A Comprehensive Analysis of Inspection and Certification Standards for Stainless Steel Tableware

Stainless steel is one of the most commonly used materials for tableware such as knives and cooking POTS. To ensure that product quality meets market access requirements, inspectors, purchasers and manufacturers need to master the following inspection and certification standards. This article systematically sorts out the key points of testing stainless steel tableware from aspects such as appearance, hardness, impact resistance, thermal deformation resistance, water seepage resistance, and corrosion resistance.

I. Appearance Inspection (Basic Inspection)
During the inspection process, the following appearance indicators should be checked item by item:

Blade placement: Unless specially designed, the blades of the table knife must not come into contact with the placement surface.

Fit clearance: The clearance between the product's hardware and assembly accessories should be ≤0.2mm.

Cutting edge requirements: The cutting edge is generally wedge-shaped or toothed, or the wrap Angle is ≤7°. The thickness at a distance of 1mm from the cutting edge is ≤0.46mm.

Dimensional tolerance: The actual size should not exceed the nominal size by an error of +2%.

Defects and indentations:

Under normal circumstances, the surface is not allowed to have defect points or indentations with a diameter of ∅ > 0.3mm.

Within an area of 10cm², partial defects are acceptable: no more than 2 for high-end products and no more than 3 for ordinary products.

Visual inspection is the first step in goods inspection and also an important basis for evaluating the factory's technological level during factory inspection.

Ii. Hardness Testing (Material Property Inspection)
Test point position: More than 4cm away from the handle. Take the average of the front, middle and back points as the final hardness value.

Hardness directly affects the sharpness retention and durability of cutting tools and is an important mechanical index in certification.

Iii. Impact Resistance Test of Half Handle (Reliability Inspection)
Method: Drop the product freely from a height of 1.2 meters five times.

Judgment: If there is no damage, the impact resistance performance is qualified.

This test simulates accidental drops during use and is one of the items for product reliability certification.

Iv. Heat Deformation Test of Half Handle (Temperature Resistance Performance Inspection)
For regular products: Immerse the entire meal/knife in 55℃ water for 30 minutes.

High-end products: Immerse the entire meal/knife in water at 80℃ for 30 minutes.

Judgment: There is no obvious deformation of the handle, and the gap between the hardware handles is ≤0.35mm.

Heat distortion testing is a key inspection for evaluating the stability of tableware during actual use, such as high-temperature disinfection and contact with hot food.

V. Hollow Handle Water Resistance Test (Sealing Performance Inspection)
Method: Immerse the meal/knife in hot water above 95℃ for 10 minutes.

Judgment: It is qualified if there is no water seepage at the handle and welding points.

This inspection is aimed at the hollow handle structure to prevent water from entering during use, which could cause corrosion or hygiene issues. It is also a verification point for the welding process during the factory inspection.

Vi. Corrosion Resistance Test (Chemical Property Inspection and Certification)
Test method

Rinse the blade clean with hot soapy water and remove the stains with alcohol.

Place it in an unsealed salt water bottle (1% NaCl solution, at a constant temperature of 60±2℃).

Immerse the blade into the solution 2 to 3 times per minute.

High-end cutting tools are tested for 6 hours, while ordinary cutting tools are tested for 3 hours.

Determination method:

After the test, first wipe the surface rust spots clean with a soft cloth and polish, or wash and dry with 20% nitric acid and distilled water in a ratio of 1:2.

Qualification standard

Handle area: Pockmarks ∅0.4-0.75mm, no more than 5.

Blade position: Pockmarks ∅ < 0.4mm, no more than 6.

No pockmarks with diameters greater than 0.75mm are allowed on any part.

Crack: Longitudinal crack length less than 1.5mm is acceptable. Transverse cracks are not accepted under any circumstances.

Corrosion resistance testing is a mandatory item in food contact material certification (such as LFGB, FDA), which is directly related to the service life of the product and food safety.

Vii. Association between Factory Audit and Certification
Supplier factory inspection: It is necessary to verify the raw material procurement (stainless steel grades), stamping, welding, polishing, assembly and other processes of the stainless steel tableware manufacturing enterprise. Calibration records of testing equipment (hardness testers, salt spray chambers, vernier calipers, etc.); Qualifications of inspection personnel; And the process for handling non-conforming products.

Product certification: Exported tableware must comply with the certification standards of the target market (such as EU LFGB, US FDA, China GB 4806, etc.). When inspecting the goods, check the consistency between the product labels, instructions and certifications.

Continuous improvement: For non-conformities identified during inspection (such as excessive fit clearance and excessive corrosion pitting), a rectification report should be formed, followed up through factory inspection to form a closed loop, and a quality traceability file should be established.

Through the above inspection, testing, factory inspection and certification processes, it can be ensured that stainless steel tableware fully meets the standards in terms of dimensional accuracy, mechanical strength, temperature and corrosion resistance, hygiene and safety, etc., and meets the market access requirements at home and abroad. Welcome to save this guide. If you need professional inspection services, please make sure to recognize a qualified third-party inspection and certification institution.

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