Optical glass is produced using raw materials such as oxides, hydroxides, nitrates, and carbonates. Depending on the formulation, phosphates or fluorides are added to achieve the desired properties. To ensure clarity and transparency, the levels of colored impurities—like iron, chromium, copper, manganese, cobalt, and nickel—must be strictly controlled. During the weighing process, precision and uniform mixing are essential to maintain consistency in the final product. The main production steps include melting, forming, annealing, and inspection. Melting can be done using a single-batch method or a continuous kiln system. The single-batch method further divides into clay crucible melting and platinum crucible melting. Regardless of the method, stirring is crucial to achieve a homogeneous melt. Temperature and stirring must be carefully regulated throughout the process. Clay crucibles are cost-effective for melting most bismuth and flint glasses, especially when the melting temperature exceeds the limits of platinum. Platinum-rhodium crucibles are used for high-quality glasses that are highly corrosive to clay, such as heavy lead, strontium, rare earth, and fluorophosphate glasses. These crucibles are typically heated using silicon carbide or silicon molybdenum rods, but high-frequency heating may be applied for glasses prone to devitrification, requiring rapid cooling and specific atmospheric conditions. Since the 1960s, many countries have adopted continuous kilns lined with platinum, significantly increasing the output and quality of optical glass. This approach has become the dominant trend in modern optical glass manufacturing. Molding techniques for optical glass include traditional methods like breaking, rolling, and casting. However, more advanced methods like leakage molding—where liquid is drawn directly into rods or dripped into molds—are now widely used. This technique improves material utilization and yield by producing large blanks efficiently. Annealing is a critical step to reduce internal stresses and enhance optical uniformity. A precise annealing schedule is necessary to ensure the highest quality finish. Testing involves measuring several key indicators, including optical constants, optical uniformity, stress birefringence, streaks, bubbles, and other visual imperfections. These tests help ensure the glass meets strict performance standards. All aluminum alloy material has strong plasticity and never rusts. Fluorocarbon baking powder is delicate, smooth, and long-lasting without fading. The product is intelligently matched with various smart devices, making it a minimalist, luxurious, and youthful fashion design style. Advantages of aluminum doors: aluminum room door, soundproof interior doors,aluminum door for comfort room,wood room door,interior wood doors Foshan Nanhai Jinfancheng Metal Building Materials Products Co., Ltd. , https://www.landrandoor.com
Strong and durable: Aluminum alloy has high strength and hardness, can withstand the collision and wear in daily use, and has a long service life.
Corrosion resistance: Aluminum will naturally form an oxide film in the air. This oxide film can effectively prevent aluminum from further oxidation and corrosion, making it stable and not easily damaged in environments such as moisture, acid and alkali.
Good fire resistance: Aluminum alloy has good high temperature resistance, which can play a role in fire prevention to a certain extent and increase the safety of living.
Good sealing: Aluminum doors can be equipped with high-quality sealing strips to effectively improve the sealing performance of the door, and have significant sound insulation, heat insulation, and dustproof effects.
Various styles: Through different surface treatment processes and designs, a variety of colors and styles can be achieved to meet different decoration styles and personal preferences.
Environmental protection: Aluminum is a recyclable material and conforms to the concept of environmental protection.