ASA is a terpolymer composed of acrylonitrile, styrene and acrylate rubber, which was successfully developed in 1970s and belongs to impact modified resin.
ASA is the main product of GE Plastics, a subsidiary of General Electric (GE). In August, 2002, ASA, as a raw material for * * * extrusion, was introduced into the pvc color * * * extrusion profile market in China with the registered trademark of Geloy.
ASA plastic raw materials
Advantages of ASA
1 and ASA have good mechanical and physical properties.
ASA and ABS are similar in structure, consisting of acrylonitrile and butadiene rubber, and retain the excellent mechanical and physical properties of ABS as an engineering plastic.
2.ASA has strong weather resistance.
If the polymer contains double bonds, the double bonds are easily opened by ultraviolet rays in high-energy sunlight, which leads to the decline of the aging resistance of the polymer. ASA uses acrylic rubber without unsaturated double bonds instead of butadiene rubber with unsaturated double bonds in ABS, which can not only resist degradation, aging and fading caused by ultraviolet radiation, but also provide a strong guarantee for decomposition or discoloration caused by high temperature during oxidation in the atmosphere, thus greatly improving the aging resistance and weather resistance of materials. According to the test results, the anti-aging performance of ASA is more than 10 times that of ABS.
3.ASA has good high temperature resistance.
4.ASA is an antistatic material, which can make the surface less dusty.
Application field of ASA
Automotive field: ASA will not turn gray after long-term wind erosion (due to wind erosion or water flow, there are many micro-cracks and cavitation on the surface) like specially treated anti-aging ABS. Typical applications of ASA are external components, such as external rearview mirrors, radiator grilles, tail baffles, lampshades, etc. They will be affected by harsh conditions, such as sun, rain and strong winds. It has gradually extended to motorcycle panels, campers, small hulls, surfboards and other fields.
Horticultural field: ASA has been proved to be particularly suitable for horticultural irrigation equipment and lawn cutting machine housings.
Electronic and electrical field: it is preferentially used for the casings of durable equipment, such as sewing machines, telephones, kitchen equipment, satellite antennas and other all-weather casings.
Building field: ASA/PVC admixture is used as roof panel and window material. In this respect, 10 years of practical application experience has been gained abroad.
In the United States, ASA has been widely used in advanced bathrooms and sanitary products, hot and cold water exchangers and so on. Because of its good surface quality and long-lasting and stable color, ASA also has corrosion resistance to detergents and disinfectants. In the field of photography, ASA stands for sensitivity, which is an American standard. We can simply think that ASA is equivalent to ISO.
Sensitivity is the speed of film exposure and one of the factors that determine photographic exposure. In the past, countries around the world expressed sensitivity in different ways and formed different systems. There are two widely used products, one is customized by DIN in Germany, and the other is ASA system in the United States. In fact, ASA system and DIN system are unified. For example, ISO 100/2 1 corresponds to ASA 100 or DIN 2 1. One of the proof methods of triangle congruence: two triangles with equal corresponding angles and congruent sides.
A is the angle and s is the edge. The abbreviation "asa" or "Corner and Corner”ASA is a global application file of ASP. It mainly defines the Session object and the Application object, and the corresponding events.
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Both the object and the application object have two events. To use their events, you must first use the. Asa file, invisible to users, has a fixed file name. Moreover, the file must be placed in the root directory of the application, and each application can only have one. Asa file.
This file must be saved as. Asa and put it in the root directory. If you don't want to use the events in the Session object and the Application object, you don't have to use this file.
Because of the mechanism, mdb files are easily downloaded by others, so in order to prevent others from downloading mdb databases, many people like to change mdb format database files into asa format. After changing asa to mdb, you can still open it with ms access. However, this is only self-deception, because asa is as easy to download as mdb format for network experts. ASA is the largest and most efficient microfinance financial institution in the world, with more than 3,000 branches in North America, Europe, Asia and Africa, more than 24,000 employees and more than 600 million customers, ranking first in Forbes' list of global microfinance institutions.
The Group has not yet launched corporate business in Chinese mainland, but with advanced management technology and rich operational experience, it has played an important role in UNDP projects such as Sichuan Yilong County Rural Development Association and Inner Mongolia Chifeng Zhaowuda Women's Sustainable Development Association, and made outstanding contributions to promoting the development of microfinance and rural poverty alleviation in Chinese mainland. C (vitamin C (ascorbic acid), also called L- ascorbic acid, is a water-soluble vitamin.
American Association of Anesthesiologists (ASA), also known as American Association of Anesthesiologists or American Association of Anesthesiologists. The Association was founded on 1905 by nine colleagues from Long Island Anesthesiologists Association. 199 1 changed its name to new york Society of Anesthesiologists. 1935 was renamed American Society of Anesthesiologists (ASA) due to the increase of its membership.
ASA anesthesia grading, also known as anesthesia grading. The American Anesthesia Association (ASA) classifies patients according to their physical condition and surgical risk, and divides them into five grades before anesthesia.
1 grade: the patient's vital organs and systems function normally, and he has good tolerance to anesthesia and surgery. In general, there is no risk.
Grade 2: The systemic disease is mild, and the important organs are slightly diseased, but the compensatory function is sound. It can tolerate general anesthesia and less risky surgery.
Grade 3: serious systemic disease, impaired function of important organs, but still within the scope of compensation. Limited movement, but not lost the ability to work. Anesthesia and surgery have certain concerns and risks.
Grade 4: Suffering from serious systemic diseases, serious pathological changes of important organs, incomplete functional compensation, loss of working ability, and often facing life safety risks. Anesthesia and surgery are both dangerous and risky.
Grade 5: critically ill, dying, desperate for surgery. Anesthesia and surgery are extremely dangerous.
This classification is suitable for emergency surgery. Just add "e" or "urgent" next to the evaluation category. ASA is the code of American Samoa in FIFA.
ASA is short for Scandinavian Airlines.
Asa Asa: This name means "doctor"
Asa Asa: God's gift to the healer