What’s the difference between double glazing and triple glazing?

 Most glass used in facade is double glazed units, which is made of 1 piece low-E coated glass and 1 piece clear glass,the most common glass combination is 6 low-E+12A+6 clear glass.

If the low-E coating is double silver low e coated,glass U value is around 1.6W/m2.k,for triple silver low-E the U value is same but will with lower Solar coefficient.Evne if we change the 2nd glass to double silver low-E,the U value won’t change much.

lowe-coated-glass-morn-bm

With the development of energy saving conscious,triple glazed units is widely used in developed countries ,such as Europe and North America areas,the cold area has higher heat conservation performance.
Compared with double glazed units,triple glazing has much lower U value ,glass made of 1 piece low-E and 2 lites clear glass U value can decrease to 1.2W/m2.k.Of course we have many options to decrease the U value again,such as increasing the iar gap ,fill argon,using warm edge spacer,and using 2 piece low-E glass.
The main difference between double glazed units and triple glazed units is U value,here is the comparison between different combinations.

triple-glazed-units-U-value

As shown in above chart,triple glazed units can decrease 20-30% U value,taking advantage of more method,the U value can decrease 100% again ,the glass will be applied in passive buildings.
Morn is your turnkey insulated glass manufacturer and supplier from China,welcome contact us for more info.

Download this article here:What’s the difference between double glazing and triple glazing

By MORN|November 24th, 2019|Insulated Glass|0 Comments

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What’s the thermal conductivity measurement unit?

 When evaluating the thermal insulation performance of a glass product,we usually know that clear& tinted single piece glass is 5.84,Single silver low-E insulated glass 1.8,and double silver low-E is 1.55-1.65.The lower the value,the better thermal insulation performance the glass has.

But What does the value mean and the measurement unit?
Actually the measurement unit is W/M2.k,which means watt/square meter/Kelvin,it’s under same confirmed air condition,the heat transfered throught the glass products.
While even this measurement unit,there’re many different conditions depend on different client.

insulated glass-heat transfer-morn bm

 

The most widely used condition is American LBNL Ashare NFRC 100-2010 SUMMER standard:
Room temperature: 24°
Outside temperature: 32°
Glazing oriented windward, wind speed: 2.75 m/s
Sky temperature: 32°
Sky emissivity: 1.0
Incident solar power: 0 W/m2

NFRC 100-2010 winter standard:
Room temperature: 21°
Outside temperature: -18°
Glazing oriented windward, wind speed: 5.5 m/s
Sky temperature: -18°
Sky emissivity: 1.0
Incident solar power: 0 W/m2

While in European areas,they use another standard:EN673,there’s no summer and winter difference as there’s not big difference between winter and summer temperature.
Despite W/M2.K,there’s another measurement unit that shows the thermal conductivity :ft2•h•°F/BTU ,which means hour/square foot/°F.
It’s quite different unit.Sometimes clients mentioned glass unit is 0.3,many sales don’t believe this and think it must be incorrect and the glass U v value couldn’t be this low.While what the client mentions is hour/square foot/°F,not W/m2.k.
To transfer the unit, 1hour/square foot/°F =5.68w/m2.k,so don’t make mistake.
Morn is your turnkey architectural glass manufacturer supplying all kinds of tempered glass,laminated glass and insulated glass,welcome contact us for more info.

Download this article here:What’s the thermal conductivity measurement unit?

By MORN|November 29th, 2019|Curtain Wall, Others|0 Comments

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Glass table top: Advantages,glass options and maintenance

 Whether it’s side tables,coffee tables,dinning tables,leisure tables,writing desks,office tables,glass can be used as the table tops ,glass table tops is becoming more poplar in decorating your house.Here we introduce the advantages,glass used in glass tables and maintenance guide for your glass table.

glass table tops-coffee table-morn

Advantages of glass table tops.

