Pultrusion die
Structural profile pultrusion dies
A structural profile die forms open sections such as I-beams, channels and angles, or wide multi-web sections such as deck boards and sheet pile. These dies are split into several plates so the cavity can be machined, chrome-plated and cleaned, and they need careful heat balance between thick flanges and thin webs.
Specification
Configuration table
Every cell is either a figure supplied by the factory or TBD · ask factory. No typical values. Source: frpzs.com pultrusion die (mould) catalogue pages, fetched 2026-10-19; values are catalogue statements confirmed per die on the drawing.
| Parameter | Value |
|---|---|
| Die steel options | 40Cr, P20, Cr12MoV, 38CrMoAl or H13 (by application) |
| Base hardness | HRC 55–60 (catalogue) |
| Cavity surface treatment | Quench and temper, nitriding or induction hardening, hard chrome plating |
| Hard chrome thickness | 0.04–0.05 mm (catalogue) |
| Straightness | ≤ 0.02 mm over 1,000 mm (catalogue) |
| Profile dimensional tolerance | ±0.1 to ±0.3 mm depending on section (catalogue) |
| Resin systems | UP polyester, vinyl ester, epoxy, phenolic, polyurethane |
| Service life before re-chrome (m) | TBD · ask factory |
| Lead time (working days) | TBD · ask factory |
Scope of supply
What is included, what is quoted separately
The single most requested clarification from buyers. Both lists appear on the quotation.
Included in the base quotation
- DFM review of your cross-section and fiber layout
- 3D die model for your approval before steel is cut
- Machined, heat-treated and chrome-plated die with heating-plate interface
- Preforming guides for the profile
- Trial pull on the factory's own line with dimensional report and samples
Quoted separately on request
- Heating plates and thermocouples if your machine lacks them
- Mandrels and mandrel supports for hollow profiles (listed per die)
- Re-chroming and refurbishment of worn dies
- Resin injection box (for closed injection instead of an open bath)
- Shipping of trial samples by air
Cross-sections
Profiles covered by this die family
- I-beams and wide-flange beams
- Channels (C-sections)
- Equal and unequal angles
- GRP toe plate
- Handrail sections
- Grating T-bars and bearing bars
- Deck boards 130 × 27, 150 × 18 and 200 × 50 mm
- Flat strip 150 × 5 mm
- Sheet pile sections
- Ladder rails and shutter slats
Process
From drawing to die
What you supply and what you receive at each step.
- 01
Cross-section review
Buyer + die engineer
You send the drawing, resin system and target speed. The team checks wall thickness, radii and corners for pultrudability.
- 02
DFM feedback
Die engineer
Written feedback on changes that improve cure, fiber placement and die life, with the proposed fiber layout.
- 03
3D model approval
Buyer approval
Die plates, mandrel, heating layout and guide plates are modeled. Steel is cut only after you approve.
- 04
Machining and chrome
Die shop
Gantry milling, CNC, EDM and wire-cut, heat treatment, polishing and hard chrome plating.
- 05
Trial pull and report
Factory QC
The die runs on the factory's own line. You receive samples and a dimensional report before shipment.
From the workshop
Photographs
Commercial terms
Who you contract with
- Manufacturer and warranty party
- Henan Zhongsheng Composite Material Co., Ltd.
- Contracting party and exporter of record
- Pultruded Export, Shanghai, China
- Incoterms
- FOB Chinese port by default; CIF/DAP on request
- Payment
- Milestones tied to drawing approval, FAT acceptance and shipment. Exact split on the quotation.
- Third-party inspection
- SGS, BV or TÜV pre-shipment inspection accepted, cost borne by the buyer
- Electrical
- 380 V 50 Hz standard; 480 V 60 Hz and other supplies on request. CE-oriented panel standard; UL 508A option quoted separately.
FAQ
Questions buyers ask
- How do you deal with thick flanges and thin webs?
- Heating zones, plate splits and die-land length are arranged so thick and thin areas cure at a similar rate. The thermal concept is reviewed at DFM before machining.
- Do you design to EN 13706 grades?
- The die determines geometry; the E17 or E23 grade depends on fiber content, resin and process. Tell the team the target grade so the fiber layout and die land are designed for it.
- Can you build sheet pile dies?
- Yes. Sheet pile sections are wide and need high pull force; the die and machine are usually quoted together.
- Will you copy a competitor's profile?
- The factory works from your drawing. It does not reproduce sections protected by a third party's design rights.
Next step
Send a cross-section drawing. Get a DFM review and a scoped quotation.
Quotations state the manufacturer, the exporter of record, the warranty party, FAT scope and payment milestones. No figure is quoted without a drawing.