11
AGC Stopray SMART
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Processing Guide
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Version 4.1
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May 2020
6.2
Stopray SMART Laminated with silkscreen
The application of a silkscreen on a laminated safety glass is allowed, meaning:
6.2.1
The coating Stopray SMART is in contact with the pvb-interlayer;
6.2.2
The silkscreen is applied on pos. 2, facing the cavity.
Two cases are possible :
1)
the silkscreen is in contact with the sealant joint: the compatibility of the sealant joint, structural joints
and weather seals with the silkscreen is the responsibility of the manufacturer of the insulating glazing
units, and should be assessed in cooperation with the sealant supplier.
2)
no silkscreen in contact with the sealant joint: no assessment required.
AGC recommends to assess the aesthetics by means of a mock-up sample.
The calculation and dimensioning of the sealant joint is the responsibility of the manufacturer of the
insulating glazing units.
*Note: Application of silkscreen is not allowed for Stopray SMART 32T.
7
Thermal Toughening / Heat strengthening
7.1
Introduction
The Stopray SMART 30 and 51 are self-matchable (IGU only): these products can be used annealed
or toughened / heat strengthened as needed by the application. Both annealed and heat treated
products have similar reflection and transmission.
The Stopray SMART 32T is NOT self-matchable (IGU only): toughened / heat strengthened as needed
by the application.
Pre-process defects will generally only be revealed by the toughening process itself and this can
cause severe aesthetic defects.
Therefore we strongly recommend that all objects coming into
contact with the coating of the glass during preliminary processes to be pre-validated
.
7.2
Generalities
When a clear glass is placed in a toughening furnace it deforms considerably (concave shape)
during the first heating cycle. The deformation is even more pronounced with low-emissivity
glasses such as Stopray SMART.
This is due to the different heating speeds of the surfaces.
In a purely radiation furnace, the lower surface is heated by conduction (contact with the rollers)
and radiation (lower heating resistance). Since the upper surface is covered with a low-emissivity
coating, which, by definition reflects the radiation emitted by the upper heating elements in the
furnace, it does not heat up as quickly. The two surfaces do not, therefore, heat up symmetrically
which leads to concave deformation of the glass due to differential expansion (see photo below).
This phenomenon causes a marking, or even optical deformation of the glass at the center of the
pane.