1. Compared with wooden table tops,glass is not affected by the air,it won’t deform due to unsuitable humidity.
2. Compared with fabric and leather tops,it’s more easy to clean and maintenance,and occupies little space.
3. Compared with plastic tops,glass is more environmental friendly,no pollution,no emissivity.
4. Glass itself is more fashion with variety shape,as well as shining appearance,rectangle,oval,irregular shape.
5. Glass tables is easy to combine with other furniture,the simple and clear lines,transparent visual effects make it stand out.

glass tables with pet rest room-morn

Glass options used in the glass tables:

1. Classification based on processing:Hot bending glass and tempered glass,laminated glass.

Even though Hot bending glass strength is not good as tempered glass,but the special processing technology makes hot bending glass unlimited shapes and styles.Hot bending glass can be made into small radius,90 degree,double curved glass,which cannot be achieved by tempered glass.

hot bending glass tables-morn-china

Tempered glass is the most common glass types,it has strong resistance to stress, cold and heat, and impact.The advantages of toughened glass in terms of safety, high strength and thermal stability are not available in float glass. At the same time, its price is not expensive.

conference room-glass conference table-morn

Laminated glass is made with 2 piece glass,whether it’s clear float glass or tempered glass,the advantage of laminated glass is,once any piece glass broken,the interlayer will bond the broken pieces to avoid glass collapse,and injury to people.of course its price is relatively higher than same thickness tempered glass as processing is much more complex.

laminated glass table top options-MORN

2. Classification based on glass colors:translucent glass ,translucent glass,and opaque glass.patterned glass,back painted glass,ceramic frit glass.Clear float glass,or low iron glass is popular because of its clear appearance.People can easily see through the glass.

end glass tables with clear float glass-low iron glass

Sometimes to compatible with the house overall decoration color tone,body tinted glass is preferred,especially grey tinted glass,bronze glass,green glass, and blue color glass,these colors are usually in dark tone.

body tinted glass tables-coffee tables-side tables

3. For some reason,customers don’t want to use translucent table tops but to select translucent ,and even opaque glass to make it difference,these glass include patterned glass,back painted glass,ceramic frit glass.Especially the ceramic frit glass,with patterns,whether it’s lines,dots ,all make it different.

Glass tables-coffee table with back painted glass-MORN

ceramic frit glass table tops-morn

coffee table-patterned glass table top-body tinted glass table

The glass used as table tops are always with polished edges, pencil polished edges,bevelled edges to make the glass edge shine and safety.Round corners are also available to protect people,and sometimes with holes on it to fix on the base.

glass edge-round corner-bevened edge-polished edge-pencil edge

straight polished edge-pencil polished edge-ogee edge

Glass table maintenance:

Actually glass table tops has very very low maintenance requirement,just keep the glass clean timely.

glass dinning tables-tempered glass-morn

1. If glass get mildewed after long time ,move the table to a well-ventilated place, and an electric iron should be used for 2-3 minutes in a place with mildew stains until the mildew stains disappear.
2. Wipe glasswith a wet towel or newspaper. If you encounter stains, you can wipe it off with a towel dipped in beer or warm vinegar,alcohol,or salt water. You can also use one currently on the market. Special glass cleaning agent.
3. Avoid hitting or impact the glass corners,glass corners is the weakest point of the the glass.If you got children in home,protect the corner with specialized corner protectors to avoid injury.

DIY your unique glass tables.

Despite purchasing the glass tables directly from your wholesalers or furniture sellers,users can DIY their own glass tables.The core concept of DIY tables is the table base should be strong to support the glass ,absolutely flat to hold to avoid falling down,flexible space and don’t affect legs activity.

Based on above concept,people can use stones,tree stumps,steels tubes,and even oak barrels to DIY their tables,below are some samples you can take as reference.

DIY glass table-toughened glass

tree stumps-oak barrel-glass table-DIY

Stone glass table top-stone desk

Download this article here:Glass table tops Advantages,glass options and maintenance

Select the right Secondary sealant for your insulating glass

 Insulating glass has been widely used in commercial buildings, shopping malls, high-rise residential buildings and other buildings, with excellent heat insulation, energy saving, sound insulation and other properties. The secondary sealant used insulating glass plays an important role in maintaining the stability of the insulating glass structure, and greatly affect the quality and service life of the insulating glass. The insulating glass structural sealant is even directly related to the safety of the curtain wall.

insulating glass structure

The structure of insulated glass

Two pieces of glass are separated by a spacer, the spacer and the glass are first sealed with butyl, which can prevent water vapor or inert gas from entering and exiting the cavity. But the butyl rubber itself has low bonding strength and low elasticity. the spacer is filled with molecular sieves, and the gap between the edge of the glass and the outside of the spacer is sealed with a second sealant.to maintain a good structure when under load.

What are the problems caused by improper selection of the secondary sealant for insulating glass? This article summarizes the hazards into the following two categories: the thermal insulation loss of the insulating glass ,and the safety application of insulated glass.

The defect of using bad quality sealant

The main manifestations of this type of problem include the phenomenon of “rainbow” and “oil flow” in insulating glass. The phenomenon of “water accumulation” and “condensation”, slippage of insulating glass spacers, etc.

