Whether it is a building or renovation project, selecting the perfect glass is of the utmost importance. Among the numerous glass options available, annealed glass and tempered glass have emerged as two of the sought-after choices.
However, before making the decision, it is essential to know what sets these two apart and how their application can impact the success of different projects.
So, let us delve into the world of annealed glass vs tempered glass and understand their unique features and applications.
What is Annealed Glass?
Also known as float glass, annealed glass is a type of glass that is thermally treated to relieve internal stresses.
This glass is made using an advanced float glass process, a two-step technique which involves heating the molten glass to a specific temperature and then slowly cooling it.
Owing to this, annealed glass offers a flat and smooth surface with high optical clarity and minimal distortions.
What is Tempered Glass?
Tempered glass is an upgraded version of annealed glass that is manufactured through a specialised process. In this process, the glass is heated up to around 600° C and then quickly cooled with high-pressure air jets.
This sudden cooling of glass transforms its molecular structure, leading to enhanced durability and impact resistance.
Annealed Glass Vs Tempered Glass
| Parameter | Annealed Glass | Tempered Glass |
| Cooling Process | Slowly cooled after the heating process. | Rapidly cooled (quenched) after the heating process. |
| Durability | Relatively low due to low tensile strength. | More durable as it has a higher tensile strength and excellent weather resistance. |
| Cost | Less expensive, therefore, it serves as an affordable solution for projects with limited budgets. | More expensive as specialised equipment and modern technology are used in manufacturing. |
| Breakage Pattern | When broken, it leaves sharp fragments that increase the risk of injury. | Leaves small, blunt fragments which helps reduce the risk of injury during or after breakage. |
| Strength | Weaker | Four to five times stronger than annealed glass |
| Noise Reduction | Limited sound reduction due to lower density and sound transmission class (STC) ratings. | Has better noise resistance due to increased glass density. |
| Energy Efficiency | Lower as it has a higher thermal conductivity, resulting in more heat transfer. | Higher as it minimises heat transfer. |
| Lifespan | Shorter | Longer |
| Fabrication | Can be cut using standard glass cutting tools. | Cannot be cut after tempering and specialised cutting tools are required. |
| Heat and Thermal Resistance | Lower; thus, it may crack or shatter with sudden temperature changes. | Higher as it does not crack or break even in sudden temperature changes. |
| Impact Resistance | Limited | High as it cannot break easily, reducing the chance of break-ins and intrusions. |
| Suitability | Decorative elements and non-structural applications | Safety-critical applications |
Annealed Glass Vs Tempered Glass: When to Choose?
Carefully considering your project’s safety and performance requirements is crucial for making the right glass selection.
Annealed Glass
As this glass has low impact resistance, it is better suited for projects that do not demand optimal strength.
Considering this feature, you can choose annealed glass for decorative features and non-safety critical applications, such as room partitions, doors and windows, storefronts in shopping malls, waiting areas, shelves and table tops.
Tempered Glass
As tempered glass can withstand heavy external loads, thermal stress and extreme conditions, it can be used for various industries, from architecture to interior design.
You can use tempered glass for:
- Interior design elements, such as walls, partitions and railings
- Shower enclosures
- Sliding doors and windows
- Exterior applications, including building façades, roof glazing, staircases, entrance doors, etc.
- Car sidelites
Coming to an End
Both annealed glass and tempered glass have unique characteristics that make them ideal for a wide range of applications.
However, if you want to make an informed decision, you have to understand the meaning, features, differences and uses of annealed and tempered glass. In addition to this, you must consider the specific demands of your projects and select a reliable glass company, such as AIS.
AIS is a leading glass solutions company that specialises in designing, manufacturing and marketing a wide array of glass products suitable for both residential and industrial applications.
For expert consultation and specialised glass solutions, contact AIS right away.