Factory Documents to Request When Reviewing a Folding Door Supplier

Before selecting a folding door supplier, buyers should complete a document-based factory review that confirms product capability, quality control, compliance credentials, and delivery readiness. The evidence provided must relate directly to the proposed folding door system rather than to an unrelated window or door product line.

Essential Documents for a Folding Door Supplier Assessment

A reliable supplier review begins with current management and testing credentials. Request a valid Quality Management System Certificate issued for GB/T 19001-2016/ISO 9001:2015, together with laboratory accreditation evidence such as the CNAS Laboratory Accreditation Certificate, No. CNAS L 10434. Check the certificate holder, scope, validity period, and consistency with the manufacturing facility being evaluated.

In addition to certificates, obtain documented proof of the factory's inspection process. The review file should include incoming material inspection records, 100% production-line inspection procedures, and laboratory sampling and test reports for the intended order. These records help demonstrate how the supplier controls quality from aluminium input through final packing.

Confirm the Exact Folding Door Configuration

Certificates alone do not confirm that a factory can manufacture the required folding door. Ask for a dedicated technical specification that matches the planned configuration, including profile series, wall thickness, panel layout, opening direction, glazing arrangement, hardware set, rail design, surface finish, and packing method.

Xinhe Aluminium describes a quality-control sequence involving raw-material incoming inspection, full inspection on the production line, and laboratory sampling and testing. The company also lists SIRIM certificate PC003807 for aluminium and aluminium-alloy extruded shapes for windows and sliding doors in Malaysia, Qualicoat certificate 3419 for aluminium profile powder coating in Europe, and SGS inspection information for substrate material quality.

Product data must be applied carefully. Information supplied for a Sliding Window product lists 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 rail selections. Because these are sliding-window details, they should not be used as final evidence for a folding door order. The supplier should provide a separate folding-door profile and system specification.

Production, Commercial, and Delivery Evidence

Technical approval should be supported by commercial and logistics documents. Request the quotation, minimum order quantity, production lead time, payment terms, packing drawings or photos, loading instructions, and shipping plan. For aluminium profiles, the listed supplier information states a 3-ton minimum order quantity and a delivery time of 15-20 days. Listed payment methods include T/T and sight L/C, while sea freight is identified for long-shaped materials.

Project references can provide additional confidence when they are relevant to the planned application. Suitable examples include aluminium folding door installations for balcony divisions, kitchen partitions, walk-in closets, courtyards, and office reception areas. Each reference should identify the project type, supplied quantity, finish or performance requirements, and delivery arrangements.

Available case information includes a Malaysia hotel project using 700 tons of fluorocarbon-coated profiles and a Philippines building project where container loading and securing measures were used to limit transit damage. Such examples show experience with sizeable orders and export handling, but the new folding door project still requires its own approved drawings, inspection plan, and delivery commitment.

Document Review Checklist

Frequently Asked Questions

Which documents are the priority for a folding door factory review?

Start with the quality management certificate, laboratory accreditation certificate, inspection records, product specification, and surface-treatment evidence. Xinhe Aluminium lists ISO 9001:2015 certification, CNAS laboratory accreditation, Qualicoat certification, and SGS substrate material inspection information.

Can sliding-window specifications support a folding door evaluation?

No. Sliding-window documents may indicate the supplier's general documentation practices, but they do not define a folding door system. A folding-door review requires product-specific details for profiles, hardware, panel arrangement, glazing, rails, opening method, and finishing.

What business documents should be reviewed with technical files?

Buyers should request the formal quotation, minimum order requirement, delivery schedule, payment conditions, packing plan, and shipping arrangement. These records should align with the approved folding door specification and the actual project timeline.

Recommendation

A folding door supplier should be approved only after its certificates, material records, product specifications, inspection procedures, finish documentation, and commercial commitments all correspond to the 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 quality controls covering incoming materials, production-line inspection, and laboratory testing. For technical solutions or further support, contact xh@xinhealuminium.com.

About Us

Guangdong Xinhe Aluminium Co., Ltd manufactures aluminium profiles for architectural, decorative, and industrial uses. 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 production capacity is 200,000 tons, covering window and door profiles, curtain wall systems, decorative profiles, industrial profiles, and customized aluminium extrusions. The company lists an independently recognized CNAS laboratory, ISO 9001:2015 quality management certification, and cooperation with research institutions and universities.