All answers to your most frequently asked questions.


Does pane side of double glass glazing influence acoustic performance?

No, the acoustic performance is the same regardless of the orientation in which the double glazing is mounted.



Can you accumulate acoustic and thermal performances?

The double glass range allows you to accumulate the 2 functions - see VIDUPLO® | LAMIGLASS ACUSTIC and VIDUPLO® | GLASS PLUS.



What is the effect of replacing air with another gas?

In the range of high-performance glass, air is often replaced with argon. The different acoustic measurements performed in laboratories showed that the influence of argon is small although in some cases it has marginal improvements.



What is the difference between VIDUPLO® | LAMIGLASS and VIDUPLO® | LAMIGLASS ACUSTIC ?

VIDUPLO® | LAMIGLASS ACUSTIC is composed of a PVB interlayer more insulating and elastic, from the acoustic point of view, continuing in the category of Polymer not being an Elastomer.



Does tempered glass have acoustic performances different from classic glass?

No, the temperind does not cause change in the acoustic performances, only mechanical properties.



What is the influence of chamber thickness on acoustic performance?

Between a thickness of 6mm and a thickness of 20mm, there may be a slight difference but in general is not very noticeable. (about 1-2dB).



Can comparisons be made in acoustic attenuation assessments?

Laboratory tests are carried out according to the UNE EN ISO 140-3 Standard for the isolation of airborne noise (which is transmitted through the air). The weighted global values ​​of acoustic insulation indices are calculated according to the UNE EN ISO 717 standard. Its results are expressed as:


1. Airborne noise insulation index in Rw


2. Weighted noise reduction index in Rw (C; Ctr), where:


· Rw + C = Weighted index of noise reduction to pink noise

. Rw + Ctr = Weighted noise reduction ratio for traffic noise


From what has been mentioned previously we can say that the results thus obtained can be compared in their global values. However, depending on the frequency (Hz) of the noise to be attenuated, the indices are variable and the behavior of the different materials and compositions depends on the frequencies referred to.




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Preconception for bullet resistant glass in the exterior?

The performance of VIDUPLO® | Bullet resistant LAMIGLASS PROTEKT may vary depending on temperature. It is therefore recommended to use this glass as the inner glass of a double glass composition which integrates a solar protection glass (VIDUPLO® REFLEKT or VIDUPLO® SOLAR CONTROL).





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Is there a sense of installation?

The glass of the composition of the double glass on which the solar control cover is deposited is the external glass.



Does solar control glass block UV rays?

No. However, they can be blocked almost entirely by the use of laminated glass in the VIDUPLO® range | LAMIGLASS which transmit only 0.4% of the UV.



What is the solar factor?

It is the relation between the total amount of energy that enters through the glass coming from the incident flow. It is the sum of the direct solar transmission, plus the one absorbed by the glass and irradiated in the interior.



What is energy absorption?

It is the percentage of solar energy that the glass absorbs and that generates a temperature rise in it. This value is indicative of the risk of breakage by thermal shock.



Does the position of the glass matter in a double glass unit?

In the case of incorporating cover glasses (solar control, low emissivity, etc.) and although there are generally not large differences, the best performances are achieved with the proper position and in no case can the cover be exposed to the exterior of the unit. double glass. It should also be taken into account if the double-glazed unit incorporates safety glass (laminated or tempered).

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Which glass blocks UV rays?

Laminated glass in the VIDUPLO® range | LAMIGLASS only transmit about 0.4% of UV rays, according to their composition. However, UV rays are not alone responsible for discoloration: certain colors are equally sensitive to visible radiation (light).



What is the glass that allows not to be seen from the outside?

Products specially developed for this application are VIDUPLO® | PLUS S08 / S10 / S20 and for certain applications of VIDUPLO® | PRIVA GLASS or VIDUPLO® | SMART GLASS. In addition, glass with poor light transmission and strong light reflection, see range VIDUPLO® | REFLEKT and VIDUPLO® | SOLARCONTROL - allow different levels to respond to this function. However, this only occurs in the sense that light is more intense from the outside than from the inside.



How do you avoid sun discoloration?

Laminated glass reduces the passage of ultraviolet rays, causing discoloration, by more than 95%. If you want to ensure 100%, you should use thicker PVB laminate with double or triple glass systems.



What is light transmittance?

It is the percentage of light energy that is transmitted through the glass, from the incident light flux.



What is light reflection?

It is the percentage of light reflected from the incident light flux.



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How does the thickness of the chamber affect thermal insulation?

