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					                                                                           Ceramic silkscreen painted glass glazed into IGU’s –
                                                                                              photo courtesy of Taiwan Glass.




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     07
     painted
     glass




     Painted glass is a popular choice of decoration   ceramic base painted glass
     for residential and commercial applications.
     Ceramic base painted glass remains the choice     Ceramic based painted glass is also known as ceramic fritted,
                                                       colourclad, ceramic backed or even opacified glass.
     product for spandrel panels in building facades   The paint is applied onto clear, tinted, patterned and reflective
     and for silk screen printed designs. How­ever,    glass (pyrolytic only). The glass is then heat strengthened or
     there are now­ a number of new­ paint mediums     toughened which fuses or bakes the paint to the glass creating
                                                       a permanent durable coating. The painted product can also be
     being applied to glass such as special
                                                       laminated for specialist applications such as overhead glazing.
     polyurethane and silicone based paints.           The paint is applied to glass by silk screen print, digital printer
                                                       or roller/curtain coater.


                                                       features and applications

                                                       0 Permanent, durable and non-porous;
                                                       0 Spandrel panels for matching or contrasting vision panels;
                                                       0 Door motifs (toughened glass only);
                                                       0 Decorative panels for kitchens, bathrooms, internal wall
                                                         cladding, partitions, shower screens, signage and furniture;
                                                       0 Automotive/marine and general transport glass,
                                                         incorporating dot matrix banding (for adequate sealant
                                                         bonding and protection);
                                                       0 Reduce glare or filter light with special patterned designs;
                                                       0 Wide range or colour options;
                                                       0 Can be laminated;
                                                       0 Paint is non reactive with the glass.


                                                       manufacturing limitations

                                                       Thickness (mm)            Minimum (mm)             Maximum (mm)
                                                       6                                 300 x 150              3000 x 2000
                                                       8,10,12                           300 x 150              4000 x 2000
                                                       15,19                             300 x 150              4000 x 2000
design and glazing notes

