The 5 Things You Need to Know About Tempered Glass

Why should the glass be tempered?

  1. After the glass is tempered, its strength is several times higher. Its bending power is 3 to 5 times that of normal glass. Its impact strength is 5 to 10 times that of normal glass, which improves stability and safety simultaneously. The tempered glass can generally withstand drastic temperature changes of more than 150LC, significantly preventing thermal cracking.
  2. It is safe to use, and the load-bearing capacity is increased to improve the fragile nature. Even if the toughened glass is damaged, there are small fragments without acute angles, which significantly reduces the damage to the human body after the accidental broken glass.

How is the glass tempered?

The ordinary glass is cut to the required size and then heated to about 700 degrees close to the softening point of the glass, and after that quickly and uniformly cooled (usually 5-6MM glass is heated at 700 degrees for about 240 seconds, and then cooled down for approximately 150 seconds.), the glass is heated to an appropriate temperature and then quickly cooled, causing the glass surface to shrink sharply, resulting in compressive stress. However, the middle layer of the glass cools slowly, and it is a bit late to shrink, so tensile stress is formed, which makes the glass obtain higher strength.

safety glass exploration

What are the disadvantages of tempered glass?

  1. The toughened glass can no longer be cut and processed. The glass can only be processed to the required shape before tempering.
  2. Although the strength of tempered glass is stronger than that of ordinary glass, there’s still have the possibility of spontaneous explosion (breaking by itself) when the temperature difference changes significantly. In contrast, normal glass does not have the chance of spontaneous explosion.

Why does tempered glass explode?

Because the glass raw material contains nickel sulfide crystals, it is impossible to avoid the existing manufacturing technology in the world entirely. This kind of nickel sulfide crystal has two forms, A form and B form. Under particular time and temperature conditions, the A form will change to the B form, and the volume of the B form is 3-5 times the volume of the A form.

Although the volume of this kind of crystal is tiny, if this kind of crystal becomes B-shape inside, the increase in volume will affect the internal compressive stress balance of the whole piece of glass and cause the glass to break. There is no compressive stress inside an ordinary one. The deformation of its nickel sulfide crystals will not cause these problems. There is enough space for it to deform.

glass self-exploration

How to reduce the spontaneous explosion rate of tempered glass?

The self-explosion rate of tempered glass recognized in the industry is 3‰-5‰.

  1. Reduce glass impurities and improve purity from the production source.
  2. In the glass tempering process, use better equipment to function to make sure the internal stress of the glass is uniform, which leads to a lower spontaneous explosion rate.
  3. In the case of reaching the required strength, control the stress value of the tempered glass. The lower the stress, the lower the self-explosion rate.
  4. Do hot-dip treatment. After tempering, put the glass in a furnace at 300°C for about 8 hours to simulate extreme environmental factors so that the potential self-exploration glass may explode in advance, which can be understood as detonation treatment. Note, however, that there is still a risk of self-explosion of glass after hot dipping, and the self-explosion rate of glass is one in a thousand.
  5. Use ultra-white glass. When the glass is produced, the nickel sulfide impurity inside the glass is eliminated through a chemical displacement reaction. The self-explosion rate of this glass after tempering is one in 100,000.

If you want to have high quality Automotive grade glass sheet, you can contact Hangzhou Blue-Sky Safety Glass, we have advanced equipment to fulfill your requirements. Contact Us: sales@hzltglass.com

exhibit glass

Why is ultra-white glass so expensive?

Is there a glass with a low self-explosion rate, consistent color, high visible light transmittance, good permeability using advanced technology? Twenty years ago, it was a question I must answer you: how could it be?

But with the innovation of technology, original incredible technology has become a reality. Such glass has now been used everywhere in our daily buildings. It makes you often mistakenly think that there is no obstruction in front, ultra-white glass, aka low iron glass. Let me explain why it is expensive among other regular glass.

building glass

What is the low iron glass?

