Glass is a common item in daily life, most frequently seen in windows and doors. With technological advancements, the variety of glass has grown increasingly diverse. Understanding different types of glass is essential. Glass lid manufacturers introduce 24 common types of glass encountered in everyday life.

Glass cookware is one of the most common items in modern kitchens. When selecting glass pots, people often consider factors like their material properties—such as the maximum temperature they can withstand—and what to do if food burns to the bottom.
Crafted from quartz glass, these pots boast an extremely low thermal expansion coefficient and exceptional heat resistance. Combined with quartz glass's stable chemical properties, low electrical conductivity, and optimal ultraviolet light transmission, pots made from this material are highly versatile for frying, deep-frying, stir-frying, and stewing.
The primary material for glass pot lids is tempered glass. Due to variations in manufacturer materials and craftsmanship, the maximum temperature tolerance differs. Generally, they won't shatter within a temperature range of 250°C to 320°C. Temperatures above 320°C may pose a risk of breakage.
II. Removing Burnt Residue from Glass Pots
1. Glass pots themselves do not burn; it is the burnt food that adheres to the surface. Therefore, soak thoroughly before washing—ideally for several hours before cleaning.
2. Use a scouring pad or kitchen cloth to clean the glass pot.
3. For stubborn burnt marks that won't brush off, sprinkle baking soda or soak in warm water mixed with white vinegar for a while before scrubbing clean.
4. For severely burnt interiors, pour in white vinegar water or baking soda water and bring to a boil. Turn off the heat and let it cool until it's safe to touch, then scrub while still warm.
5. Alternatively, extend the soaking time (e.g., one to two days) before using a stronger cleaning powder.
As seen, glass cookware is relatively safe and can withstand high temperatures. It typically won't shatter within the 250°C to 320°C range, though risks increase above 320°C. It's advisable to choose reputable brands and avoid uncertified products.

Those who frequently follow the glass industry may have heard references to the relevant specifications for tempered glass. Although we often encounter tempered glass, many people lack in-depth knowledge of the glass industry, leading to various questions surrounding it. Today, we've compiled some information to help clarify these points.
China has established the following specifications for the production process of safety glass:
1. The production and use of safety glass must strictly comply with the provisions of the "Construction Law of the People's Republic of China" and the "Product Quality Law of the People's Republic of China."
2. Rigorous standards have been established for evaluating safety glass.
3. National quality inspection departments and other relevant authorities must oversee and manage the production and distribution of safety glass throughout the entire process.
4. Manufacturers should exercise self-discipline and strictly adhere to industry regulations.
5. All safety glass products leaving the factory must meet national standard requirements.
6. Imported safety glass products must undergo stringent inspection; any products failing to meet quality standards are prohibited from importation.
VII. Certain structures must use safety glass, including:
- Windows in buildings seven stories or taller;
- Ceilings for all types of canopies and skylights;
- Interior partitions;
- Floor panels designed to bear heavy loads;
- Guardrails for observation elevators;
- Viewing windows in aquariums;
- Entrances and exits of public buildings such as banks and police stations.
II. Types of Tempered Glass
Tempering levels are classified into three types:
1. Tempered Glass: Tempering degree = 2–4 N/cm; surface stress α ≥ 95 MPa for curtain wall tempered glass;
2. Semi-Tempered Glass: Tempering degree = 2 N/cm; surface stress 24 MPa ≤ α ≤ 69 MPa for curtain wall semi-tempered glass;
3. Ultra-Toughened Glass: Tempering degree > 4 N/cm.
Tempered glass is produced as single panes but can be further processed into laminated glass, insulated glass, and other multi-layer composite glass types. Compared to composite glass, single-pane tempered glass refers to the direct use of a single tempered glass pane.
Tempered glass is classified as safety glass. It is essentially a pre-stressed glass. To enhance its strength, chemical or physical methods are typically used to create compressive stress on the glass surface. When subjected to external forces, this surface stress is first neutralized, thereby increasing load-bearing capacity and improving the glass's resistance to wind pressure, thermal cycling, and impact.
Glass is an amorphous inorganic non-metallic material. It is generally manufactured using various inorganic minerals (such as quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, soda ash, etc.) as primary raw materials, supplemented by small quantities of auxiliary ingredients. Its main components are silicon dioxide and other oxides. The chemical composition of ordinary glass includes Na₂SiO₃, CaSiO₃, SiO₂, or Na₂O·CaO·6SiO₂, primarily consisting of silicate double salts. It is an amorphous solid with an irregular structure. Widely used in buildings for wind protection and light transmission, it is classified as a mixture. Other types include colored glass, which gains its hue through the incorporation of metal oxides or salts, and tempered glass, produced through physical or chemical processes. Sometimes, certain transparent plastics (such as polymethyl methacrylate) are also referred to as organic glass.

Tempered glass undergoes high-temperature processing and can withstand temperatures up to approximately 230°C. However, the temperature of a freshly boiled clay pot is too high to be placed directly on tempered glass.
Due to the presence of minute nickel sulfide inclusions within the glass, some of these inclusions undergo crystalline changes over time following heat treatment. This expansion can cause micro-cracks within the glass, potentially leading to spontaneous shattering of the tempered glass. Additionally, tempered glass inherently possesses internal stresses during production. Improper installation or usage that causes surface stresses to exceed certain thresholds can also trigger breakage.