1 Interior Glazing Program Part I

1 Interior Glazing Program Part I


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Hi, I am Sanjeev Chaubey from Saint Gobain. Welcome to NPTEL online Interior Glazing Program. Today, we will discuss about glass fixing
accessories in Interior Glazing Application. The objective of this program is to understand
the product portfolio of glass fixing accessories; then the method of application, and then selecting
the right products as per the standards of the industry. So, let us first understand the product portfolio
of this category. When, it comes to the glass fixing the first
and most commonly products come in picture is silicone. So, there are 2 type of silicone. One is known as the colored silicone, which
is available in black grey and white color. The, another category is a clear silicone. So, we will discuss in detail that what kind
of silicone, what are the standards? Then, the second product comes in is known
as double sided tape, which is commonly used for a fast fixing solution in industry for
lacquer glass as well as mirror. Then the third product comes in this category
is known as clear partition tape, which is commonly used for a glass partition. Because, nowadays most of the partition in
office space is being done by the help of glass so, there we need some kind of solution
which can be used for a glass partition. So, there we use this clear partition tape. Then, product comes in is basically a masking
tape. Masking tape is supporting element to use
with this silicone as well as this Ferro mounting tape. We will discuss in detail that what kind of
standards are there for these product. And, how the product needs to be employee
needs to be applied to the glass, for a better result for a better aesthetics and without
compromising on these standards. So, first we will understand what happens,
when we do not use a right product and a right method of application of glass fixing solution. So, we will see through a few defects which
comes in this category. The first defect which is known as mirror
corrosion, now why this mirror corrosion is happening is again because of incompatible
adhesive. When I say incompatible adhesive it means
the adhesive, which is being used to fix that glass was not compatible to the back paint. Because, any of the lacquer glass which comes
under this category has some kind of coating at the back of that glass, if that adhesive
is not compatible to the paint of course, it will react with that paint and it will
take off the paint from that back painted glass surface. Result is in front of you you can see the
corrosion is happening in at the back of the mirror. So, this is a most common defect come in this
category, which is happening because of an incompatible adhesive use at the back of the
glass or while fixing the glass. Second effects comes in this category again
is a bigger picture of that defect which is known as paint removal a larger surface of
that paint is being removed. Again, what the reason behind this is the
same thing the incompatible issue or the improper application of that adhesive. Because of that the paint get removed from
that surface causing a bad aesthetics appeal which should not be there. Then, the third pictures you can see there
are 4 different type of glass placed here, you can see every where there are some defect
at the back of the glass surface. These all glass surface defects are happening
because of the incompatib[le]- adhesive used in this category. So, let us have a look on this ah common defects
which are coming in this area because of incompatible adhesive used or improper way of application
of glass fixing accessories. As, you can see the first is edge corrosion
edge corrosion happening because of the improper application of the adhesive. The second you can see is mirror corrosion,
that is again because of incompatible adhesive used in fixing mirror. The third you can see paint peeling off. Here the most common defect which is being
happening in this area is because of incompatibility of adhesive used. So, these problems are basically alarming
us not to compromise on standards. So, while going for this glass fixing accessories,
we need to look into some standards. Which are set by this industry? So, let us have a look on the standards, what
are those standards which need to be added by going for a glass fixing accessories. The first standard comes in picture is known
as the VOC complaint 90 percent of the product which is being used in this glass fixing category
are mostly voc emitting products. When, we say voc emitting product means they
will be emitting volatile organic compounds, which is ultimately going to hamper the internal
environmental. I mean the air in which we are going to breathe
in will be hampered because of this VOC components I will explain you in detail. The second components comes is bond strength. While fixing a glass bond strength is very
very critical category, very very critical element to look into it. Because, if the strength is not proper the
glass will get down after a period of time, resulting glass crack or maybe the glass break
is even. The third category, the third element which
comes in the compatibility, which is again the most critical element of this glass fixing
solutions; if that glass fixing adhesives or the ah tape which is being used is not
compatible to the back paint again it will take off that paint, and it will result in
a bad aesthetic appeal of that interior structure. Next the things come in amount of adhesive
which is being used. Because, if you are using less amount of adhesive
again it is not going to fix the glass in a proper way, if you are going to use the
higher amount of adhesive the undulation the unbalancing thing will happen at the back
of the glass again resulting in glass breakage or glass getting down from the placed area. So, we need to look into this area. Then the adhesive application, the way we
are applying adhesive that is also critical element of this glass fixing category. So, all these critical elements need to be
