Asbestos was added as an common ingredient to Brake Pads post-WWI, as car speeds began to increase, because research showed that its properties allowed it to absorb the heat (which can reach 500 °F) while still providing the friction necessary to stop a vehicle. However, as the serious health-related hazards of asbestos eventually started to become apparent, other materials had to be found. Asbestos brake pads have largely been replaced by non-asbestos organic (NAO) materials in first world countries. Today, brake pad materials are classified into one of four principal categories, as follows:
Non-metallic materials - these are made from a combination of various synthetic substances bonded into a composite, principally in the form of cellulose, aramid, PAN, and sintered glass. They are gentle on rotors, but produce a fair amount of dust, thus having a short service life.
Semi-metallic materials - synthetics mixed with varying proportions of flaked metals. These are harder than non-metallic pads, more fade-resistant and longer lasting, but at the cost of increased wear to the rotor/drum which then must be replaced sooner. They also require more actuating force than non-metallic pads in order to generate braking torque.
Fully metallic materials - these pads are used only in racing vehicles, and are composed of sintered steel without any synthetic additives. They are very long-lasting, but require more force to slow a vehicle while wearing off the rotors faster. They also tend to be very loud.
Ceramic materials - Composed of clay and porcelain bonded to copper flakes and filaments, these are a good compromise between the durability of the metal pads, grip and fade resistance of the synthetic variety. Their principal drawback, however, is that unlike the previous three types, despite the presence of the copper (which has a high thermal conductivity), ceramic pads generally do not dissipate heat well, which can eventually cause the pads or other components of the braking system to warp.However, because the ceramic materials causes the braking sound to be elevated beyond that of human hearing, they are exceptionally quiet.
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So what is the network alarm? In general, the networked alarm system is a combination of technical defense, air defense, and physical defense as a whole, to establish an alarm center, to install networked alarm hosts for network access customers, provide security services, and collect service fees for a security investment project.
Why do we need to install a networked alarm system, and what benefits can the installation of a networked alarm system bring to society and the city?
First: to lay a foundation for building a harmonious society and a safe city, for the public security department of the country to have a police situation, to reduce the burden of the police to achieve a strong science and technology police, electronic, information. At the same time, the Ministry of Public Security at all levels, in the country to build a safe, harmonious society, the establishment of 'military power chapter' to improve the performance of local government officials!
Second: You can bring security to many local shops, homes, and businesses. This is the basis of society!
Third: Our company's office agents, security companies will earn the most abundant wealth of safe wealth! We can calculate that even if there are 20,000 shops in each city, each shop earns 50 yuan per month, and 20,000*50 million yuan in revenue, not to mention home installation, and companies, banks, The school’s monitoring intercom (monitoring is the Ministry of Public Security’s provisions of the Golden Shield Project, Internet cafes, entertainment venues, public facilities, and mandatory installation of surveillance cameras). What’s more important is that after a networked alarm center is established, it’s like a rent collection. Like the landlord, as long as someone rents our house, the landlord has income. After the establishment of the network alarm center, as long as there are families, shops, businesses want to enjoy the security service of electronic bodyguards, our agents or security companies have income, which is a one-time investment in lifetime income projects!
Fourth: We always believe that helping the society is to help ourselves. Our products bring social security and bring our customers 'safety wealth'. It also brings our own development and is powerful.
Fifth: Promoting the development of China's insurance industry.
Shen An Group is a large-scale manufacturer of regular security products that specializes in the production of urban networked alarm systems, shop networked alarm systems, and community networked alarm systems. In the area of ​​network alarm system has many years of experience in production research and development, networked alarm host features a variety of domestic community environment, management characteristics, belonging to the community dedicated network alarm system, network alarm center. There are thousands of security companies, networked alarm system operators, and property companies in China that use the Shen An Group smart community networked alarm system for residential property security management, community homeowner's network security theft, community perimeter prevention, in order to maintain the community security, The establishment of a safe community and the maintenance of the life and property safety of the community owners will bring a tremendous boost.
Analyze the benefits of installing a networked alarm system for society and the city
The benefits of installing a networked alarm system for society and the city:
Release Date:2012/4/13 9:01:20