The formula for calculating oil absorption rate of asbestos rubber sheet is as follows: W=(G1-G)*100, in which W=sample oil absorption rate; G1=weight before sample impregnation medium; G=weight after sample impregnation medium, in G. Oil-resistant asbestos rubber sheet is a kind of commonly used heat preservation and sealing material. Generally, we divide it into two types: industrial rubber sheet and aeronautical rubber sheet. The letters can be marked as four types. Let's know about them.
NY150 is a kind of oil-resistant asbestos rubber sheet. Its applicable conditions are higher temperature 150 Celsius and higher pressure 1.5 MPa. This kind of sheet is grey-white. It is generally used for sealing of oil refining equipment, pipelines, automobiles, tractors, diesel engines and oil transportation pipelines. The sealing effect is good. NY250 is two kinds of plate, its higher applicable temperature is 250 degrees Celsius, higher pressure is 2.5 MPa, the appearance of light blue NY250 plate, generally used for oil refining equipment and pipeline flange joint sealing work.
Blue asbestos, which belongs to amphibole-like asbestos, is mainly composed of silicate containing 2.5-3.5% crystalline water. Magnesium oxide in this material is very little, but iron oxide accounts for 18-24%. Compared with chrysotile, blue asbestos not only has good heat resistance, but also has good acid resistance, so it is mostly used to make acid-resistant asbestos rubber sheets. Another is NY400, which has a higher applicable temperature of 400 degrees Celsius, a higher pressure of 4 MPa, and graphite-colored plates. It plays an important role in sealing hot oil, petroleum cracking, coal distillation equipment and pipeline flange connections, and has received much attention. Then one is HNY300, which has a higher applicable temperature of 300 degrees Celsius and green plates. It is mainly used for sealing aviation fuel, oil-based lubricants and air-conditioning systems.
As a good sealing material, asbestos rubber sheet has attracted much attention both in production and performance. Next, the related requirements of rubber sheet selection are briefly introduced. Asbestos rubber sheet is a kind of sealing material, which is also widely used in many machines. The oil absorption rate of asbestos rubber sheet is related to the application of this material. Let's first understand how to test the oil absorption rate of rubber sheet. To test the oil absorption rate of asbestos rubber sheet, the main method is to immerse the sample in the medium prescribed by the product standard, keep the corresponding time at the corresponding temperature, and weigh the change of its weight after taking it out.
As for the performance of asbestos rubber sheet, the quality of asbestos fiber has a great influence on it. This also reminds the manufacturers of rubber sheet that when selecting asbestos fiber, they should pay attention to the selection of materials with high tensile strength, heat resistance and elasticity. At the same time, the fibers also need to have the corresponding length and flexibility. Generally, high-pressure asbestos rubber sheets and oil-resistant rubber sheets over 400 are made of grade 2 and 3 asbestos fibers. Nowadays, due to the increasing restrictions on the use of this kind of rubber sheet, many manufacturers choose to use Sanda asbestos-free rubber sheet instead of the original asbestos sheet.
There are many different types of asbestos rubber sheets pressed with asbestos, rubber and fillers. They are mainly used as sealing materials for pipe flanges, high pressure vessel flanges and various mechanical joints. What are the materials used to make this sheet? What are their respective characteristics?
The main materials used to make asbestos rubber sheets are chrysotile asbestos and blue asbestos (crocidolite). Among them, chrysotile asbestos is a kind of serpentine asbestos, its main component is magnesium silicate containing 13% crystalline water. This material has good heat resistance, alkali resistance, high tensile strength, but poor acid resistance, which is the production material of most rubber sheets.
The test steps are as follows: Cut three pieces of 40mm sample (or circular sample with the same area) and put them in the environment of 98-102 degrees Celsius. Dry them for one hour, then cool them in the dryer for one hour, then weigh them with the balance and record them numerically. Next, put three pieces of sample in a medium container with 10 times the volume of the sample, and in a medium container with 10 times the volume of the sample. Samples are stored at specified temperatures. After being removed from the medium, the media attached to the surface are sucked up with filter paper and immediately placed in a weighing bottle. The weighing is continued with a balance and the values are recorded.
Asbestos rubber sheet is a high quality sealing material. In order to attract customers, many manufacturers offer discount price to order rubber sheet in large quantities. In such activities, what aspects should customers pay attention to?
Although asbestos rubber sheets can be ordered in large quantities and sold at low prices, customers should pay more attention to the quality and performance of rubber sheets. Rubber sheet is used in the sealing of mechanical equipment, which is of vital importance to the operation of equipment. If the quality of rubber sheet ordered is not up to standard, it will cause irreparable losses to equipment and production. Therefore, we recommend that customers wipe their eyes and carefully identify the products of the event organizers to prevent the purchase of inferior products.