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Overview

There have been recent reports of several serious incidents involving cutting HDPE and RCP pipe with handheld saws in Manitoba.

Why cutting HDPE with abrasive blades is a concern:

  • Material properties: HDPE is a heat-sensitive thermoplastic with a melting point of 120–180°C.
  • Blade temperatures: Segmented diamond blades often reach 250–700°C, creating a high risk of overheating. Excessive heat can melt HDPE, causing material to fuse to the blade. This can lead to:
    • Blade binding and seizure.
    • Increased risk of kickback.
    • Further melting if additional force is applied.

Additional risks when cutting RCP

  • Asbestos hazard: Some reinforced concrete pipes contain asbestos, a known carcinogen linked to:
    • Asbestosis
    • Lung cancer
    • Mesothelioma
  • Exposure risk: Cutting RCP can release asbestos fibres, which can be inhaled by workers.
  • Employer responsibilities:
    • Maintain an asbestos inventory.
    • Ensure testing by a competent person.
    • Implement a control plan with safe work procedures for asbestos remediation.

Prevention measures

Employers must:

  • Comply with regulations:
    • Use tools and equipment only for their intended purpose (Part 16.4(1) & 16.4(3), Workplace Safety and Health Regulation).
    • Ensure workers are trained and competent in safe saw operation (Part 16.2(1)).
  • Prohibit abrasive blades for HDPE:
    • Use fine-tooth carbide blades with lubricant for heat control.
  • Safe cutting practices:
    • Make multiple cuts for large-diameter HDPE/RCP.
    • Support pipes to prevent movement.
    • Use wedges to maintain gaps.
    • Follow manufacturer specifications.

If you have questions about this topic, contact the SAFE Work Manitoba division.