Quality review / documentation / manufacturer identity

Quality support for your application.

Review color, resin compatibility, processing conditions and the documentation needed for your application. Explore our production and testing references, and contact us for a project-specific document review.

Supplier documentation

Our family-owned companies.

Xinfeng and Yunqiang are both owned by our family. Sinfone is the export-facing brand of Yuyao Xinfeng Plastic Chemical Co., Ltd. (Xinfeng).

The business license displayed here belongs to 宁波允强高分子材料有限公司 (Yunqiang).

Documents for your supplier review

Tell us which company, product grade and application your purchasing review needs to cover. We will review the request and confirm which documents are available for that scope.

Request supplier documents

Business license of 宁波允强高分子材料有限公司 (Yunqiang) — Business license: 宁波允强高分子材料有限公司 (Yunqiang), a company owned by the same family as Xinfeng. Select the image to enlarge it.

Factory visibility

Factory, equipment, and testing visuals from the operating business.

Explore the warehouse, production equipment and laboratory instruments used by our business in Yuyao, China.

Warehouse and inventory

Bagged masterbatch inventory at the Yuyao manufacturing base.

Production equipment

Mixing and compounding equipment for masterbatch production.

Testing support

Laboratory and testing instruments shown in company materials.

The company profile references tools such as a six-light source color assessment cabinet, melt flow indexer, colorimeter, aging tester, injection molding equipment for color matching, film-blowing equipment for dispersion review, impact testing, and analytical balance support.

Testing instruments and laboratory equipment — Testing instruments shown in company materials, including color assessment, melt flow, aging, dispersion testing, and related quality-control equipment.

Third-party report support

Relevant certificates, third-party reports, and supporting documents can be provided when they match the product or project under discussion.

Testing and quality control

Review the color reference, resin, processing conditions and acceptance criteria with us before approving a grade or sample for production.

Direct review process

Initial qualification still goes through direct review, sample discussion, and project-specific response.

Additional references

Other places where buyers can cross-check us.

These references are supplementary proof, not replacements for project-specific documents. Both are Chinese-language pages, so overseas buyers can use browser translation when needed.

Chinese plastics platform

21cp company profile

A Chinese-language company profile on 21cp, a well-known plastics-industry platform in China. It gives buyers another place to cross-check business identity and product presence.

Open 21cp profile

Chinese domestic storefront

Taobao store reference

A Chinese-language domestic storefront with additional product images and reference listings. It can be viewed with browser translation for additional company and product information.

Open Taobao store