Ultra-white glass, also known as low-iron glass and high-transparent glass, is ultra-transparent low-iron glass. It can reach a high light transmittance of more than 91.5%, has crystal clear, known as the “Crystal Prince” of the glass family. It is a high-grade glass variety of high-quality, multi-functional features.

Ultra-white glass has superior physical, mechanical, and optical properties. At the same time, it has all the processing properties of high-quality float glass to allow for various deep processing.

Such features make ultra-white glass having a broad application space and bright market prospects. At present, only a few companies in the world master the production technology of ultra-white glass. Therefore, using ultra-white glass is a symbol of the luxury identity of the building.

glass for shopping mall

How to identify ultra-white glass

Recommended tools: camera, mobile phone, flashlight

Testing method

  1. Use a photographed mobile phone flash function to check if it has a substantial degree of lighting from the side of the glass.
  2. The genuine super white cylinder can see the seam of the lower glass by light from the cutting surface of the glass. You can see the bottom of the cylinder. And the unqualified super-white cylinder, the surface is green, and the light transmittance is poor.

What’s the advantage of ultra-white glass

  1. The self-explosion rate of glass is low in the ultra-white glass raw material; the internal impurity is minor due to the fine control of raw material melting, which dramatically leads to the low chance of self-explosion after being temperance.
  2. Color consistency Since the iron content in the raw material is only 1/10 or less of the ordinary glass, the green band of the super white glass is less absorbed in the glazing of the visible ultra-white glass, ensuring the consistency of the glass color.
  3. The visible light transmittance is high, the permeability is greater than 91.5%, with clear crystal quality. With ultra-white glass, the exhibition product is much clearer in people’s eyes, and it can highlight the authentic original appearance of the exhibit products.
  4. High market, strong profitability, production control is complex, and relatively strong profitability. The higher quality determines its higher price, which is 1 to 2 times the ordinary glass. The cost is not instead that high as regular glass. The technical barrier is relatively high, with a high value.

exhibit glass

The primary category of ultra-white glass

Solar ultra-white patterned glass

Solar ultra-white pressure glass components can maximize solar cells’ radiation heat and significantly increase the photoelectric conversion efficiency of solar cells. This glass can simultaneously resist the radiation of the solar ultraviolet rays, but the light transmittance does not decrease, which is more efficiently extending the cover glass’s life.

Ultra-white transparent flat glass

Ultra-white transparent flat glass (commonly known as “crystal glass”) is a new type of transparent flat glass product developed and manufactured, which uses high technical means to oxidize during the preferred and processing of raw materials. Iron is effective in plate glass, having a very low iron compound in a fuse and forming process of the flat glass. Ultra-white transparent flat glass has similar appearance characteristics with colorless crystals. No matter from the front or the side, there is no green visual effect as the generic flat glass, and it is also better in the level of transparency.

Curtain Wall

How to choose glass types for building glass walls and roofs

Building Glass Performance with the perfect quality of manufacture and performance of the product, glazed external walls are used to maximise natural light within rooms, further reducing the running costs of these highly energy-efficient homes.

Low U-values of insulated glass

Excellent thermal insulation was also part of the performance. The low U-values delivered by our insulated glass ensured impressive low energy performance, which helped the development achieve the Code for Sustainable Homes standard. We exported many containers of the glass roof in recent years. I think our skylight price is competitive as importing cost is not too much. We know the retail skylight price may be ten times compared with our quotation in the retail market.

skylight glass

Our glass rooflight competitive in low U value (Triple glazed U value 0.8 even Quad glazed 0.58). Established in 2000, we exported large quantity glass products in the past 18 years. Our direction is to focus on branded glass products, be a Strategic Partner with Pilkington, and mainly supply building glass to famous real estate companies in China. As building glass quantity is huge but requirement strictly, we can’t get approval from them unless top quality.

What is reflective Glass

We also provide reflective glass for commercial and residential buildings.

