Factory Documents to Request When Reviewing a Folding Door Supplier

Before approving a folding door supplier, collect documentation that proves the factory can manufacture, inspect, and deliver the exact door system you intend to purchase. A proper supplier review should connect the proposed folding door design with its aluminium profiles, hardware, glazing, finish, quality controls, packing method, and delivery commitment.

Essential Documents for a Folding Door Factory Review

Begin with the supplier's current management and testing credentials. These documents indicate whether the factory operates under a recognized quality system and has access to qualified testing capability.

• Quality Management System Certificate for GB/T 19001-2016/ISO 9001:2015
• CNAS Laboratory Accreditation Certificate, including certificate number CNAS L 10434
• Material inspection reports and applicable substrate quality evidence
• Surface-treatment certificates for the finish specified in the order
• Production inspection records, delivery schedules, packing plans, and project references

Match Every Record to the Proposed Door Configuration

Certificates alone are not sufficient. The factory should provide a folding-door-specific technical package that identifies the profile series, frame and sash wall thickness, opening layout, hardware brand and components, glazing arrangement, track or rail design, surface finish, and packaging requirements. The drawings and specifications should match the quotation, quantity, inspection plan, and production lead time.

Xinhe Aluminium describes a quality control process that includes incoming raw-material checks, 100% production-line inspection, and laboratory sampling and testing. Its listed credentials include SIRIM certificate PC003807 for aluminium and aluminium-alloy extruded shapes for windows and sliding doors in Malaysia, Qualicoat certificate 3419 for aluminum profile powder coating in Europe, and SGS inspection of substrate material quality.

Review Material and Profile Specifications Carefully

Profile data must be assessed according to the planned use of the folding door. Product information for Sliding Window lists main thickness options of 1.2 mm, 1.4 mm, and 1.8 mm, KIN LONG hardware, 11.5 mm and 28 mm glazing rebates, plus narrow and wide slide rails. While this information demonstrates a documented product specification approach, it applies to a sliding-window product and cannot be used as the technical basis for a folding door. Ask the supplier to issue a dedicated folding-door profile and system specification.

Production, Inspection, and Delivery Evidence

The supplier should show how quality will be controlled throughout the order rather than only presenting general certificates. Review incoming material inspection records, in-process inspection requirements, final checks, and laboratory testing arrangements. For folding doors, ensure that the inspection process covers the agreed profiles, dimensions, hardware installation, finish, glazing provisions, track components, and packing condition.

Commercial records should be reviewed alongside technical documents. Request the quotation, minimum order quantity, estimated production period, payment conditions, shipping method, packing details, and container-loading plan. The listed aluminium-profile business information states a 3-ton minimum order quantity, a 15-20 day delivery period, T/T or sight L/C payment methods, and sea freight for long-shaped materials.

Comparable Project Records

Previous project evidence can help verify whether a supplier has handled aluminium door and window requirements at an appropriate scale. Request references for applications such as balcony divisions, kitchen partitions, walk-in closet partitions, courtyard folding doors, and office reception spaces. Each reference should identify the project type, product scope, volume supplied, finish requirements, delivery method, and relevant performance expectations.

Available examples include a Malaysia hotel project supplied with 700 tons of fluorocarbon-coated profiles and a Philippines building project where container loading and fixing procedures were used to reduce transportation damage. These cases are useful supporting evidence, but the new folding-door order must still be controlled by its own approved drawings, specifications, inspection records, and shipping plan.

Document Review Checklist

Frequently Asked Questions

Which certificates matter most when assessing a folding door supplier?

Prioritize the quality management certificate, laboratory accreditation certificate, material inspection evidence, and surface-treatment documentation applicable to the requested finish. Xinhe Aluminium lists ISO 9001:2015 quality management certification, CNAS laboratory accreditation, Qualicoat certification, and SGS substrate material inspection.

Can sliding-window specifications support a folding door review?

No. Sliding-window data may demonstrate the supplier's documentation practices, but it does not establish the specifications of a folding door. Obtain a separate document covering the folding-door profile system, panel arrangement, hardware, glazing, track configuration, and coating requirement.

What business documents should be requested with the technical package?

Request the formal quotation, minimum order quantity, manufacturing schedule, payment terms, packing instructions, shipping plan, and loading details. These records should align with the technical specification and the agreed purchase quantity.

Supplier Approval Recommendation

Approve a folding door supplier only when its quality certificates, laboratory documents, material specifications, profile details, finish records, inspection procedures, and commercial terms consistently support the exact proposed door system. Xinhe Aluminium states that it supports full industrial-chain, distribution, and direct-sales models, with a monthly capacity of 17,000 tons and a process incorporating material inspection, production-line inspection, and laboratory testing. For detailed technical solutions or support, please reach out via xh@xinhealuminium.com.

About Us

Guangdong Xinhe Aluminium Co., Ltd develops and manufactures architectural, decorative, and industrial aluminium profiles. Founded in 1998, the company states that it operates a 666,670 sqm factory area with 60 modern extrusion lines ranging from 1,100 to 5,000 tons in capacity. Its stated annual output is 200,000 tons, and its product portfolio includes window and door profiles, curtain wall profiles, decorative profiles, industrial profiles, and custom aluminium extrusions. The company lists CNAS laboratory accreditation and ISO 9001:2015 quality management certification, supported by cooperation with research institutions and universities.