The Ultimate Guide To Product Quality Inspection

When you are in the market to sell a product, the first thing you need to consider is whether the quality of the product you are selling is up to standard. If your products are easily damaged after purchase, it will be a bad shopping experience for consumers, and product quality testing can help you avoid this risk.

In this article, the definition, steps, and types of product quality checks will be introduced.

What Is Product Quality Inspection?

Product quality inspection is a procedure that involves checking various attributes of a product and testing it to ensure that it meets pre-defined standards. Product quality inspection can be performed by the factory’s quality control team, the purchaser, or a third-party inspection company.

What Are the Steps of Product Quality Inspection?

Taking Random Samples

The quality inspector goes to the factory and conducts random sampling inspections according to the AQL sampling method.

Checking According To the Quality Checklist

Once the samples are taken, they are inspected based on the items on your checklist, including checking product packaging labels, etc.

Sending Inspection Report

After completing the quality inspection, send the inspection report, which will tell you whether your goods have passed the inspection or not.

What Are the 4 Types of Quality Inspection?

This guide describes the four most basic forms of inspection: pre-production inspection, in-production inspection, pre-shipment inspection, and container handling inspection. Each type of inspection is important in quality control and supply chain management, and you need to choose the type of inspection that fits your business needs based on the product, your experience working with suppliers, and other factors.

Pre-Production Inspection (PPI)

Pre-production inspection (PPI) is an inspection performed prior to the product manufacturing process that helps assess the quantity and quality of raw materials to ensure they meet product specifications. When you are working with a new supplier, PPI inspections help ensure that your production gets off to a good start and can help you identify quality problems with your products in a timely manner, preventing delays in the mass production of problematic products.

Pros

  • Ensure production is on schedule
  • Ensure that product materials meet your requirements
  • Prevent additional costs from being incurred later
  • Reduce the risk of supply chain disruptions
  • Work with a manufacturer that can meet your needs

Cons

  • Supplier backlash

Some factories may refuse to perform pre-production inspections to prevent disruptions to their production lines.

  • Quality varies

The product coming off the initial line does not reflect your overall production quality.

  • Inspection lags

Long production cycles for your products force inspectors to wait longer to get a sample of your finished product for inspection.

During Production Inspection (DPI)

Production During Inspection (DPI), is a quality check that is performed during the production process. Usually, when your shipment is 10-15% complete, products are randomly selected from the production line and compared to your product specifications. This allows you to identify quality defects in your products as soon as possible and rework them on-site to avoid causing delays.

It allows you to maintain product specifications and quality throughout the production process. It also enables early detection of any problems that need to be corrected, a step that is particularly useful for products that are produced continuously and have stringent requirements and/or where quality problems have been identified during the early PPI prior to production.

Pros

  • The production runs according to the schedule
  • Prevent unnecessary extra costs
  • Ensure factories follow your product specifications
  • Identifies possible delays
  • Corrective actions can be taken before production ends

Cons

  • Requires experienced inspectors
  • Higher cost

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Container Loading Check(CLC)

Once production is complete, your goods are loaded into containers ready for shipment. A container loading inspection is performed prior to shipping, a process that includes assessing the condition of the shipping container and verifying that all product information, quantities, and packaging meet your requirements.

Pros

  • Cargo is loaded correctly
  • Damage during the transportation is prevented

Cons

  • Inspection is rushed
  • Rarely checked by random sampling
  • Cannot determine the overall quality of your cargo

Pre-shipment inspections (PSI)

Pre-Shipment Inspection (PSI), also known as Final Random Inspection (FRI), is a method of checking the quality of a shipment before it is shipped and is an important step in the quality control process. This inspection process is performed when 100% of the product has been produced and 80% of the goods have been packed. Random samples are taken and checked for defects according to relevant standards and procedures to ensure that the production meets the buyer’s specifications.

Pros

  • Ensure that your goods are packed, marked, documented, and inspected prior to loading and shipping.
  • Ensures product quality meets requirements (product specifications, dimensions, labelling, packaging, and quantity can be monitored)
  • Can be tested on-site while the goods are being inspected
  • Payment and shipment can be authorized after the goods have passed inspection

Cons

  • Samples are randomly selected and do not reflect the overall quality
  • Quality inspectors may be bribed
  • Inspection time is rushed

Why Need To Create an Inspection Checklist?

Often, each manufacturer has specific requirements for its products. That’s why the quality control department must customize a quality control checklist to meet the unique needs of your employer. A QC checklist is a written guide to your product’s packaging, colours, bar codes, appearance, features, and special requirements; it is sometimes referred to as an “inspection criteria sheet” or checklist. The quality checklist mainly includes product requirements, packaging requirements, field product testing, and defect classification. With a quality inspection checklist, the efficiency of inspecting goods can be improved.

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