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Tempered Glass

What is Tempered Glass

 

Tempered or tempered glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. Tempering puts the outer surfaces into compression and the interior into tension. Such stresses cause the glass, when broken, to shatter into small granular chunks instead of splintering into jagged shards as ordinary annealed glass does. The granular chunks are less likely to cause injury.

 

Benefits of Tempered Glass
 

It's safer
The biggest advantage of tempered glass over annealed or “ordinary” glass is that it was designed for safety. Unlike annealed glass, which breaks into large and dangerous shards, tempered glass disintegrates into small granular chunks that are relatively harmless.

 

It's tougher
The thermal tempering process used to manufacture tempered glass makes it much stronger than ordinary glass. Tempered glass can stand up to strong winds, direct impact from blows and bumps, and minor explosions.

 

It's heat-resistant
Tempered glass can resist temperatures of up to 470 degrees Fahrenheit. This property makes tempered glass ideal for use in kitchen appliances and in areas like the bathroom, where it will likely be in contact with the heat on a regular basis.

 

It's crystal clear
While the tempering process makes tempered glass super tough, it doesn't affect the clarity of the glass. Tempered glass is crystal clear and transparent, which makes it useful in windows, display cases, and glass doors.

 

It's versatile
Tempered glass can be used practically anywhere glass is needed. It makes for an attractive and sturdy frameless shower door, a fully transparent smartphone screen protector, and a seamless stovetop base.

 

It doesn't scratch easily
The manufacturing process that makes tempered glass thermally tough also makes it scratch-resistant. This makes tempered glass an ideal material for glass doors, kitchen appliances, mobile screen protectors, and passenger vehicle windows.

 

It is available in various designs and patterns
Tempered glass can be clear, frosted, engraved, stained, and patterned. It's available in an array of patterns and designs to suit your needs.

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Expertise

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Customer-focused

We prioritize the satisfaction of our clients and make sure their needs are met in a timely and effective manner.

Cutting-edge technology

We constantly update our tools and technology to stay ahead of the competition and provide the best service possible.

High-quality service

We deliver high-quality service, ensuring that our clients receive value for their investment.

Quality

The quality of a company's products or services is crucial. Look for companies that use high-quality materials and have strict quality control processes.

Characteristics Of Tempered Glass
 

 

Properties Tempered Glass
Thermal Shock Resistance Up to 250c
Mechanical Strength Up to 5x stronger than annealed
Tensile Strength 65 MPa
Bending Strength 120-200 N/mm2
Surface Compression >95 MPa
Design stress for architectural projects 50 MPa
Fragmentation Small pebbles
Fabrication No cutting or drilling after temper
Standard ANSI Z97.1 American National standard for glazing materials used in buildings – safety performance specifications and methods of test.
ASTM C1036 Standard specification for flat glass.
ASTM Standard specification for heat treated flat glass.
Compliance Tempered float glass shall comply with ASTM C1048, Type 1, Class 1 (clear), Glass 2 (tinted), Quality Q3, Kind FT.
Tempered safety glass products in the US are to comply with CPSC 16 CFR part 1201 for category II materials.

 

Types of Tempered Glass
3mm 4mm High Temperature Borosilicate Glass Door
Intelligent Heating Control Panel Glass
High Temperature Tempered Glass
High Temperature Tempered Glass

Clear glass
Is nearly colorless, and has a green or blue/green edge. It is typically made in thicknesses ranging from 3/32" to 3/4". Clear 1/4" thick glass will allow about 90% of visible light to pass through and will reflect about 8% of visible light. When looking through the glass, as the glass gets thicker the faint green color becomes more noticeable and light transmittance drops.Glass Interior

 

Tinted glass
Heat tempered glass is made by adding color pigments to the raw materials in the float process. Standard colors include bronze, gray, dark gray, green, blue and blue/green. Imported glass may be in non-standard colors. The color density is a function of thickness, as the glass gets thicker the density of the color increases and the amount light transmittance decreases. Because tinted glass reduces the amount of light transmitted, it also absorbs some of that solar energy, called heat absorption. This added heat causes thermal stress which may affect the glass and can cause it to break if it is not tempered.

