â‘ Hardness:
Due to the scientific synthesis of high-molecular polyurethane elastomer materials using iron rubber, the higher the hardness, the higher the modulus, the smaller the elongation, and the better the wear resistance and heat resistance. Well, in the range of minus 35 degrees Celsius to 100 degrees Celsius, and at a pressure of 60 to 70 MPa, the maximum sealing performance can be guaranteed.
The use of viscoelastic seals made of nitrile rubber is the most complete protection against damage caused by back pressure. In the range of minus 55 degrees Celsius to 100 degrees Celsius, and under a pressure of 21MPa, due to the rubber The seal is often in a compressed state, so the compression performance of the rubber seal must be considered. It not only achieves enhanced anti-climbing performance and low friction resistance, but also has good performance in dealing with special low-temperature oil, and can also be used in combination with Anti-wear Ring double-purpose retaining ring BRL type.
Sealing products made of polytetrafluoroethylene and nitrile rubber/PTFErubber; or seals made of nylon resin and nitrile rubber, which can be used in a wide range of applications with large pressure changes and fast sliding speeds According to the working condition, the input hydraulic pressure cutout is designed on the end face of the polytetrafluoroethylene ring to prevent penetration leakage. The maximum working temperature environment is minus 40 degrees Celsius to 160 degrees Celsius; the maximum working pressure is 50MPa.
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(1) Mechanical properties Hardness: Diamond is currently the hardest material in nature, with a relative hardness (Mohs hardness) of 10 and a microhardness (square pyramid extrusion method) of 98,588 MPa. Diamond absolute hardness of quartz is 1000 times, 150 times corundum. Diamond has different origins, deposits and colors, and its hardness is different. The hardness of different crystal faces on the same diamond is also different.
Brittleness: Although diamond is very hard, it is brittle and will crack along the crystal cleavage surface under a certain impact force. The brittleness of diamond is related to internal stresses, cracks and other defects of the crystal. The larger the internal stress of the crystal, the crystal with cracks and other defects, can be cleaved under a lower impact.
Density: The density of diamond is generally 3.47~3.56g/cm 3 , and the purity of pure and crystallized diamond is 3.52g/cm 3 . The color of the diamond is different, the type and number of inclusions in the crystal are different, and the density is also different.
Cleavage: Diamond has medium cleavage of parallel (111) faces and incomplete cleavage of parallel (110) and (221) faces.
Fracture: Diamond fractures have a very complex structure, but are often characterized by shells or jagged shapes.
(2) Optical properties Color: Pure diamond is colorless, but relatively rare. Mostly in different colors, such as yellow, green, brown, rose, blue, gray, black, etc. The color of the diamond is related to the impurities and structural defects involved.
Gloss: Diamonds often have diamond luster, but a few are grease luster, glass luster, and even dull. This is due to long-term chemical corrosion, ray effects, intrusion of foreign matter, and coverage of other materials on the surface.
Transparency: Pure diamond crystals are transparent, but some diamonds are translucent and even opaque.
Refractive index: The purity is 2.40~2.48, and the refractive index is the highest in transparent minerals. The higher the refractive index, the stronger the reflection force on light. The specially designed and processed diamonds reflect almost all of the light incident on the surface and into the interior.
Dispersion: Diamond has a high degree of dispersion and a dispersion coefficient of 0.063, which is also the largest among transparent minerals. The larger the dispersion coefficient, the better the spectroscopic effect. When a white light is injected into the honed diamond, it can be divided into different colors due to the dispersion effect, making the diamond dazzling.
Abnormal interference color: The interference color of equiaxed crystal minerals under crossed polarizers should be black, but many diamonds have abnormal interference colors such as gray, yellow, pink, and brown.
Luminescence: Diamond emits bright green, sky blue, and blue fluorescence under cathode rays; medium-brightness or weaker sky-blue fluorescence under X-ray; sky blue, purple, and yellow with bright or medium brightness under ultraviolet light green fluorescence; after sun exposure in a dark room hair cyan blue phosphors.
(3) Thermal properties [next]
Thermal conductivity: Diamond is a good thermal conductor with a thermal conductivity ranging from 138.16 W/(mK). Type IIa diamond has particularly good thermal conductivity, 25 times that of copper at liquid nitrogen temperature and 5 times that of copper at room temperature, and has superconductivity.
Thermal expansion: The coefficient of linear expansion of diamond is extremely small at low temperatures, and the linear expansion coefficient increases rapidly with increasing temperature.
Heat resistance: The ignition point of diamond in pure oxygen is 720~800 °C, the ignition point in air is 850~1000 °C, and it is converted into graphite in pure oxygen at 2000~3000 °C. The flame is blue when the diamond burns.
