Comparison of Sample Inspection and Full Inspection丨Third Party Inspection Company

In product quality control, the third partyinspection companyThe core tests often provided -random testtogether withfull analysisThe two have significant differences in application scenarios, implementation processes, and cost-effectiveness. There are significant differences between the two in terms of application scenarios, implementation processes, cost-effectiveness, etc. A precise understanding of these differences will help customers choose a more suitable one according to their needsinspection of goodsWay.

Sampling test is to randomly select a certain number of samples from the whole batch of products for testing, based on the sample test results to infer the product quality of the whole batch of inspection methods. Its principle is based on mathematical statistics, through scientific sampling program design, at a certain confidence level, to assess the overall quality of the sample characteristics. For example, when the inspection of a large number of screws, 200 randomly selected for size, strength and other indicators of the test, according to the test results of these 200 screws, to determine whether the entire batch of screws qualified.

Full inspection is the inspection of each product in the inspection lot to determine whether each product meets the quality standards. In the production of precision instruments, electronic products, chips and other products with extremely high quality requirements, companies usually use the full number of inspection to ensure that each product can meet the strict quality standards.

1. High-volume products: When a huge number of products, such as daily necessities, textiles and other mass-produced goods, full inspection is time-consuming and labor-intensive, sampling inspection can significantly improve inspection efficiency. To a large garment factory monthly production of 100,000 pieces of T-shirts, for example, if the full number of inspections, the need to invest a lot of manpower and time, and sampling inspection can be completed in a short period of time, and can effectively control the quality risk.

2. Destructive testing: For some products, the inspection process will cause damage to the product, such as the taste test of food, the strength of metal materials destructive test, etc., can only be used to sample inspection. Because if the full number of tests, the product will be completely destroyed and lose its use value.

3. Higher inspection costs: When the inspection of the equipment required, manpower, time costs are too high, sampling inspection is a more economical choice. For example, complex performance testing of high-end electronic products, if the full inspection, the cost will increase significantly, sampling inspection can be to ensure the accuracy of certain quality judgment under the premise of reducing costs.

1. Critical, important products: products involving personal safety and significant functions, such as automotive airbags, medical devices, aerospace components, etc., must use the full number of inspections to ensure zero defects. Because once these products have quality problems, it may cause serious consequences.

2. Small batch products: When the number of products is small, it is relatively inexpensive to carry out full inspection, and can fully grasp the quality status of each product. For example, customized high-end furniture, due to limited quantities, full inspection can better meet the high quality requirements of customers.

3. Unstable quality products: for the production process of quality fluctuations in the product, the full number of inspections can help to detect problems in a timely manner, to find out the reasons for quality instability, so as to take measures to improve the production process.

1. vantage

• High efficiency: no need to test all the products, greatly reducing the inspection time, can quickly give the test results to meet the needs of enterprises to ship quickly.

• Low cost: Reduced investment in manpower, material resources and time, reducing the cost of inspection. Especially for large quantities of products, the cost advantage is more obvious.

• Operational: through the scientific sampling program, can to a certain extent to ensure the reliability of the test results, and the operation is relatively simple.

2. drawbacks

• There is a risk of misclassification: Since the total is inferred from the sample, the sample may not be fully representative of the total, and there is a risk of misclassifying an eligible lot as an ineligible lot (a truth-discarding error) or an ineligible lot as an eligible lot (a falsification error).

• Inability to capture individual quality: Only the quality of the entire batch can be known, and a detailed assessment of the quality of each product is not possible.

1. vantage

• Accurate quality control: inspection of each product, can accurately grasp the quality of each product, to ensure that product quality meets the standards, and effectively avoid unqualified products into the market.

• Comprehensive information: You can obtain quality data of all products, which provides a comprehensive basis for enterprises to improve the production process and product quality.

2. drawbacks

• High cost: It requires a large amount of labor, material resources and time, and the inspection cost is high. For large quantities of products, it may lead to a significant increase in the cost of the enterprise, affecting economic efficiency.

• Low efficiency: the inspection process is cumbersome and time-consuming, which may affect the product delivery cycle and reduce the market competitiveness of the enterprise.

• May cause product damage: In the inspection process, frequent operations may cause some damage to the product, especially for some precision products.

Third-party inspection company in practice, the need to take into account customer needs, product characteristics, cost budget and other factors, flexible choice of inspection methods.

1. Full communication of customer needs: before the inspection, in-depth communication with the customer to understand the customer's product quality requirements, shipping time, cost budget and other information. If the customer's product quality requirements are very high, and do not mind higher inspection costs and longer inspection time, you can prioritize the full number of inspections; if the customer is more focused on inspection efficiency and cost control, sampling inspection is more appropriate.

2. Evaluation of product characteristics: according to the type of product, use, production process and other characteristics of the choice of inspection methods. For high-risk, critical products, such as medical devices, automotive parts and components, etc., should be used in full inspection; for large quantities, non-critical products, such as ordinary stationery, plastic products, etc., sampling inspection can meet the needs.

3. Combined with the enterprise's own capabilities: consider the company's manpower, equipment, technology and other resources, choose a way to efficiently complete the inspection task. If the company has advanced inspection equipment and adequate professional inspectors, under the premise of meeting customer needs, can be appropriately expanded to the full range of inspection; if the resources are limited, it should give full play to the advantages of sampling inspection.

Sample inspection and full inspection have their own characteristics and scope of application. Third-party inspection company needs to be based on the actual situation, weigh the pros and cons, choose the most appropriate inspection method, to provide customers with professional and reliable!inspection serviceIn order to ensure the quality of products and maintain the market order.