 

Reflective glass
Solar control glass is a clear or tinted glass that has a thin layer of metal oxide, approximately .000003" thick, applied to the surface of the glass. Reflective glass has aesthetic appeal because of the multitude of color choices available, but on the other hand it becomes more expensive to replace if broken. It increases energy savings by reducing solar heat gain while allowing some of the visible light to pass through.

 

Low E glass
low emissivity is a type of reflective glass that appears to be clear while reflecting heat back to its source. It reduces heat loss while providing maximum light transmittance, and also helps resist UV rays. Depending on viewing angle and sunlight a slight tint can be seen. Glass from different runs or with different metal oxide coatings will exhibit differences of hue or color, making it extremely difficult to match multiple lites of Low E glass.

 

Obscure glass
Patterned glass, figured glass, decorative glass is typically a type of rolled glass that has a pattern embedded into the surface of the glass by the roller. The pattern diffuses the detail of objects viewed through the glass, and the degree of diffusion is a function of the pattern chosen. Some patterns can not be tempered because of the depth of the pattern or the method of manufacture. Available thicknesses depend upon the particular pattern.

 

Stained tempered glass
Art glass, opalescent glass, cathedral glass is typically a type of rolled glass. It is generally manufactured in small batches and may have multiple colors in one piece of glass. Stained tempered glass can not be tempered.

 

Wire tempered glass
Wire tempered glass is a type of rolled glass that has a welded wire net which is fed into the molten glass just before the glass enters the rollers. The rollers embed the wire in the glass and then both surfaces are ground and polished. Diamond shaped and square shaped patterns are typical and may also be obscure. Wired glass is commonly used in fire rated openings because the wire holds the glass in the sash if it breaks. There are limitations on the square footage of wired glass per opening based on the rating required. It is not a safety glass and can not be tempered.

 
Various Uses of Tempered Glass
 
01/

Car glasses
Most of the car company have and stresses to use this type of glass. They are much more protective and strong in nature. To be very specific if this type of glasses breaks down then it will be noticed that there are small rectangular pieces but in case of other glasses, there are so many pieces that it is hard to identify it.

02/

Use in the commercial building
Most of the commercial buildings like hotels or shopping malls mainly rely upon to use this type of glasses. This is because the glass should be durable enough to protect the place from any type of attack or human interference. The glass is so strong that it is hardly tough to recognize any type of scratch marks. Even the glass is placed on the railings then it is strong enough to protect the whole area.

03/

Walls of the house
Most of the modern residential buildings sometimes rely upon to put tempered glass as their walls. Sometimes they are designed in such a beautiful manner that the whole look of the house changes to a great extent. Thus the glass used should be strong and durable enough to protect the house from any type of external attack. Hence these glasses are of such type so that they are strong and elegant at the same time.

04/

Glasses used on furniture
You might have noticed that the modern furniture and tables use this type of special glass for increasing their durability. The glass proves to be the best if any type of hot items are placed then no damage is observed. Even there is no such crack that is found on the glass. Whereas normal glass usually cracks or breaks down if hot items are placed over it. Furniture companies use most of their glass tops mainly made of tempered glass. Even the demand of this type of glass has tremendously increased due to its good value and durability.

05/

Corporate use
Many offices or corporate places often need various types of glasses for their partitioning. In such a case if there is a normal glass then the whole thing is transparent. Even such glasses are not at all strong. So in order to avoid such a situation, most of the companies prefer to use this type of glasses for their convenience and privacy too.

06/

Decorative nature of the glass
If you wish you can decorate the glass as per your wish. The glass can withstand any type of decorations or paints on its body. This is a very good advantage of using such type of glasses. On the other hand, they are easily washable and anything on the body can be easily removed from it. During Christmas and Halloween, many people decorate various type of things over the glass.

How Is Tempered Glass Made?
 

