There are many types of tiles on the market, but the quality is also uneven. Ordinary consumers lack an understanding of the knowledge of ceramic tiles, and it is easy to choose inferior products with a little carelessness. Today, let's take a look at the method of tile purchase. First, check the label The product packaging box shall have the name of the factory, the address of the factory, the name of the product, the telephone number of the after-sales service, the specifications, the quantity, the trademark, the date of manufacture and the standards implemented. For the porcelain bricks, the CCC certification mark, the interior decoration and decoration of the tiles shall be inspected. Products with radionuclides that meet Class A requirements should be selected. Second, look at the appearance The glazed tile of good quality should be smooth and delicate, the gloss glaze is bright and radiant, and the matt glaze is soft and comfortable. Under sufficient natural light or fluorescent lighting, the bricks should be placed vertically at a distance of 1 m and no obvious glazed defects should be visible. The pattern of the pattern of bricks should be delicate and realistic, without obvious defects such as lack of color, broken lines and misalignment. The shading and trademark of the back of the high quality ceramic products are clear and complete, with little glaze or defects. Third, the stitching effect Good ceramic tile size deviation is small, put a batch of products vertically on a plane to see if there is any jagged phenomenon. Looking at the level of flatness, the edges of the two bricks can be pressed together to see if there are any gaps. Good product deformation is small, and the brick surface is flat and beautiful after paving. Look at the color difference of the product, put a few pieces of brick together and carefully look at the light, the products with different shades between the products, the overall effect is poor after the paving. Fourth, tap listening Gently tap the tile to listen to its sound, and the better quality product sounds crisp and sweet. Poor quality products are due to improper formulation of raw materials, short firing cycle, low firing temperature, and an “empty†sound when struck. Five, the amount of weight The weight of a tile, in general, the same size of the tile, the weight of the water absorption is low, the internal quality is also good. Sixth, comparative varieties According to the glazed condition, the floor tiles are divided into glazed floor tiles and unglazed floor tiles. Glazed floor tiles are mainly used for floor decoration of bathrooms and kitchens, and are used together with interior wall tiles. Most of the floor tiles are polished to a polished surface. Most polished tiles have a water absorption of less than 0.1%, also known as vitrified tiles. The polished surface of the polished brick is a high-grade ceramic product. Seven, tile corners When paving tiles, many consumers and workers have encountered difficulties in aligning the corners. This means that the flatness of the tiles may not be too close. When selecting tiles, randomly select a few pieces and use the gaze along the edges of the tiles. And the diagonal lines are measured separately. If there is a phenomenon of “warping edgeâ€, it means that the flatness of the tile is not enough. If not, it means that the flatness of the tile is basically passed, which is also a small trick to buy tiles. [Follow the WeChat public number "Jiuzheng Ceramics Network" ; pay attention to surprises, scan the code to read "a leader of beautiful female employees!" Too classic! 》The wonderful content! Jiuzheng Ceramics Network Exchange Group: 80123558 】 The commonly used Pipette kits are mainly composed of a pipette and a pipette tip. The pipette tip is a single empty 1000 ul pipette tips,200ul pipette tips,10ul pipette tips,low retention pipette tips Yong Yue Medical Technology(Kunshan) Co.,Ltd , https://www.yonyue.com
Cavity reservoir; the pipette uses the principle of air displacement and controls the maximum displacement of the piston by rotating a screw with an ultra-fine thread
displacement, and then control the amount of liquid suction. There are the following problems when using the above kit for suction: 1. The suction volume is controlled by the pipette
After the pipette is sterilized or used for a period of time, it is easy to cause "hidden" failures, which cause the operator to be difficult to detect.
The actual suction volume is inaccurate, and it needs to be adjusted frequently, and the operation is cumbersome and time-consuming; 2. To improve the pipetting accuracy, the operator's
The operation requirements are high, and it is easily affected by factors such as the suction speed, the depth of the tip below the liquid level, and the inclination angle of the pipette.
The actual suction volume will be heard; 3. The actual suction volume will be affected because the suction head cover is not tight and leaking, and it will not be easily detected; 4.
When performing experiments that require high accuracy, such as analysis, in the operation of equal volume aspiration of liquids with different densities, the actual
The actual suction volume will be affected by the density itself; 5. In order to improve the accuracy, this type of pipette needs to carry out high
Cost-optimized design results in extremely high pipette costs.
Tiles are purchased without the help of seven tips to help