MATERIAL AND USE: Made of borosilicate glass 3.3 (linear thermal expansion coefficient (3.3 ± 0.1) x 10-6/K) with a thickness of 2 mm and can withstand temperatures up to 400 °C, a special glass material with low expansion, corrosion resistance, high temperature resistance, robust, hard, transparent and chemically stable. Widely used for the cultivation of plant material, microbial culture and animal cell culture. SIZE: 90 mm. To meet your various needs and applications. Each item includes 5 petri dishes of the same size. Each part includes an upper lid and a lower dish. The upper lid acts as a dust cover. The bottom is flat and the upper lid fits, the work is meticulous, flat and smooth. WHY CHOOSE US: Unlike disposable plastic petri dishes that can only withstand a maximum temperature of 80 °C, Huanyu's glass petri dishes have a higher temperature resistance of 400 °C. More corrosion resistant to more chemicals. For laboratory personnel, they are easier to clean and handle. They can be reused multiple times, which is more environmentally friendly and economical. PACKAGING METHOD: Huanyu's packaging department has accumulated experience in global sales and takes into account all geographical and transport factors, which constitutes our own unique and professional packaging method. Before packaging, our staff checks for scratches, burrs and manufacturing defects. They remove defective goods and select only the best quality ones. Our exclusive packaging method minimizes damage during transport. CUSTOMER SERVICE: We are 100% responsible for damage that occurs during transport, because even if we use the most exquisite packaging, some damage may be unavoidable during the transport of glass items. If you find that your petri dish is broken, please be careful not to cut yourself on the glass shards and contact us immediately. Our exclusive customer service will help you solve the problem as soon as possible.