Preparation
First, the tempered glass is cut to the desired size. To ensure the integrity of the glass, cutting must take place before the tempering process begins. To reduce the chance of breakage during the tempering process, the glass is examined for any imperfections. Sharp edges are removed with an abrasive, like sandpaper. Then the glass is washed.

 

Heat treatment
After the tempered glass is prepped, it is sent through a tempering oven that heats the glass to a temperature of over 1,112 degrees Fahrenheit. (That’s as hot as lava!)

 

Quenching
Next, the tempered glass is cooled in a matter of seconds via a high-pressure cooling procedure called “quenching”. As the glass is blasted with high-pressure air, the outer surface cools far more quickly than the center. When the center cools, it tries to pull back from the outer surface. This keeps the center in tension while the outer surface goes into compression. This is how tempered glass gets its strength – glass in tension is about 5 times more breakable than glass in compression.

The Difference Between Tempered Glass And Laminated Glass
 

Tempered glass is around four times stronger than “normal” glass but is limited in its applications

Both tempered glass and laminated glass are often referred to as “safety glass”

Both tempered glass and laminated glass shatter differently (more safely) than “normal” glass

Laminated glass can include a variety of other materials and applications, lending more versatility to the products

The Process Of Tempering Glass

 

 

Step 1: Pick The Glass. We have sheets and sheets of glass that are 8 feet by 11 feet. We can store more than 1,000 sheets of glass in our warehouse at time. The thickness ranges from 5/32 to 1/2 inch. We have everything from clear glass to frosted glass to clear mirror.

 

Step 2: Cut the Glass into the Desired Shape. The sheet of glass gets move by a machine and placed on the CNC Cutting Machine. The CNC machine is programmed to cut the desired shape. Afterwards, the employee breaks the excess glass manually.This has to be done before the glass is tempered, as the tempering process will weaken the glass if it is cut or etched afterward and may increase the likelihood of breakage.

 

Step 3: Seaming Machine, Glass Edger, CNC Mill or Water jet. Depending on the type of order, the sheet of glass can go several different ways either to the seaming machine, glass edger, CNC mill or water jet.
The seaming machine is used to take the sharp edge off of the glass. The glass edger creates a ground or high polish on the edge of the glass. The CNC Mill is used to make or edge custom and DOT patterns. It can cut, seam, or even high polish shapes and holes. Like drilling, milling uses a rotating cylindrical cutting tool. Abrasive water jet cutting technology is a great method for cutting glass because it allows for contours and shapes that cannot be achieved or achieved easily with other cutting machines at a reasonable cost.

 

Step 4: High Speed Washer. This removes any tiny grains of glass deposited during the other processes, as well as any dirt that may interfere with the tempering process.

 

Step 5: Heat the glass in the tempering oven. The oven reaches temperatures of over 600 degrees Celsius (1,112 degrees Fahrenheit), with the industry standard being 620 degrees Celsius (1,148 degrees Fahrenheit). The temperatures changes depending on the thickness of the glass, color of the glass or even the temperature outside. The tempering process takes about 2-25 minutes.

 

Step 6: Quench the glass to cool it. The heated glass is subjected to seconds or minutes of high-pressure blasts of air at various angles. The rapid cooling causes the outer surfaces of the glass to cool and contract faster than the center, giving the tempered glass its strength.

Annealed VS Tempered VS Laminated Glass Differences

Annealed (non safety) plate glass
Annealed glass gets its name from the process by which it is made- the Annealing Process. The glass is heated above its “annealing point” of 600 degrees and then is cooled at a very slow and controlled rate. Annealed glass, unlike laminated or tempered safety glass, breaks into sharp glass shards that can have devastating results if improperly installed. Annealed glass has the potential to free fall and cut in a similar fashion of a guillotine.

