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Felt CIPP Liner vs Fiberglass Liner

Selecting between polyester felt and woven fiberglass reinforcement

Comparison

Felt CIPP Liner vs Fiberglass Liner

CIPP liners use one of two reinforcement systems: polyester felt or woven fiberglass. The choice affects mechanical performance, cost, curing method compatibility, and best-fit applications. This article compares the two reinforcement systems across six dimensions.

Felt CIPP Liner vs Fiberglass Liner
Side by Side

Comparison Matrix

CriterionFelt CIPP LinerFiberglass Liner
Reinforcement TypePolyester needle-punched feltWoven fiberglass roving
Tensile StrengthGoodHigher (fiberglass strength)
Flexural ModulusStandard CIPP gradeHigher — > 10,000 MPa
Compatible CuringSteam, hot water, ambientUV light cure (primary)
Cost per m²LowerHigher
Best ApplicationLarge-diameter drainage, sewersHigh-strength, year-round, water supply
Installation MethodInversion (preferred)Pull-in (preferred)
Wall ThicknessThicker walls typicalThinner walls possible
Engineering Verdict

Which method to choose?

Polyester felt is the cost-effective choice for inversion-installed CIPP in drainage applications. Woven fiberglass delivers superior mechanical performance and is the standard reinforcement for UV-CIPP systems, particularly in water supply rehabilitation where structural integrity and sanitary compliance are both critical.

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