(4) Magnetoelectric properties Magnetic: Pure diamond is non-magnetic and has some magnetic properties when it contains magnetic inclusions.
Conductivity: In general, diamond is a poor conductor of electricity, and its electrical conductivity is small, 0.211×10 -14 ~0.309×
10 -13 S/m. As the temperature increases, the conductivity increases. Type 2b diamond has good semiconductor properties.
Photoconductivity: When the diamond was irradiated with ultraviolet light having a wavelength of 2100 × 10 -7 to 3000 × 10 -7 mm, a photocurrent was found in the diamond. When irradiated with infrared rays and ultraviolet rays simultaneously, the photocurrent is increased by nearly 2 times. In the same situation, the photocurrent of type II diamond is several orders of magnitude larger than that of type I diamond.
Dielectric constant: The relative dielectric constant of diamond is 16 to 16.5 at 15 ° C. The data varies with the electric field strength, frequency and room temperature at the time of measurement.
Triboelectricity: The frictional charge is generated when the diamond rubs against the surface of glass, hard rubber or plexiglass. The sign of the triboelectric charge is positive and the size varies with the friction time. When the rubbing time is 60 s, the triboelectric charge is about +3 × 10 -9 ~ 10 × 10 -9 C.
(5) Surface properties The diamond surface has strong lipophilicity and its fresh surface wetting contact angle is 80~120°. The surface of the diamond in nature is often contaminated and the wetted tentacles become smaller.
(6) Chemical properties Diamond has good chemical stability, acid and alkali resistance, and does not react with concentrated HF, HCI and HNO 3 at high temperatures. The surface is only slightly oxidized when it is boiled in a melt of NaCO 3 , KNO 3 or with a mixture of K 2 Cr 2 O 7 and H 2 SO 4 .
2. Main use
The main uses of diamonds can be divided into two aspects of decorative and industrial use, which are described as follows:
The quality of the diamond used for decoration is very high. The crystal form is required to be complete, colorless or colorful, high transparency, no cracks and impurities. Generally, the larger the crystal, the higher the value. The lighter the color, the higher the value. For colored diamonds, the darker the color, the higher the value. [next]
Industrial diamond: For type I diamond, it mainly uses its high hardness and high wear resistance. For type II diamond, it mainly uses its good thermal conductivity and semiconductor properties. The main uses of industrial diamonds are listed below. 
SPGW piston seal
Material:PTFE+rubber elastomer+reinforced modified nylon
Temperature:Nitrile rubber -40~100℃
Speed:=1.0m/s
Pressure:≤50mpa
SPGO piston seal
Material:PTFE+rubber elastomer
Temperature:Nitrile rubber -40~110℃
Speed:=1.0m/s
Pressure:≤35mpa
SRUV piston rod seal
Material:NBR+thermoplastic polyurethane
Temperature: -35`90℃
Speed:=0.5m/s
Pressure:≤40mpa
SRS piston rod seal
Material:PTFE+NBR
Temperature:-40~110℃
Speed:=1.0m/s
Pressure:≤40mpa
SRCB piston rod buffer seal
Material:Polyurethane+modified polyoxymethylene
Temperature: -35~110℃
Speed:=1.0m/s
Pressure:≤50mpa
SRU piston rod seal
Material:Polyurethane
Temperature:-35~100℃
Speed:=1.0m/s
Pressure:≤40mpa
SRD iron case dust prevention
Material:Polyurethane+metal skeleton material
Temperature:-40~110℃
Speed:=1.0m/s
SRDI soft dustproof
Material:polyurethane
Temperature:-40~110℃
Speed:=1.0m/
SDS Dumbbell Seal
Material:polyurethane
Temperature: -35~110℃
Speed:=0.5m/s
Pressure:≤50mpa
SPG piston combination seal
Temperature:
NBR+Polyurethane + Modified Polyoxymethylene
Temperature:-35`110℃
Speed:=0.3m/s
Pressure:≤70mpa
SRNL piston rod seal
Material
NBR+Polyurethane + Modified Polyoxymethylene
Temperature:-35`110℃
Speed:=0.3m/s
Pressure:≤70mpa
SRDF Piston Rod Seal
Material
Polyester rubber
Temperature:-40`100℃
Speed:=1.0m/s
SDY Y-seal
Material:Polyurethane
Temperature:-35~110℃
Speed:=0.5m/s
Pressure:≤70mpa
KZT anti fouling ring
SDS Steffel
Piston main oil seal
Process characteristics