Standard Procedures for Daily Ceramic Inspection

Standard Procedures for Daily Ceramic Inspection


1. Appearance: Appearance inspection is performed on each sample taken.

2. Lead and cadmium: If the foreign trade contract or the government of the importing country has provisions on the amount of lead and cadmium dissolution, the inspection shall be conducted in accordance with the prescribed standards and methods; if there is no regulation, the inspection shall be conducted in accordance with China’s national standards.

3. Physical properties: Foreign trade contracts that have provisions on physical performance inspections shall be inspected in accordance with regulations; if there are no regulations, random inspections may be conducted in accordance with China’s national standards.

4. Packaging: At the same time as sampling, the internal and external packaging should be inspected. Packaging should meet the requirements of firmness, dryness, cleanness, integrity, and long-distance transportation.


The export ceramics failed the first inspection, and the inspector was allowed to re-inspect and re-inspect to the origin inspection and quarantine institution after rework. After rework, the re-inspection shall be accompanied by a rework report, but rework is allowed only once.

The export ceramics for daily use is valid for one year.


1. Inspection of the bearing capacity of the handle and mouth

Hollow products, such as cups, pots, cans, etc., are mostly used to hold food, and these products have external parts such as handles and mouths that can be used to lift items to move. Personal injury may occur when heating food.

The handle and mouth endurance test can simulate the process of lifting and moving food, such as adding a certain amount of wet quartz sand or iron balls in a cup, pot, can, etc. to check the handle and mouth endurance.

2.Surface scratch inspection

During the use of ceramic products, the use of knives and forks (two meals) with each other can cause scratches on the surface and affect the appearance.

The occurrence of scratches has a lot to do with the surface hardness of the glaze. The data obtained by the Vickers hardness standard inspection method are different from the actual use. Therefore, some companies now use Mohs hardness, metal knife, fork scratch Check by rubbing or rubbing with sandpaper.

A. Mohs hardness: use standard Mohs rock hardness blocks (10, 15 or more) to scratch the surface of ceramic products, determine the level of rock that can leave scratches on the ceramic glaze, report Its rank.

B. Scratches on metal knives and forks: Use metal knives and forks to scratch on ceramic products, and check whether there are scratches on the surface of the products.

C. Sandpaper friction: When a certain fineness of sandpaper is used to apply a certain force on the surface of the ceramic product, it is rubbed back and forth a specified number of times. After washing, it is coated with a dye and checked for abrasion.

3.Dishwasher-resistant inspection

For the dishwasher resistance test, the ability to resist acidic, alkaline, and neutral detergents during the dishwasher washing process is mainly tested.

For ceramic products, a certain number of washing cycles (such as 750 cycles on the glaze and 1000 cycles in the glaze (bottom)) are specified for the on-glaze decorative product and the middle (lower) decorative product, respectively, in acidic and alkaline Under neutral washing condition, complete the test to check the effect on the decorative surface and glazed surface.

4, Microwave oven test

Microwave resistance test can be divided into three kinds of tests:

A. Microwave inspection of decorative surface.

Put the ceramic with decorative pattern into a microwave oven (typically microwave power is 1000W), and work at full load for 5 minutes to check whether the decorative surface is damaged.

B. Examination of the influence of microwave on the surface temperature of the product.

Place the ceramic product in a microwave oven and work at full load for 5 minutes. Use a surface thermometer to measure the surface temperature of the product.

Ceramic products can be left in water for a period of time, and then the surface moisture is dried for testing, especially for products with large water absorption, such treatment should be performed first.

C. Microwave inspection of product damage.

Microwave inspection of ceramic products can be divided into two types.

(1) Put a sponge saturated with water into the ceramic product, cover it with a cover or a film, keep it at 4 Celsius for 24 hours, put it in a microwave oven for 5 minutes at full load, cool to room temperature, and cycle it for a certain period The number of times, check the damage of the sample.

(2) Put the ceramic products in the frozen condition for 16 hours, put them in a microwave oven and work at full load for 10 minutes, and check the sample for damage.


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