Coated reflective (including heat reflective glass, low-e glass (Low-E), conductive film glass, etc.)
Reflective glass, also known as reflective glass. Coated glass is to coat one or more layers of metal, alloy or metal compound film on the surface of the glass to change the optical properties of the glass to meet certain specific requirements.

Heat-reflective glass is generally coated with one or more films composed of metals such as chromium, titanium or stainless steel or their compounds on the surface of the glass so that the product is rich in color, has an appropriate transmittance for visible light, and has a higher resistance to infrared reflectance, it has a high absorption rate of ultraviolet rays, so it is also called solar control glass, which is mainly used in construction and glass curtain walls;

Low-E glass (Low-E) is a thin film system composed of multiple layers of silver, copper, tin and other metals or their compounds coated on the surface of the glass. The product has high transmittance to visible light and high reflectivity to infrared. It has good heat insulation performance and is mainly used in construction, automobiles, ships, etc. Due to the poor film strength, it is generally used as a hollow glass. The heat passing through the glass is bidirectional; that is, heat can be transferred from indoor to outdoor and vice versa, it is carried out simultaneously. It is only a problem of poor heat transfer. In winter, the indoor temperature is higher than the outdoor temperature, and insulation is required.

building glass

In summer, the indoor temperature is lower than the outdoor temperature, and glass must be insulated. Low-E glass can keep heat and heat insulation. The visible light transmittance of Low-E glass ranges from theoretically 0%-95% (it isn’t easy to achieve with 6mm white glass), and the visible light transmittance represents indoor lighting. The outdoor reflectance is about 10%-30%, and the outdoor reflectance is the visible light reflectance, which represents the intensity of reflection or the degree of dazzling.

Two current production methods of Low-E glass

Online high-temperature pyrolysis deposition methods, such as PPG’s Surgate200, Ford’s Sunglas H. R”P”. These products, are completed during the float glass cooling process. Liquid metal or metal powder is sprayed directly onto the surface of the hot glass. As the glass cools, the metal film layer becomes a part of the glass.
The main advantage of the offline vacuum sputtering method is that the “U” value of the “Low-E” hollow glass produced by sputtering is better than that of the pyrolysis product. Still, its disadvantage is that the silver oxide film layer is very fragile.

20th years in the industry

Celebrating 20th anniversary of Blue-Sky Safety Glass establishment

This year is our 20th anniversary since Blue-Sky Safety Glass company was first established in 2000. we’ve been through ups and downs along the way. Being in the manufacturing industry means consistent improvement on the cost-effective products and solutions for clients, dealing with the balance between the maximum capacity and incoming orders, following the marketing trends to fulfill the needs…

We’ve moved to a new manufacturing workshop in 2014 for better production environment and transportation. below is what it looks now:

factory birdview

We started manufacturing and selling glass products to clients most of them were local house builders. With the reputation growing, the production line expanded to furniture glass products. The glass types included tempered glass, laminated glass, screen-printing glass, insulating glass of international standards, which are widely used in building, partition, decoration, or furniture for both household and commercial purpose.

And you can see a lot more of our product gallery through this link: https://www.hzltglass.com/cn/

glass partition

Over the years, we invested heavily in equipments and staff training to ensure the quality.

advanced equiments

Then we began manufacturing digital printed glass, which are more fashionable and customizable, it can be used for door, window, curtain wall, partition for industrial, commercial and residential buildings, museum, subway station, furniture and table top… we aim to give the clients more options of sourcing from us.

Digital printed glass products

Lantin Brand – From Blue-Sky Safety Glass

We have set up a new production line focusing on bath showers and enclosures and its brand – Lantin.

As a sub-brand of Blue-sky Safety Glass, Lantin shower and enclosures has evolved into a premier manufacturer of shower doors and bath enclosures since its founding. We have perfected the fine art of customizing glass shower doors that conform to your specific measurements which have allowed us to grow our business every year.