The thermal transmittance (value U) has an inverse relationship with the thickness. By increasing this, radiation transmission decreases, so the U-value decreases. This is valid up to a chamber thickness of 15-18mm, from which the air currents that create inside it increase the energy transmission.



How to select the thickness of the chamber in a double glass unit?

Regardless of the incidence of the thickness of the chamber in the U-value (see previous note), this should be related to the thickness of the glasses, the dimensions and area thereof, to ensure a minimum separation between glasses, at all times.



What is the advantage of using cover glasses?

They allow for better lighting and energy control, resulting in greater comfort and savings. Basically, solar control (energy reflectance), low emissivity (reduce transmission / energy losses) and high performance or selective both functions. To achieve the low emissive effect, these glasses must always be incorporated in a double glass unit.



Why are advertising information with "U" values ​​in Kcal / m² ° C and in other cases in W / m² ° K?

It can only obey the interest of that, as the value in Kcal. is lower than the value in W, it appears superior when it is not. The European Standards consider the value U (equivalence of value K) in W / m² K.


Is it true that a low emissivity glass provides more freshness in the summer and more heat in the winter?

A low-emissivity glass by itself, does not provide more heat in the winter or more freshness in summer. Its main function is to prevent the energy generated in the interior (whether of cold and / or heat) if it "escapes" to the outside , thus achieving lower energy consumption and thus an economic saving.



Does the position of the glass matter in a double glass unit?

In the case of incorporating cover glasses (solar control, low emissivity, etc.) and although there are generally not large differences, the best performances are achieved with the proper position and in no case can the cover be exposed to the exterior of the unit. double glass. It should also be taken into account if the double-glazed unit incorporates safety glass (laminated or tempered).



How do you avoid condensation?

Condensation is a physical phenomenon that depends on the existing ambient humidity and the temperature of the glass, therefore, the circumstances can always be given to it to occur. In any case, to reduce the risk, one can resort to the use of low glass emissivents that cause the inner glass of the double glass unit to remain at higher temperatures. This is only possible with double or triple glass systems.



How to check that the cover is well present on one of the glass?

The presence of the cover can be visually checked by observing the four images of the flame of a lighter reflected on the glass: the color of the image reflected by the cover is different from the others 3.



What is the interest of Argon Gas? How to check the presence of Argon Gas? What is the life span of Argon Gas?

Argon gas appreciably improves the thermal performance of a double pane compared to air, particularly with low emissive glasses. Only the marking allows to check the filling of Argon Gas. Measurements of glass after 10 years of installation showed values ​​of gas loss of less than 1%. Glass is generally considered to lose less than 5% gas during 25 years of installation in a building.


VIDUPLO® | Does GLASS PLUS make sense for installation?

Thermal performances are identical regardless of the installation direction. However, other functions can determine the direction of installation, such as solar control or intrusion protection.



VIDUPLO® double glazing | GLASS PLUS are more expensive than a classic double glass?

The price difference amounts to about 30%. Knowing that the annual economy realized in heating energy (fuel) is on average 4.4W / m² of glass. This means that this additional cost is amortized over 2 to 3 years. The following years are therefore pure benefit!



Outdoor condensation with VIDUPLO® | GLASS PLUS is normal?

This phenomenon occurs at night or at dawn on double glass with high thermal performance and essentially on nights without clouds and without wind. Under these conditions, under the effect of significant radiation to the celestial dome and the low thermal losses through the glasses, the temperature of the glass can drop below the outside temperature causing condensation. this will manifest itself first in the center of the glass and can extend to the entire surface. In conclusion, condensation on the outer face of a double pane is a phenomenon that can never be completely eliminated. this phenomenon occurs only under certain special conditions and constitutes evidence of the performance of insulation of glass.



Is a thicker glass more insulating?

No, the thickness of the glass has no influence on the insulation performances. In contrast, the thickness of the air chamber or argon of the double glass improves the insulation of this one. Thus, a 15mm chamber of argon will insulate better than a 12mm chamber (U value less than 0.3 W / m² K). However, this feature has practical limits and is more advantageous if it opts for an emissive low cover glass than exaggeratingly increasing the thickness of the chamber with argon. A double glass VIDUPLO® | GLASS PLUS that consists of a 12mm or 15mm camera offers good performance.



VIDUPLO® double glazing | GLASS PLUS benefit from the same 10-year warranty as classic double glazing?

Yes, the warranty is the same.



Seen from outside the appearance of double glazing VIDUPLO® | Is GLASS PLUS different from simple glasses or classic double glazing?

