Meanco Glass Industrial Co., Ltd.  

Product Name: Clear Glass Coaster Style: Simple Usage: Home, Restaurant, Cafe, Office Characteristics: Tempered Color: Clear Logo Printing: Can Be Printed Diameter: 100 Shape: Square Material: Glass Application: Home Type: Glass Tableware Glass Type: Tempered Glass Trademark: Meanco Transport Package: Inner Packing: Lined with Paper, Specification: Outer pakcing: 5 ply-corrugated cartons Origin: Made in China HS Code: 7007190090 Product Description Product Specification and Features- Material: Float glass- Tempered or non- tempered, depends on your requiement- Diameter: 10-10CM (customized size are welcome)- Thickness : 4mm or 5mmTest for quality control:1. FLATNESS CHECKPlace the glass lid on a completely smooth table , and put a piece of 1mm thickness iron plate beside the ring the glass lid, then moving the iron gauge along with the circumference of the lid, the glass lid passes the test if the iron plate does not push in2. THTERMAL SHOCKPut the glass lid into oven temperature to 200°C, and constant temperature for 30 minutes, remove it immediately into 20°C water , glass no broken or crack3. IMPACT TESTPlace a lid, domed size up, on a hard surface,Dropping a 225 grams steel ball from a height of 1.5meter,No fracture no shatter, to passNote : Don't drop the ball near or onto a vent hole /rivet hole 4. SCRATCH TEST (PRESSURE TEST)Use 120-grit (abrasive paper ) sandpaper to scratch two side and three directions 15 times, then put into room temperature water for 15 minutes, it pass if no breakage and no crack.5. POLOLARISCOPE CHECKTo test the balance of compressive stress and tensile stress depends on the color what you see.6. FRAGMENTATION CHECKApply tape (adhesive film)on the convex (front) surface of the lid, domed side upward, break it with a hammer broken 5X5cm measuring range , number of particles (fragments) counted should be at least 40,The purpose of this test is to determine whether the glass has been adequately toughened.