The four standards are: "Restriction of polybrominated biphenyls and polybrominated diphenyl ethers in electronic and electrical products", "Liquid chrome (Cr) detection method for restricted substances in electrical and electronic products", "Electrical and electrical products" Lead (Pb), mercury (Hg), cadmium (Cd) detection methods and "Rapid screening of lead, mercury, cadmium, chromium and bromine in electronic and electrical products - X-ray fluorescence spectroscopy (XRF) method" . Among them, the first standard was drafted by Shenzhen Inspection and Quarantine Bureau, and the second standard Shenzhen Inspection and Quarantine Bureau participated in the formulation.
The expert group consisting of 13 units including the Ministry of Information Industry, the National Certification and Accreditation Administration, and Sun Yat-sen University has carefully and carefully reviewed the standards. The expert validation team believes that these four national standards have filled the gaps in national standards and reached the international advanced level.
The EU RoHS Directive has been officially implemented. It is very important to complete the national standards for the detection of toxic and hazardous substances in electrical and electronic systems as soon as possible to speed up the process of integrating China's relevant standardization work with international standards, and to cross the technical trade barriers set by the EU and other developed countries in terms of electrical and electronic equipment. The meaning. Experts pointed out that the formulation of these four national standards will further unify and standardize the testing of toxic and hazardous substances in electrical and electronic products, promote the substitution of harmful substances in electronic and electrical products, promote industrial restructuring, and actively respond to the two EU environmental protection directives. It is of great significance for enterprises to overcome trade technical barriers and further promote the export of China's mechanical and electrical products. In addition, China's "Measures for the Administration of Pollution Control of Electronic Information Products" was released on February 28, 2006 and will be implemented on March 1, 2007. As an important technical support for this management approach, these standards are also of great significance to China’s successful implementation of this management approach next year.
Vacuum-formed plastic is used to produce a variety of custom design parts.Vacuum forming become to be a popular and cost-effective solution for a wide range of plastic forming needs.
The product's application must be taken into consideration while selecting the material. Normal vacuum forming plastic included:Polyester, HDPE, LDPE, PVC,PETG,polypropylene, polystyrene, ABS, acrylics, polycarbonate, ASA as well as other ABS capped acrylic and ABS capped polycarbonate.
ABS plastic also named Acrylonitrile Butadiene Styrene,is the most widely used in vacuum forming and available in a range of textured, smooth and embossed finishes, offered in virgin, recycled,UV resistant and flame retardant grades(UL94-V0). As good impact resistance ABS usually is vacuum formed for vehicle,equipment,plastic tray and so on industrial.
HIPS plastic also named High Impact Polystyrene ,is most used in Point of Sale (POS), display and signage market due to its visual appearance (colour options, gloss level, texture), the ease with which it can be processed along with its antistatic and electrical conductivity.
HDPE plastic also named High-Density Polyethylene,is widely used in indoor and outdoor applications including bottles, playground equipment packaging and furniture. It is a plastic with high tensile strength, and good chemical and corrosion resistance.And it has properties of recycling,UV stabilised, improved impact resistance.
PP Plastic also named Polypropylene,is similar to PE. But PE is more harder more heat resistant.But PP is more durable.Mostly plastic tray is produced by PP plastic.
PMMA plastic also named acrylic or glass fiber.It has properties of tensile strength, transparency, polishability and UV tolerance but less impact strength.It is available in clear, antiglare, opal, white, and frosted.It is best choice for windows, displays or see-through enclosures.
PETG named Polyethylene Terephthalate Glycol is another clear rigid plastic sheet.PETG is easily vacuum formed, printed, bonded and polished. As its' excellent clarity and impact resistance, it is widely used in outdoor application.
PC named polycarbonate, has combined advantage of PMMA and ABS. Usually is transparency and semi- transparency. It is expensive but that is best choice for clear plastic vacuum forming.
ASA is one new material which has all good properties of ABS. But much good UV resistant for outdoor usage. It usually be used for radome,air conditioning housing etc outdoor products.
Meanwhile, ABS capped acylic combined the good properties of ABS and acylic. ABS capped polycarbonate combined the good properties of ABS and polycarbonate.If you need high glossy surface for your design,then this is your only choice.
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