Get Quote
Home/CIPP Technology/Composite Spraying Process

Composite Spraying Process

Cement mortar + polyurethane spray-lining for structural and corrosion repair

Overview

The Composite Spraying Process explained

The composite lining repair method spray-applies a high-strength, anti-corrosive mortar to form a robust mortar lining, then coats it with a high-strength, high-rigidity polyurethane material. The combination provides structural reinforcement plus corrosion protection for 50 years.

Working principle

Specialized spray guns or atomizers use pressure and centrifugal force to uniformly coat the inner surface of the host pipe with cementitious material. High-speed rotary sprayers handle pipes from DN300 to DN800; handheld spray guns are used for diameters above DN800. Once the mortar reaches its final set, a layer of high-strength polyurethane is applied. The mortar provides structural strength and durability; the polyurethane adds abrasion resistance, chemical resistance, and waterproofing — and the smooth polyurethane surface minimizes flow resistance.

Composite Spraying Process
Step-by-Step

Process Stages

From pre-installation inspection through post-cure acceptance — here's the full project workflow.

Surface Preparation

High-pressure water cleaning, debris removal, surface profiling.

Equipment Setup

Cementitious lining vehicle deployed at access point.

Mortar Spraying

Rotary sprayer (DN300-800) or handheld gun (>DN800) applies mortar.

Mortar Cure

Allowed to reach final set per specification.

Polyurethane Application

High-strength polyurethane sprayed atop the cured mortar.

Final Inspection

CCTV verification of coating uniformity and coverage.

Why this method

Key advantages

  • Combined structural repair + corrosion protection
  • Suitable for any cross-sectional shape
  • Applicable to pipes, culverts, tunnels, manholes, septic tanks
  • Smooth polyurethane finish improves hydraulic performance
  • Flexible mortar:polyurethane ratio per project requirements
  • 50-year corrosion protection design life

Is Composite Spraying right for your project?

Send your pipe diameter, length, and host material — our engineers will recommend the optimal method for your specific project conditions.

Get a Method Recommendation