 

Tempered glass
Tempered glass, also referred as “toughened glass,” is plate glass that goes through a special heat & cooling treatment to toughen the glass. The annealed plate glass usually is heated to 1110 degrees then is cooled on the outer surfaces. The cooling pattern causes the outer surfaces to contract faster than the center thus giving the tempered glass its strength.
Tempered glass is considered safety glass because it shatters in a unique way that prevents harm. You can see broken glass with the picture on the left. The glass often shatters or ‘explodes’ into many tiny and dull pieces.


When to use tempered glass
Tempered glass can withstand 5-7 times the amount of pressure than annealed glass, thus it is best used when safety is of concern. Tempered glass can quickly and safely shatter when a situations arises where one has to either escape or be rescued from harm.
Tempered glass is choice for high end retailer’s display cases and storefronts because tempered glass can be created from ultra-clear low-iron glass. Unfortunately glass that has been tempered cannot be cut, therefore it is unwise to choose tempered glass when a non-professional measures the glass. The tempering process generally takes 6-10 business days as the wait time is contingent on how busy the tempering facilities are. We recommend laminated-safety glass when time is of essence.

 

Laminated glass
Laminated glass is a type of safety glass. Rather than shattering like tempered glass, laminated glass maintains its integrity after breaks. Laminated glass is basically a sandwich. It has two sides of glass that sandwiches vinyl- either polyvinyl butyral (PVB) or ethylene-vinyl acetate (EVA). The laminated unit can be made of either annealed or tempered glass.

 

When to use laminated glass
Laminated Glass maintains its integrity when blunt force is used against it therefore s is great solution when break-in security is a major concern. Examples of laminated glass include storefront doors, windows, and display cases. All windshields are, by law, laminated glass- this prevents shards of glass flying into the car when objects hits the windshield.

Company Advantages
 

Heyuan Hongwei Glass Co., Ltd. located in Heyuan City, the National High-tech Development Zone.The product is positioned in the high-end TV, monitor, home-used air conditioning, refrigerator and other household appliances related to glass products.The company has a 10000 square meters modern deep processing room ,with cutting and grinding integrated molding edge grinding machine, automatic inspection equipment, CNC machining center, continuous tempering furnace and other glass deep processing equipment,Ensure that the glass is cut, grinded, special-shaped, and tempered (2-5mm) for finishing,Specializing in the production of high-precision TV, LCD/LED screen protection glass, AR anti-reflection glass, digital picture frames, advertising machines, photocopier glass, etc. 

 

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Our Certificate
 

Our company passes ISO90001. 3C Certification.Our products comply with ROHS, REACH, EN12150-1 and other standards 

 

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Asked Questions

Q: Do windows next to sliding doors need to be tempered?

A: If a window is located within 24" of a door, is tempered glass required? Answer: Yes, if the glazing is in the same plane as the door and the bottom edge of the glazing is less than 60 inches above the floor.

Q: When should tempered glass be used?

A: If a glass' bottom edge is less than 60 inches above a walking or standing surface (like a shower floor), then the glass must be tempered. Moreover, for a hot tub, glass must be tempered if its bottom edge is less than 60 inches above the walkway and less than 60 inches from the water's edge.

Q: Why we should not use tempered glass?

A: If you want real screen protection you want something with high impact resistance and shatter proof. Glass will never be shatter proof so you will never get real impact resistance performance from Tempered Glass. This may feel like an ad but Rhino Shield is currently the best on the market for impact resistance.

Q: What are the pros and cons of tempered glass?

A: Tempered glass is also extremely durable and can survive big storms and strong winds. A disadvantage of tempered glass is that once the glass has been through the tempering process, it can no longer be cut and processed. Unlike laminated glass, tempered glass cannot be repaired.

Q: What locations are tempered glass required?

A: The greater risk of slip and fall injuries in wet areas means that bathrooms, saunas, and hot tubs are places where is tempered window (glass) necessary. You must temper all glass if its bottom edge is less than five feet above a walking or standing surface such as a shower floor.

Q: Do windows close to the floor need to be tempered?

A: A window must be tempered glass if all of the following criteria are met: more than 9 square feet in one single piece of glass that is 18 inches or less from the floor and the top of the glass is greater than 36 inches above the floor and has a 36-inch walkway on either side of the glass.

