First Article, In-Process & Final Inspection for Injection Molding Part

In injection molding part production, quality control is a critical factor to ensure product consistency, dimensional accuracy, and process stability. A well-structured inspection system typically includes first article inspection, in-process inspection, and final (last article) inspection. Each stage plays a key role in maintaining manufacturing quality and reducing defects.

First Article, In-Process & Final Inspection for Injection Molding Part-SHD

First Article Inspection (FAI):

The first article inspection is performed at the beginning of production after machine setup or parameter adjustment. In this stage, a 100% full-dimensional inspection is required. All critical dimensions and specifications of the first produced injection molding part are measured and verified against engineering drawings and customer requirements. Only when the first article is fully approved can mass production begin.

In-Process Inspection:

During production, in-process inspection is conducted regularly to ensure continued stability of the molding process. Typically, inspection is carried out every 2 hours, except for special products or cases where customers specify different requirements. This inspection focuses on key dimensions, appearance quality, and any signs of process variation such as shrinkage, flash, or deformation. The purpose is to detect abnormalities early and prevent mass defects.

Final Article Inspection (Last Article):

At the end of a production run, the last produced injection molding part is inspected and compared directly with the first article. This comparison ensures that the process remains stable throughout the entire production cycle. Any deviation between the first and last article is analyzed to determine whether process parameters remained consistent or require adjustment for future production.

Conclusion:

A structured inspection system combining first article inspection, in-process inspection, and final article verification ensures high product quality and process stability in injection molding manufacturing. It helps manufacturers maintain consistent output, reduce scrap rates, and meet strict customer quality requirements.

For a professional injection molding part manufacturer, implementing strict inspection standards at every production stage is not only a quality control requirement but also a key factor in improving manufacturing efficiency and customer satisfaction. By continuously monitoring process stability and ensuring full traceability from first article to final output, manufacturers can deliver reliable and high-precision molded parts for various industrial applications.

FAQ:

Q1: What is first article inspection?

A: It is the first quality check after setup. All dimensions are checked 100%.

Q2: Why is first article inspection important?

A: It confirms the part meets all drawings. It ensures production can start safely.

Q3: How often is in-process inspection done?

A: It is done every 2 hours during production. Special products may follow different rules.

Q4: What is checked during in-process inspection?

A: Key dimensions and surface quality are checked. Issues like flash or shrinkage are also monitored.

Q5: Why compare last article with first article?

A: It ensures process stability. It confirms no change happened during production.

Why choose SHD?

Over 20 years of Industry expertise
ISO 9001 & ISO 14001
Multi-industry precision mold & molding experience, including automotive, medical devices, water purification systems, 3C, etc., to meet all your requirements.
Years of cooperation with multinational companies & global export experience, ensuring your peace of mind.
Full-chain precision equipment: high-precision CNC, EDM, WEDM, injection molding and measuring machines to meet your highest standards.
Integrated mold & molding solutions streamline your supply chain, delivering final products directly to you.

SHD Precision Injection Mold Supplier