On November 28, the officials of the Ministry of Environmental Protection responsible for the project review and the accompanying experts rushed to Guangdong Meizhi Refrigeration Equipment Co., Ltd. to conduct an on-site inspection of the Meizhi “R290 compressor production line reconstruction†project. Through careful verification of the hardware equipment, technical management, financial management, production and sales scale of the Meizhi R290 compressor production line, the experts acknowledged that the relevant data sheets of the R290 compressor production line provided by Meizhi meet the requirements.
In July 2010, the Executive Committee of the 61st Montreal Protocol Multilateral Fund of the United Nations formally established the “R290 Compressor Production Line†project of Guangdong Meizhi Refrigeration Equipment Co., Ltd. as a demonstration project of the United Nations Multilateral Fund. As a new type of environmentally-friendly refrigerant with energy-saving and low-carbon advantages, R290 represents the development direction of refrigerants in the future, becoming a new technology promoted by the United Nations Multilateral Fund, and it is also a new technology that China has focused on.
The Ministry of Environmental Protection attached great importance to this project. The special committee sent a commissioner to Meizhi Company for review. Under the strong support of the Ministry of Environmental Protection and through the guidance of experts, the project has passed the first phase of the review, which is of great significance to the development of domestic R290 refrigerant technology.
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 Asbestos brake pads have largely been replaced by non-asbestos organic (NAO) materials in first world countries.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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