Q: Why do bathrooms have tempered glass?

A: However, with tempered glass, you can ensure both safety and aesthetics. These enclosures are also easier to clean and upkeep since the glass does not stain. You need not worry about the wet floor as the water does not seep out.

Q: How thick should tempered glass be for a door?

A: Interior doors are normally made with 1/4″ thick single pane glass (called “single glaze” or SG glass). Exterior doors generally use 1/2″ or 5/8″ thick “insulated glass” (called IG), with two or three panes hermetically sealed and separated by dry airspace.

Q: Do bathrooms need tempered glass?

A: A bathroom window must be made of tempered glass if all the following criteria are met, according to the National Glass Association: The glazing (glass) is less than 18 inches above the floor. The size of your window exceeds nine square feet. The top of your window is less than 36 inches above the floor.

Q: Should all windows be tempered glass?

A: The extra strength is needed near entrances to prevent glass shatter, and to comply with most building codes. All windows including; single pane and double pane windows need tempered glass if it's within a certain number of inches from the door.

Q: Are tempered glass windows more expensive?

A: Tempered glass typically costs more than regular annealed glass or laminated glass due to its manufacturing process. However, when you factor in its longevity and safety features, many would argue that it's worth the investment.

Q: Are cheap tempered glass worth it?

A: Cheaper options may not offer the same level of protection or may not be as durable. It's important to carefully consider the features and quality of the tempered glass protector when making a purchase to ensure that it meets your specific needs. Most of the cheap tempered glasses will not have Oleophobic coating.

Q: Does tempered glass weaken over time?

A: As the tempered glass slowly deteriorates with use and temperature changes, the chip slowly spreads on a microscopic level. Over time, the glass is weakened enough to shatter. While it may seem that there is no cause for the break, there is always a reason why glass breaks spontaneously.

Q: Are tempered glass worth it?

A: For most people, a tempered-glass protector will be the best choice, because it offers the highest level of damage prevention and has a smooth touch.

Q: What is the lifespan of tempered glass?

A: The lifespan of a tempered glass screen protector can vary depending on the quality of the product and how often you use your device. However, a good suggestion is to replace your tempered glass screen protector every 3-6 months or as soon as it starts to show signs of wear.

Q: Why is tempered glass so expensive?

A: Tempered glass can't be adjusted once it has undergone the tempering process, which means each piece of glass has to be custom manufactured. This makes it much more expensive to install than some other options, like security window films.

Q: Can tempered glass be cut?

A: No, tempered glass cannot be cut after it has already been shaped because this will likely result in costly damage. Editor's Note: This blog post was originally published in February 2017 and has been revised to reflect industry updates.

Q: What to look for when buying tempered glass?

A: This is why it's important to consider the thickness of your glass screen protector before buying one. Ensure it's not too thick or too thin to do its job correctly. Thin glass won't offer much protection from drops or scratches. Glass that's too thick glass could affect your device's touch sensitivity.

Q: Does tempered glass need a stamp?

A: Tempered glass is stamped with an identifier, which can be found in the corner of the sheet of glass. The identifier will show the manufacturer name and the CPSC (Consumer Product Safety Commission) standards, e.g. “CPSC 16 CFR 1201 CAT II”. This proves if the glass is tempered or not.

Q: How thick should tempered glass windows be?

A: The vast majority of residential windows use Single Strength glass which is 3/32” thick. For larger windows, Double Strength, or 1/8” thick glass may be required. For extremely large residential window it may be necessary to use 5/32” or 3/16” thick glass to assure adequate wind-load resistance.

As one of the leading tempered glass manufacturers and suppliers in China, we warmly welcome you to wholesale cheap tempered glass from our factory. All custom made products are with high quality and competitive price.

Special Shaped Tempered Glass Heating Control Panel, Different Shapes Touch Panel Tempered Glass, 55 110 Display LCD Touch Panels Panel