polyethylene specialists for processing support

Why Choose CPChem as Your Pressure Pipe MDPE Supplier

Proven Pipe-Grade Performance

With decades of polyethylene manufacturing experience, CPChem delivers the consistent quality and proven performance that pipe extruders, utilities, and infrastructure specifiers depend on.

Industry-Leading Certifications

Marlex® HHM TR-418Q meets PE 2708 and PE 80 designations, ASTM D3350 cell classifications, NSF D2513 certification, and CSA approval for natural gas service.

Proprietary MarTECH® Process

Our MarTECH® loop slurry process and advanced catalyst technologies deliver the uniform molecular structure and slow crack growth resistance that demanding pressure pipe applications require.

Technical Service and Support

Our experienced technical teams partner with pipe extruders to support resin qualification, troubleshoot processing challenges, and optimize long-term pipe performance.

Reliable Global Supply

Our global manufacturing footprint provides the consistent quality and dependable supply that pipe extruders and utility customers require to keep critical infrastructure projects moving.