Because, the beginning of E is 3C certification, which is compulsory product certification in China, and the beginning of A is China product performance certification.
Tempered glass can be divided into plane tempered glass and curved tempered glass according to shape, in which the thickness of plane tempered glass is 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, etc. The thickness of curved tempered glass is 5mm, 6mm, 8mm, etc.
E0 is the highest grade, with the highest environmental protection index, and the formaldehyde content is at least ≤0.5mg/L (which belongs to the top international standard); Followed by E 1, ≤ 1.5mg/L (in line with European standards); E2 grade ≤5.0mg/L (in line with domestic standards); A 1 is the fire protection grade.
1. They are certified by different companies.
There is a screen printed CCC on tempered glass, followed by E * * * * * This is the compulsory certification number of China's safety products, which is what we often call 3C certification.
The beginning of e is certified by CTC (National Building Materials Certification Center).
A begins with CQC (National Product Quality Certification Center) certification.
2. They check different information on the website according to different numbers.
According to this number, you can find out which company produced the product on CTC website and whether your product is produced within the validity period of certification. According to CNCA document, tempered glass that has not passed 3C certification in China cannot be produced and sold.
The tempered glass products starting with E can be tested in CTC, and the tempered glass products starting with A can be tested in CQC.
Extended data:
3c, China Compulsory Product Certification, English name ChinaCompulsoryCertification, English abbreviation CCC. The full name of 3C certification is "China Compulsory Product Certification", which is a product conformity assessment system implemented by our government in accordance with laws and regulations to protect consumers' personal safety and national security and strengthen product quality management.
The state stipulates that products involving property safety and personal safety must be subject to compulsory certification. China has two certification bodies: CQC (National Product Quality Certification Center) and CTC (National Building Materials Certification Center).
Tempered glass E005575 is the manufacturer code of tempered glass certified by CTC and the production license number of tempered glass in this factory.
Characteristics of tempered glass:
1, safe
When the glass is damaged by external force, the fragments will break into obtuse-angled particles similar to honeycomb, which is not easy to cause serious harm to human body.
2, high strength
The impact strength and bending strength of tempered glass with the same thickness are 3-5 times that of ordinary glass.
3. Heat resistance
Tempered glass has good thermal stability, and can withstand three times the temperature difference of ordinary glass and the temperature difference change of 300℃.
Advantages:
1, the strength is several times higher than that of ordinary glass, and it is bending resistant.
2, the use is safe, the bearing capacity is increased and the brittleness is improved. Tempered glass is a small fragment without acute angle even if it is damaged, which greatly reduces the harm to human body.
Compared with ordinary glass, the quenching and heat resistance of tempered glass is improved by 3~5 times, and it can generally withstand the temperature difference of more than 250 degrees, which has obvious effect on preventing hot cracking. This is a kind of safety glass. Provide qualified materials to ensure the safety of high-rise buildings.
Disadvantages of tempered glass:
1. Tempered glass can no longer be cut and processed. Only the glass can be processed into the required shape before tempering, and then tempered.
2. Although the strength of tempered glass is stronger than that of ordinary glass, tempered glass has the possibility of self-explosion, while ordinary glass has no possibility of self-explosion.
3. The surface of tempered glass will be uneven (wind spots) and its thickness will be slightly thinner. The reason for the thinning is that the glass is softened by hot melt and quickly cooled by strong wind, which makes the crystal gap inside the glass smaller and the pressure greater, so the tempered glass is thinner than before.
Generally, the tempered thickness of 4~6mm glass is 0.2~0.8mm, and the tempered thickness of 8~20mm glass is 0.9 ~1.8mm.. The specific degree depends on the equipment, which is why tempered glass can't be used as a mirror.
4. General building flat glass will be deformed after being tempered in a tempering furnace (physical tempering), and the degree of deformation is determined by the process of equipment and technicians. To some extent, it affects the decorative effect (except for special needs).