taken care of when we are going to select a glass fixing accessories or any of the glass
fixing products. So, let us start first with silicones. As I shared with you silicones there are 2
type of silicones available in market; one is the colored silicone, colored mean to say
there is a variety of color which commonly comes in black, grey or white. Then the third ah another category is known
as clear silicone. So, depending on the application of the product
this different type of silicone can be selected can be opt, we will discuss what kind of silicone
when to be used. So, when we are going to say silicone the
first component as we discussed that VOC compliant. The silicones must be of neutral base. When I say neutral base actually in market
there are different type of silicones available. Mostly silicones comes under the Acetoxy category,
when I say acetoxy category means, while applying on the back painted glass on the painted glass,
it will react with that paint and emit some VOC complaint with some acidic background,
which will again hamper the interior environment the air equality of interior, which is not
good for our health. So, the recommendation here considering this
VOC complaint is we must use silicone which is of neutral base or that category or that
grade is known as Alkoxy. So, one is Acetoxy which is going to emit
acids, the another is Alkoxy which is basically going to emit alcohol base smell, which is
not that long lasting it will disappear in a period of time. And, there is no hazardous impact on our interiors
I mean atmospheric air. So, the recommendation here is we should use
alkoxy silicones. Then the second point comes in bond strength,
as we discussed higher the bond strength higher the life of the glass stability. So, the recommendation here is the glass ah
bond strength of this fixing adhesive must be of 450 kpa, because if the higher the ah
strength it will hold the glass properly and it can hold the higher thickness of glass
as well. Mostly glass in this category is used for
6 or may be 8 mm of thickness. So, 450 kpa bond strength is more than enough
to hold that much glass thickness. The next point comes in is basically the compatibility. The compatibility part covers 2 aspects; one
the silicone which is going to be used must be compatible with all kind of glasses. When I say all kind of glasses means mirrors
which does not which have a different kind of back coating, then the back painted glass
which has a different kind of back painted. So, the silicone which is going to be used
in this category must be compatible with mirror as well as back painted glass. Apart from the material where it is going
to be used there is a substrate compatibility. When I say substrate means the surface where
we are going to fix the glass, you can see here the first as I discussed mirror which
is a object which is an object where glass fixing solution need to be applied. Second, plywood which is basically a substrate
so, when you are selecting a silicone, it must be compatible with plywood as well as
fibre cement as well as MDF board. Because, the substrate varies from customer
to customer, project to project, few people will use plywood few people will use MDF board
few people will use wall I mean the fibre cement thing. So, whatever the fixing accessories coming
in picture must be compatible with all kind of substrate. Next to the substrate the things come in silicone
is the colors available in this market. So, basically there are 3 type of colors available
in silicone category; number one is black, then grey and then white. So, it depends on the application that where
we are going to use the silicone that color will be chosen as for that. Let us say if we are going to use silicone
in exterior category mostly we will be using black silicone, where the color is going to
match the glass or we need not to see the you know partition. The second category like grey and white mostly
being used in back painted glass when we are going to fix the mirror or a back painted
glass we can use this ah white and grey category. Clear silicone is mostly used when the clear
glass is being fixed. So, that clear silicone will match to the
clear glass and will maintain better aesthetics. Then apart from this most important thing
is coming the curing time. Whenever we are going to select silicone curing
time is the most critical time. Curing times means, how much time it will
take to hold the glass with the substrate hold the glass means fix the glass. Initially when you are going to fix the glass,
we will fix that of with the help of silicone then we will place masking tape. So, that it will hold the glass for sometime
after that it will be cured. So, the time which is being taken to cure
that silicone to fix that glass to hold that glass to the substrate should be very very
less. In market we can see that there are silicones
available from 8 to 24 hours. Whereas the recommended time is 8 to 9 hour
the silicone, which is considering 8 to 9 hours curing time is considered as a good
silicone. Whereas, the holding time support time should
be around 2 to 3 hours. So, that glass can be placed and that can
be supported with the help of masking tape. That I will show in videos ah I mean the installation
video, where we will understand in detail that how this fixing time and ah this curing
time is going to happen in this application? Then, another part of this silicone usage
is related to the weather. As, we discussed in this category paint does
not hold and the silicone inhold some adhesive mounting tape also inhold some adhesive. So, all these adhesive must be weather compatible. It means there should not be any impact of
inside or outside weather conditions. Like in rainy season if some moisture is coming
it should not get peeled off it should not get detached from the substrate or from the
mirror part. So, the silicone which is being used in this
category must be of weatherproof silicone that is again one considerable element of
this silicone specification .


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