0 External applications – For external glazing, the painted
  surface should always be glazed to the inside surface away                                                                                      49
  from the effects of weathering. Glazing techniques should
  provide for an adequate seal;
0 Backlighting – Though this glass is used as a decorative
  feature internally, backlighting should be avoided. One way
  viewing through the non-paint side is always preferable;
0 Translucent cladding – There has been an increasing trend
  in the use of more transparent and less reflective glass.
  A notable example of this is in the growth in demand of acid        Photo top and second: Painted slumped glass and kitchen splashback –
                                                                      photo courtesy of Glass FX.
  etched or other translucent type glass. Spandrel openings
  are usually non-ventilated and generate a lot of heat within
  the confined space. Chemical vapours may also be released
  from the silicones or adhesives used in glazing the panel.
  These vapours deposit themselves onto the inside of the
  glass surface upon cooling of the glass. These deposits may
  become visible when using a transparent glass.
    For these non-ventilated traditional spandrel applications,
    it is recommended that an opaque (no see through) ceramic
    fired paint colour be specified on heat strengthened glass.
    (With ground floor glazing, where human impact is a
    consideration under AS1288, then toughened or laminated
    glass must be used as a minimum). Any vapour deposits will
    not be seen from the outside. Ceramic-fired painted glass
    has been used in these applications for over 30 years and is
    a proven technology. The paint is highly resistant to this type
    of chemical attack when enclosed. Where translucent type
    glass products (such as acid etched, translucent laminated or
    sand blasted glass) are specified, it should be asked where or
    how these products are to be used in the building. Ceramic
    painted glass should be opaque or with no see through when
    used in these non ventilated applications.
    In some instances, where the space is ventilated or a
    double window façade is constructed, translucent ceramic
    painted glass, translucent laminated or acid etched maybe
    used provided that the coated or etched surfaces are not
    exposed to weathering. The client should also be aware of
    edge delamination if using exposed edged laminated glass.
0 Internal glass cladding (splashbacks) – Minimum thickness           Toughened laminated ceramic silkscreen painted patterned
  is generally 6mm in either clear or low-iron glass. Low-iron        glass in overhead glazing application – Bradnams Commercial.
  glass is recommended for true clarity and consistency of
  colour. Colour mismatches may occur with ordinary clear                                                    Sliding door showing ceramic painted motif.
  glass especially where the glass supplier uses glass from
  different sources. Mismatches may occur if there is a rework
  of a panel and glass is then cut from a different source.
  Though there is less chance of mismatching with regards
  to low-iron glass, we still recommend the policy of ‘one
  source’ low-iron glass (i.e. Starphire® only). Toughened glass
  is always recommended. Special note should be made here
  with regards to protection of combustible surfaces near
  cooking appliances. The use of painted glass panels for
  kitchen splashback applications requires that this glass meets
  the requirements under AS4551/AG101 and AS5601/AG601.
  Suppliers of painted glass products should have accredited
  testing results to verify compliance to these standards.
    These standards are designed to prevent excessive heat and
    possibly fire in combustible materials supporting the wall
    covering. If testing evidence is not available fire resistant
    materials must be installed behind glass panel.
     0 Air face or tin side – Colour differences maybe noticeable        matching/contrasting vision
       if painting the different faces of a glass panel. During the      and spandrel panels
       manufacture of glass, molten tin is used to float the glass.
50     This creates a tin and air side. To avoid colour differences,     Where the appearance requires the entire building façade to be
       it is recommended that the paint medium be applied to the         glass, with either matching or contrasting vision and spandrel
       air face or the non-tin side of the glass.                        panels, the problem of ‘read through’ of the buildings hidden
                                                                         structure/components through the spandrel panels must be
                                                                         addressed.
     spandrel glass
                                                                         0 Matching – If matching vision and spandrel panels,
                                                                           the general rule is that products with a visible light
     Spandrel glass refers to glass used to hide the building              transmittance greater that 20% are difficult to match.
     structure between glass floors. Ceramic base painted glass is a       Greater matching is achieved with high reflecting products
     common product used in these applications. The spandrel glass         with lower visible light transmittance (14% or below);
     can be used to match or contrast with vision glass panels.
                                                                         0 IGU’s – One method to assist in matching is to use IGU’s
     See photo opposite page.
                                                                           or insulated glass units with the reflective coated surface
     In spandrel panels it is always recommended that glass be heat        position #2 and an opaque ceramic painted frit on surface
     strengthened because of the excessive heat build up generated         position #3 or #4. IGU’s create the perception of depth
     (upwards of 70˚C). In this situation the other benefit of heat        similar to that of the vision panel. Other benefits include
     strengthening is apparent, where upon breakage the glass tends        the reduction of condensation and improved longevity over
     to fragment into large pieces and stay intact in the opening or       other methods as detailed below;
     framework.
                                                                         0 Opacifier film – A second method used is to directly
     The other main benefit of ceramic painted products for spandrel       bond a plastic opacifier film to a single glazed panel on
     applications is their greater durability in comparison with other     surface position #2. This cost effective factory applied
     methods of spandrel glazing as described on the following page.       film requires adequate ventilation to avoid damage to the
                                                                           film when excessive heat build up occurs. Opacifier should
                                                                           be cut back in structural silicone glazing situations for
                                                                           maximum bonding strength between glass and silicone.
                                                                           Please consult your film supplier with regards to film
                                                                           warranty. Films are not recommended on glass with visible
                                                                           light transmittance greater than 25% because of potential
                                                                           see-through of air bubbles between film and glass.
                                                                           The use of a shadow box is another cost effective method
                                                                           of preventing read through. Dark coloured insulation or
                                                                           fibrous cement sheeting is placed 25—50mm away from
                                                                           the glass. Preventing condensation and designing an
                                                                           adequate weep hole system are most important;
                                                                         0 Contrasting panels – monolithic or single glazed ceramic
                                                                           painted glass is commonly used here. All spandrel glass
                                                                           panels should be heat strengthened because of the high
                                                                           risk of thermal breakage;
                                                                         0 Mock ups – With spandrel panels it is always
                                                                           recommended that the customer view a mock up sample or
                                                                           inspect a completed building before confirmation is given
                                                                           to glass design/specification.
6mm Panasap Dark Blue vision glass with contrasting blue coloured ceramic painted spandrel glass panels – Bradnams Commercial.




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posted:2/22/2011
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