There is difference, however it is small and noticeable by few people. It can happen on façades, for example, that they are perceptible in a more pronounced way.


Difference between VIDUPLO® | GLASS PLUS and VIDUPLO® | GLASS PLUS S?

VIDUPLO® | GLASS PLUS is a high-performance double glass offering enhanced thermal insulation.

VIDUPLO® | GLASS PLUS S offers the same thermal insulation but also allows controlling solar gains.



Does the position of the cover (face 2 or face 3) on the double glass matter?

For VIDUPLO® | GLASS PLUS, the cover position does not matter about the performance of double glazing. However, on the same facade, it is important to install the double glazing with the cover on the same face. In contrast, the VIDUPLO® | GLASS PLUS S is always positioned on face 2 to obtain the performances mentioned in the documentation VIDUPLO® | GLASS.



When is it necessary to temper a glass?

A glass with a high energy absorption index under sun exposure can reach high temperatures. If the heating is not uniform - which usually occurs the differences in the dilation can break the glass. Tempered glass admits greater thermal differences between nearby points, so it is a guarantee against this phenomenon, which must be taken into account when the absorption exceeds 40%. The polishing of the edges of the glass reduces the risk, while the situation of partial shadows on the glass, existence of curtains nearby, labels, blind areas, currents of cold air, etc. are situations that empower you.





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What is the influence of the thickness of the butyral of a laminated glass on its mechanical resistance?

The resistance to breaking is not changed, however if this occurs, the butyral delays and reduces the possibility of intrusion.



Is the strength of a laminated glass equal to that of a plain glass?

The flexural strength of a monolithic glass is higher than that of a laminated glass of equal total thickness. The advantage of this second glass is that in case of break, the butyral keeps the fragments together, which contributes to a greater safety.



What kind of effort does the glass hold in a window?

Basically the pressure (or suction) of the wind. The method of determining these values ​​is indicated in the Technical Building Code (CTE) and depends fundamentally on the geographical situation, altitude and exposure.



VIDUPLO® glass | GLASS DUR is prescribed for its mechanical strength (5 times higher than that of non-tempered glass) and when safety consists only in avoiding the risk of cuts. VIDUPLO® glass | LAMIGLASS is prescribed for its resistance to infringement in the event of shock, adhesion of the glass over the PVB interlayer in the event of breakage, and to avoid the risk of falling into the void.



Is it normal to observe optical phenomena on tempered glass under certain conditions of private observation?

Yes, it is what we call "temperament," and Polarization. This phenomenon is not a defect and is inherent in the manufacturing process.



Can one replace a laminated glass with a tempered glass and vice versa?

Yes, but only from the point of view of the protection of persons from injury. Where protection against the risk of breakage is necessary, only laminated glass of a suitable composition is permitted.


VIDUPLO® | LAMIGLASS, does it blocks UV rays radiation?

VIDUPLO® glass | LAMIGLASS transmits only 0.4% of UV rays.



Can thermal insulation and protection be associated?

Yes, in this case we are talking about VIDUPLO® | GLASS PLUS SAFE for the composition that integrates VIDUPLO® | LAMIGLASS and VIDUPLO® | GLASS PLUS PROTEKT for the composition that integrates VIDUPLO® | LAMIGLASS PROTEKT in double glass.



Do safety glasses require their own frames?

Yes, it is clear that the frame on which the safety glass is fitted must have at least the same level of safety.



The assembly in insulated glass, on which side can place the laminated glass VIDUPLO® | LAMIGLASS?

VIDUPLO GLASS PORTUGAL recommends always placing the laminated glass on the interior side of the façade or building, in order to protect the inhabitants inside the house in case of breakage, Active Safety.



VIDUPLO® | GLASS DUR can be used in laminated compositions VIDUPLO® | LAMIGLASS?

Yes, in certain applications such as balustrades / guardrails, tempered glass mounted on laminated glass with thermoset glass should be used.





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UVA positioning recommendations UNE 85-222 describes the mechanisms for glass placement and mounting methods:



a. Frame


b. Support peripherical reeds


c. Support Chock


d. Sealing  system


e. Drainage opening Useful height


A. Discount 


B. Useful Width of Discount


C. Thickness support wedge


D. Nominal thickness of glass


E. thickness of the lateral wedge




The general principles of the State refer to:


Independence: The glasses should not have contact with each other,


Fence: Water and air permeability according to UNE and UNE 85-206. Compatibility between all the materials used (carpentry, glass blocks and contact glass-metal. It is recommended to use shims. 85-208. sealant).


