FRP Pultrusion Mould

FRP Pultrusion Mould are the core tooling components for profile forming and play a critical role in controlling dimensional accuracy, surface finish, and production stability.

Capability	Our Manufacturing Range
Profile Shapes	I Beam, Channel, Angle, Tube, Rod, Flat Bar, Custom
Resin Systems	Polyester, Vinyl Ester, Epoxy, Polyurethane
Length	Custom Cut Lengths Available
Surface Finish	Smooth, Gritted, UV Resistant
Tolerance	Manufactured in accordance with ASTM D3917 dimensional requirements.
OEM / ODM	Supported

Product categories

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Product details

Main Structure of FRP Pultrusion Mould

FRP Pultrusion Mould consist of multiple functional components working together. Each part is precisely designed to ensure profile forming quality, dimensional accuracy, and production stability. The key structures include:

Mould Body

As the main load-bearing structure, the mould body is precision-machined to control cavity dimensions and overall straightness. It ensures accurate profile geometry and smooth surfaces while preventing deformation and dimensional deviations during production.

Mould Core Rod

Designed for hollow profiles such as round tubes, square tubes, and customized hollow sections, the core rod precisely controls inner diameter and wall thickness. It helps prevent eccentricity, uneven wall thickness, and twisting, ensuring consistent hollow profile quality.

Temperature Control & Heating System

The mould features a built-in uniform heating channel system to maintain stable temperature distribution throughout the mould cavity. This ensures complete and even resin curing, eliminating defects such as soft cores, delamination, incomplete curing, and surface deformation.

Working Principle of GRP pultrusion mould

During the pultrusion process, resin-impregnated fiberglass is precisely aligned through the guiding system and continuously fed into the mould cavity. The material is then compressed, shaped, and fully cured under controlled heating conditions. After continuous pulling and stretching, the finished profile is formed with consistent dimensions and cross-sections, followed by precise cutting to the required length.
The highly automated process ensures uniform forming, excellent batch consistency, and stable continuous production, significantly improving manufacturing efficiency and product quality.

The working principle of pultrusion mold

Core Process & FRP Pultrusion Mould Advantages

Premium Material & Long Service Life

FRP Pultrusion Mould are made from high-quality alloy steel with hardening treatment and mirror polishing, providing excellent hardness and wear resistance. The mould structure and heating system are optimized for different resin systems, including polyester, epoxy, and polyurethane, reducing resin buildup and demoulding resistance while extending mould life.

Precision Machining & High Accuracy

Integrated CNC precision machining ensures strict control of cavity tolerances and straightness. Optimized fiber guidance and feeding structures ensure smooth fiberglass alignment and uniform resin impregnation, effectively preventing defects such as resin shortage, delamination, twisting, and surface waviness, while improving profile consistency and yield rate.

Stable Continuous Production Performance

Built-in balanced heating channels provide uniform temperature distribution and controlled mould cavity heating, ensuring complete resin curing and consistent product performance. The mould effectively reduces defects such as uneven curing, color variation, and internal soft cores, supporting high-efficiency continuous pultrusion production.

Integrated Manufacturing Capability & Custom Solutions

With in-house pultrusion equipment development, FRP profile production, and mould manufacturing, we provide optimized tooling solutions based on real production conditions. We support custom mould design for round tubes, square tubes, I-beams, channels, angles, electrical insulation profiles, railing profiles, and other non-standard sections based on drawings or samples.

Suitable Customers

FRP Profile Manufacturers with Existing Pultrusion Lines

Manufacturers requiring new moulds and customized non-standard FRP profile sections for new product development, capacity expansion, and mass production.

Manufacturers Upgrading Old FRP Pultrusion Mould

Factories facing low mould accuracy, resin buildup, poor surface finish, low output, and reduced yield, requiring high-quality mould replacement solutions.

FRP R&D and Custom Profile Developers

Companies focused on FRP innovation that need customized moulds, new profile development, trial mould testing, and cross-section validation for new applications.

FAQ

An FRP Pultrusion Mould is the core tooling for continuous profile forming. Resin-impregnated fiberglass passes through the heated mould cavity for curing, producing FRP profiles with fixed cross-sections continuously.
Custom moulds are required for new profile development, non-standard sections, special project requirements, worn or inaccurate existing moulds, or when switching to different resin systems such as epoxy or polyurethane.

With our in-house machining facilities and mould testing equipment, all processes are completed internally, ensuring stable and controllable delivery times:
Standard profile moulds (such as round rods, square rods, and flat bars): 15 working days；
Hollow tube moulds and standard railing profile moulds: 20 working days；
Thin-wall, complex-section, and high-precision moulds for epoxy/polyurethane profiles: 30 working days；
After order confirmation, we provide an accurate production schedule and delivery time based on the drawing complexity and mould requirements.

Yes. Our moulds are compatible with unsaturated polyester, epoxy, and polyurethane resin systems. Based on the selected resin type, we optimize the mould cavity treatment and heating structure to reduce resin buildup, minimize mould wear, and ensure stable mass production for different FRP applications.

Mould polishing requires fine grinding and careful handling. Hard tools should never be used on the mould cavity to prevent surface scratches.
During production, resin buildup inside the cavity should be cleaned regularly to avoid carbonized residue affecting demoulding performance. Before equipment shutdown or long-term storage, the mould should be thoroughly cleaned and treated with rust protection to maintain a smooth cavity surface and reduce demoulding resistance.

Yes. Minor adjustments, such as hole enlargement and small dimensional modifications, can be made. However, reducing the profile size or making major structural changes may affect machining accuracy and mould performance. For better production stability and quality consistency, a new mould is usually recommended.

Before delivery, each mould undergoes strict machining accuracy inspection and basic trial testing to ensure precise dimensions, correct structure, and reliable forming performance.
During normal operation, we provide dedicated technical support and production commissioning guidance. The warranty covers manufacturing quality issues of the mould itself. Damage caused by improper handling, incorrect operation, normal wear, or changes in resin formulation and production processes is not included.