1. Definition of appearance defects
1) Round defects: appearances of round appearance defects such as bubbles, white spots, scratches, pits, foreign matter, anti-glare treatment, and round defects not treated by anti-glare.
2) Linear defects: manifested as linear appearance defects such as scratches, scratches, foreign matter, anti-glare treatment, and linear defects that are not treated by anti-glare.
3) Convex defects: impurities or other defects protruding from the surface of the glass.
2. Appearance inspection method
The specific test method is as shown in the figure: first, hold the two short sides of the glass with both hands to check the long direction; then hold the two long sides of the glass to check the width direction; generally, the long direction is dominant. (Or place the glass horizontally on the shelf, the light source is under the glass). Check the vertical direction according to the visual inspection standard. The inspection time is 20-30 seconds.
Dimensional inspection
1, long, wide size inspection
1) Allowable deviation: The allowable deviation of the anti-glare glass length and width dimensions is ±0.5 mm.
2) Inspection method: measure the distance between two parallel sides with a large vernier caliper.
2, thickness inspection
1) Allowable deviation: The allowable deviation of the thickness of the anti-glare glass is ±0.2 mm. The same piece of glass has a poor thickness, a thickness of 3 mm of 0.2 mm, a thickness of 4 mm, and a 6 mm of 0.3 mm.
2) Inspection method: The outer diameter micrometer with an accuracy of 0.01 mm is measured at the midpoint of four sides within 15 mm from the edge of the glass plate. The thickness difference of the same piece of glass is the difference between the maximum value and the minimum value among the four measured values.
3. Diagonal inspection
1) Diagonal line requirement: The difference between the two diagonal lengths should be no more than 0.2% of the average length of the diagonal.
2) Inspection method: The distance between the vertices of the corresponding corners of the glass is measured with a steel tape with a minimum scale of 1 mm.
Anti-glare glass is suitable for all kinds of displays and protection screens, museum art protection glass, all kinds of advanced photo frame picture frame glass.
This classification including carbon Steel Square Hollow Section and rectangular hollow section, usually they are used for contruction purpose, also some customer use them for car , billbord, stents, fence etc.
Jinan Xin Jiyuan is specialized in ERW and Seamless square&rectangular tube/pipe, hollow section structure pipe, and galvanized pipe in China. Annual output reaches 1.5 million tons. We have 2 production lines, could producte square pipe from 20*20*1mm to 600*600*35mm, rectangular pipe from 20*30*1.2mm to 600*800*35mm. Xin Jiyuan can manufacture square rectangular pipes as per the standards of ASTM A500, JIS G3466, EN10219, EN10210,DIN2240, BS1387, AS1163. Steel Grade: A500 GR.A/B/C/D, SS400, STKR490, S355JR, S275JO, S275J2, S355J0, S355J2, C350, C350 L0 ect.
We have three heat treament furance, two furnace of 100 mt, and one furnace of 300mt, that means we could finsih 500mt goods at the same time.
Carbon Steel SHS And RHS,Carbon Steel SHS,SHS Steel Pipe Square,RHS Astm Square Tube
JINAN XIN JIYUAN SPECIAL SECTION TUBE CO., LTD. , http://www.squarepipes.com