Drainage: to prevent stagnation of water in the lower part of the joinery could affect the UVA seal assembly.


Fixing: The glass must be mounted in such a way that


Arrow: The arrow on the permissible frame must not be greater than 1/300


Storage: Insulating glass should always rest on the bottom of the changes that may affect any of its elements, in any case are transmitted to the rest. Like this:


The Glass Receptor racks should be flat and capable to resist the combined actions of the structural movement of the construction efforts.


The glass.


The frame profiles must be sufficiently sized.


Daffodils and other accessories should support glass


movements transmitted by it.


The elements which ensure the tightness of the must be sufficiently connected to allow the the differential movement between glass and structure, without breaking to seal it.


UNE 85-213.


two cups that form.


At work, it should be stored avoiding remaining UVA exposed to the sun and / or rain.





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How to avoid slipping?

Sliding can be reduced using a VIDUPLO® | GLASS DUR CONTACT.



What glass? How thick?

The VIDUPLO® | GLASS FLOOR responds to the placement of glass on the floor. The thickness is calculated according to the dimensions of the floor and the nature of the construction and its structure (housing, office, etc.).



To whom to address?

Installation on site requires special care and should be carried out by a professional - see glaziers.



How to make it translucent?

It is possible to make it translucent by using printed glass (VIDUPLO® | DEKORGLASS or VIDUPLO® | GLASS LAQUERED, polished (VIDUPLO® | GLASS SATIN) or screen-printed (VIDUPLO® | GLASS SERIGRAPH).



VIDUPLO® | DUR and VIDUPLO® | LAMIGLASS can be used on pavement?

Taking into account the fragmentation into small pieces of VIDUPLO® | GLASS DUR, monolithic tempered glass is not authorized for this application. Glass floors are always in laminated glass VIDUPLO® | LAMIGLASS PROTEKT.





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How to clean the inside of a double or triple glass, dirty or fogged?

It is impossible to clean the inner faces of a Double or Triple Glass, nor to suppress condensation. When this phenomenon manifests itself, it is necessary to replace the Double or Triple Glass and check the efficiency of the drainage of the Frame.



VIDUPLO® | GLASS CLEAN, does it work if the windows are shaded?

Yes, the self-cleaning function is activated as soon as VIDUPLO® | GLASS CLEAN is mounted outdoors, even in the absence of direct sunlight.



VIDUPLO® | GLASS CLEAN, does it work at night?

Yes, the hydrophilicity function of VIDUPLO® | GLASS CLEAN is active and prevents the formation of traces of drops in case of rain.



What is a self-cleaning glass?

The term self-cleaning means that the cleaning of the glass is effected or facilitated by the natural elements. Self-cleaning does not mean that the glass is "maintenance-free", particularly in the case of grease or significant air pollution.



When the self-cleaning function is activated?

In the week following installation and first cleaning, the self-cleaning property of VIDUPLO® | GLASS CLEAN activates progressively under the effect of ultraviolet rays of daylight. It is likewise after the concealment of the windows by taipals.




The VIDUPLO®  | GLASS CLEAN self-cleaning coating is fully integrated with the surface of the glass, its life is equivalent to that of other glass.



VIDUPLO® | GLASS CLEAN, does it work if protected from rain?

Yes, the photovoltaic process decomposes organic pollution and makes the glass hydrophilic. The cleaning thus is quite facilitated.



How to maintain VIDUPLO® | GLASS CLEAN?

A simple spray of water or a soft cloth soaked with water usually eliminates the hardest traces. As for any glass, it is preferable that the water be low limestone. For heavily soiled dirt, use hot soapy water or a usual non-abrasive glass cleaner.


What effect does the moisture have on the glass?

Generally the glass has a high resistance to the action of water and the atmosphere. However under certain conditions, the glass can be attacked, especially by alkaline solutions. In grouped plates, water can be introduced by capillarity, lightly attacking the surface with the result of a sodium solution which in turn will attack the glass. Thus, glass with moisture marks should be washed and dried before storage in a dry place.



Considering the existence of more than 25 commercial brands of double glazing with Quality Seal, is there any difference between their characteristics and / or their performance?

The truth is that equal compositions give rise to identical benefits and trademarks never imply a differential concerning quality as this is the patrimony and exclusive responsibility of the manufacturers themselves. Evident evidence of this is that when a manufacturer decides to change trademark, it does not see the quality of its products affected.




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