GB 4737-1984 Determination of permeability of daily-use pottery

This standard is applicable to the determination of daily-use coarse pottery, fine pottery and fine pottery products with porosity greater than 3% and less than 30%. GB 4737-1984 Method for determination of permeability of daily-use pottery GB4737-1984 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Test method for permeability of pottery ware of daily use
Staadard test method for permeability of water of pottery ware of daily use UC 666.64:539
GB 4737-84
This standard is used to test the permeability of daily use pottery, glazed pottery and fine ware with a pore size of less than 30%. Definition
The permeability of daily use pottery is the ability of daily use pottery products to penetrate water under a certain pressure. This method is expressed by the time when a sample of a certain thickness begins to penetrate water under a certain water pressure. 2 Equipment and use
2.1 Sampler: G-Tech 200 engineering diamond drill can be selected, with a hole diameter of 50mm. 2.2 Slicer.
2.a Heat-drying box.
2. Permeameter (Figure 1): It is packaged with SS-15 mortar gauge. The water outlet diameter of the measuring egg head is Φ5mm. The inner diameter of the sample die head (Figure 2) is 50mm, and the maximum sea pressure is 15krcm. 5
Figure! Permeameter
Vernier caliper: accuracy is 0.02mm.
2.6Second attack.
2.7Thermometer: t~C
National Standard 1984-11-02 Release
Figure 2 Die head
1985-08-01 Implementation
8Sample preparation
GB4787-B4
3.1 Take the bottom of six back-variety products and drill a cylindrical (sheet) sample with a diameter of 50mm to the upper block. For glazed products, use a flat grinder to grind off the interlayer and the interlayer. For sintered products without glaze, the surface should also be ground off until the surface of the sample is flat. The thickness deviation of the test blocks in the same group is less than 0.5mm for thin-walled products and less than 1mm for thick-walled products. The thickness depends on the product and is generally similar to the thickness of the product. When comparative measurements are required for different products, the thickness of the test blocks should be consistent, but one surface of the product should still be retained (only the glaze layer and the interlayer should be ground off). For large products that are not destructible, a sample should be made, and its thickness should be equal to the bottom of the product. The manufacturing process and conditions should be consistent with those of the product. Half of the sample must be 120gin×30cm, and then a drill is used to take samples and grind the glaze layer. 3.2 Rinse the ground sample with water, dry it in an electric drying oven at 105-110°C, take it out and store it in a desiccator for testing.
4 Determination steps
1 Fill the water container of the permeameter with water and check whether there is leakage in all parts of the instrument. After the instrument is normal, turn on the power switch to make the water pump work until water emerges from the small holes of each measuring head continuously, indicating that the water system is unobstructed. After the gas is driven, use a clean rag to remove the water from the measuring head.
.2 Take the sample to be tested and put it into the sample mold respectively, add a rubber ring (the hole diameter of the gasket is 35mm) or first put a 2mm diameter plasticine strip into the gap between the sample and the inner mold wall, and then separate the ring to seal the gap between the sample and the inner wall of the mold. The sample die head with the sample installed is screwed on the measuring fire of the instrument.
4.3 Rotate the pointer of the electric contact pressure gauge to the required pressure value, turn on the power to make the water pump work, and when the pressure reaches the adjusted value, the pump stops and the pressure is stabilized.
4.4 Close the valves of each measuring head respectively and start the stopwatch at the same time. At this time, the water pump will automatically start due to the pressure drop to maintain the original water pressure.
4.5 When tiny water drops or water marks appear on the surface of the test block, the stopwatches should be closed immediately, and the water pressure value of the test block, the time when penetration begins, and the condition of the test block surface when water penetrates are recorded. 4.6 After the test, turn off the power, open the reading door, drain the water in each pipe, turn the pressure gauge pointer to zero, take out the sample, and wipe off the water marks on the instrument.
5 Test results
5.1 The penetration time is expressed in minutes or seconds.
5.2 The determination of nesting is to take the arithmetic mean of the test blocks of the same level (6). The relative difference between the measured values ​​of each test block should not be greater than 10%. Those with deviations exceeding 10% should be discarded.
5.3 Record and report As shown in Table 1 and Table 2: Original record of permeability determination of daily-use pottery
Chengxiang No.
Sample name
Water absorption
Sample thickness
Penetration pressure
kgf/cm\
Penetration time
Sample surface
Penetration condition
Determination period
Determination person
Sample unit price
Delivery product
Test items
Determination results
Supervisor:
Additional remarks:
Thickness of test block, mm
Determination pressure, kgf/cm*
Penetration interval, GBwwW.bzxz.Net
4737-84
Test report
Sample number
Report number
Report date
Tester:
Order:
This standard was proposed by the Ministry of Light Industry of the People's Republic of China and is under the technical supervision of the Ceramics Research Institute of the Ministry of Light Industry. This standard was drafted by the Jiangsu Ceramics Research Institute. The main drafters of this standard are Zhang Baoyu and Xu Yuyang. 54
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