Shower enclosure

Leapcarpio Company

In 2020, we’ve founded another company – Leapcarpio, is this name a little different from others?

Here is the interpretation, in our culture, carpio means being persistent, positive, and loves to meet challenges, each staff here should behave like carpio leaping high out of the water, full of enthusiasm to get into the work.

The main goal is to offer better service to those in desperate need of sourcing relevant products besides the products we were allowed to provide. We can provide a full line of glass products from regular glass to special purpose glass, and wild selection of its related accessories. You can ask for anything from building materials to decorative materials including finished products regarding the building industry, and you can also source from office supplies to home appliances.

Celebrating Our 20th Anniverary

Celebrating anniversary

This October, we had 20th anniversary party, most of the attending staff have been working in the company for more than 10 years who witnessed the rapid growth of the company.

We appreciate your support and trust in the past years, you can be sure that the products you purchuse from us will always be of good quality and good service.

New Machine Introduced to Safety Glass Supplier – Blue-sky Glass

In order to cover the increasing demands of various type of glasses with different applications. Blue-sky Safety Glass has involoved and installed new machines recently, as being a leading safety glass supplier, pursuit customer satisfaction is our most priority.

If you were looking for a reliable manufacturer for your glass products/projects, you are in the right place. Now let me introduce our newly sourced machines:

Autoclave for laminated glass

Glass-laminating autoclaves are used to bond and cure laminated “safety glass”. We have another bigger autoclave for laminating. This new one will speed up the safety glass production time.

laminating glass

The price of laminated glass

People always ask the price of laminated glass, our answer is “it depends”,its regular prices range from $10 to $100 according to the thickness, sizes, colors and brands of the glass PVB material.

If you have specific requirement, you can ask us by this link.

Ceramic roller coating machine

We already have another one too. The purpose of adding one more coating machine is for better quality control and short time delivery. This machine allows large amount of color printing, and it helps fine control the paint thickness within a set range.

roller coating glass

The color customization, as an important customize option, a professional safety glass supplier can customize colors for your special needs.

Single line polishing machine

It is a kind of precise and efficient glass linear edge grinding equipment. With this new polishing machine, you can ask for and order many sizes as your special requirement. It is an ideal choice for architectual glass, glass doors and windows for your building project.

glass edge polishing

Safety Glass Supplier for 20yrs

Blue-sky Safety Glass always tries its best to provide good quality products and excellent service from the establiment in 2000.

We are one of the leading glass processors, laminators and painters in the Mainland of China. For all you need in glass we can supply. With pursuit of best price with best quality, Blue-Sky safety glass products have been spread over every corner of the world with a list of loyal customers.

The equipment to make quality custom tempered glass

Advanced custom glass production line

The Blue-Sky Safety Glass introduced an advanced edging and beveling production line recently, it can do tough tempered glass customization processing automatically, and it is a fully equipped multipurpose machine which can be used for cutting, edge profiling, polishing and chamfering straight edges easily and efficiently.

Below is the detailed specification of this processing glass equipment – polishing and chamfering auto machine :

  • maximun size: 1300 * 2400mm
  • minimum size: 240 * 600mm
  • Daily Capacity: 4000 square meters
  • Glass processing procedure for edging and bevelling automatically
  • Saving glass usage and lowering the cost

Blue-Sky Safety Glass is the leading glass processors

In past 17 years, we mainly supply building glass to domestic famous real estate companies and have grown vigorously, we have had the advanced CNC machinery installed, giving us the ability to manufacture our own custom tempered glass products to the highest quality and cost-effective performance.

In 2018, we have invested 2 millions to upgrade the glass production equipment, including digital glass printers, glaston tempering furnace, polishing and chamfering auto machine. The new investment on the equipment ensure us continue to stay on top of the glass deep processing industry in China.

If you are going to source the glass products in China, wait a moment to decide who to be your supplier, ask for the equipment list file from them, it really matters to the quality and price.

glass production workshop video