1. Rainbow Rainbow is a kind of oil film that appear inside the insulated glass,see below picture:

rainbow -oil film inside insulated glass-quality problem

2. Oil flow .Oil flow means the PIB inside the glass have oils or dirty.

insulated glass-oil flow

The above two situations are related to the filling of “white oil” in the secondary sealant. “White oil” is commonly known as mineral oil. Mineral oil is a hydro-refined petroleum fraction, which is mainly a mixture of saturated naphthenic and paraffinic hydrocarbons. Its chemical structure is obviously different from that of organic silicon materials and has poor compatibility with silicone sealants. , It will migrate and ooze after a certain period of time.

The “rainbow film” phenomenon is caused by the migration of “mineral oil” into the inner cavity of the insulated glass; and the reason for the “oil flow” phenomenon is that during the migration process of “mineral oil”, the primary butyl is dissolved, resulting in Black oil spots or oil stains.

These “mineral oils” may come from the secondary sealant for insulating glass, and they may also come from the weather-resistant sealant or door and window sealant that is in contact with the secondary sealant.

insulated glass quality problem-oil paint inside glass

Above picture shows the rainbow film caused by the oil.Since the weather-resistant sealant is in contact with the second insulating glass sealant, the “mineral oil” in the weather-resistant sealant migrates to the second insulating glass sealant, then to a butyl, and finally to the inner cavity of the insulating glass.

insulated glass quality problem-PIB dissolve

The door and window sealant is partly in contact with the glass secondary sealant, so the “mineral oil” in the door and window sealant migrates to the secondary insulating glass sealant in contact with it, and then migrates to the PIB, which finally results in lprimary butyl is dissolved and oil flow occurs.

Actually the mineral oil are not only exist in the weather-resistant sealant,but also the glass secondary sealant.For competitive market,some sealant manufacturers sacrifice the product quality and performance,mineral oil was added into the product to decrease costs.The bad quality sealant will cause oil paints,low bonding effect with the PIB,and even compatibility problem with the PIB.That’s what we;ll discuss below:

3. Glass dew or condensation.

The phenomenon of dew and condensation of insulated glass refers to the water vapor entering the cavity condenses into dew or even water after the glass lost its sealing effect,and thermal insulation performance.

insulated glass dew-water inside glass-morn

4. Slipping of insulating glass spacer

The slipped spacers means that spacers and the second sealant are not well bonded, and they slip in the cavity due to internal stress.

spacer slipping inside insulated glass

5.Falling of insulated glass.

There’ll be some safety risks that caused by improper sealant,especially the falling of insulated glass from the buildings.

glass falling down from buildings

In 8^th,July,2011, one piece glass falled from 21^st floor in Hangzhou ,the falling glass hit a girls leg and caused amputation.The reasons of glass falling is,the improper using of secondary sealant of the insulated glass,the glass used polysulfide sealant but not structural silicon sealant.

Polysulfide sealant has poor UV aging resistance. If polysulfide sealant is selected as the second-sealant i, the bonding surface will be exposed to sunlight for a long time, and the bonding effect will decrease and cause glass falling down.

What kind of secondary sealant should we use in glass for projects?

For different curtain wall systems,our suggestions are below:

1. Point supported glass facade:Must be Structural silicon sealant .
2. Hidden frame curtain wall,semi framed curtain wall:Must be Structural silicon sealant .
3. Large area stick curtain wall:It’s suggested to use Structural silicon sealant .
4. Windows,doors,normal stick curtain wall:Silicon sealant,polysulfide sealant.

insulated glass production-morn

What methods should we should take to guarantee the sealant quality?

a: Before insulating process, confirm that the sealant has a good bond with the substrate, and conduct a bonding test and compatibility test;

b: During the processing, continuous extrusion test (snake test), butterfly test, and break time test should be carried out;

c: Check the quality of the sealant injection, it should be full and dense to ensure that the sealant is fully in contact with the butyl glue and flush with the glass edge;

d: In order to confirm the bonding quality of the sealant and the substrate, the finished insulating glass should be subjected to a tapping peel test.

finished insulated glass-MORN-CHINA

What sealant brands we can use in China？

The popular sealant brands in China include Silande,Lingzhi,Baiyun,Guibao.All these factories has good quality to ensure the overall insulated glass performance and safety.

Morn is your turnkey insulated glass manufacturer and supplier in China,welcome contact us for more info if you got problem purchasing insulating glass from China.