UNI EN 12150-1 silicate glass safety glass
This legislation can define tolerances, flatness, edge processing, and characteristics which must be paid in case of fragmentation.
This legislation has the other riferimentile following standards:
EN 572-1 Glass in building – Basic soda lime silicate glass products:
Definitions and general physical and mechanical properties
EN 572-2 Glass in building – Basic soda lime silicate glass products: Float
glass
EN 572-4 Glass in building – Basic soda lime silicate glass products: Drawn
Sheet Glass
EN 572-5 Glass in building – Basic soda lime silicate glass products:
Patterned glass
EN 673 Glass in building – Determination of thermal transmittance
(U value) – Calculation Method
EN 1096-1 Glass in building – Coated glass – Definitions and classification
PREN 12600 Glass in building – Pendulum test – Impact test method for flat glass
and performance requirements.
The safety glass made from soda lime silicate hardened is realized through a pane of glass monolithic and must match in case of broke to fragments with no sharp edges and rounded.
In the process of hardening heat can come to create deformations of the plate surface, these signs are defined signs of stapling, these deformations must still fall within the tolerances specified for the realization of silicate glass, soda lime.
Please note that this production process can never generate a totally flat, so there may be to create two kind of curvature:
spiking global
localized buckling
The glass for the measurement dell’incurvamento is placed perpendicularly to the ground and kept in vertical position by holding the longer sides, the deformations must be verified the edges of the glass and along its diagonal, said measurement must be carried out at room temperature.
For any work on the glass of soda lime silicate remember that after the work hardening should not be cut, sawn, or subjected to processing the edge so any activities to be undertaken on the plate should be strictly carried out the first of the quenching; also for the realization of the holes must be taken into considerations slabs with a thickness exceeding of 4 mm, the diameter of the hole it is recalled that misses possibly be less than the thickness of the slab
Their position will be affected by:
nominal thickness
sizes of the plate
diameter of the holes
form of the glass sheet
quantity of holes to be played back on the plate
We speak now of the fragmentation tests of the plates the size of the samples to be tested must be: (please refer to the norm) and each specimen shall be struck with a steel tool with tip in a point located a13 mm from the edge and the middle of the longest side of the same specimen.
How to espi of sharp tools and how it should be placed the plate (sample) can be found in paragraph 8.3 of the standard.
At the end of the test will be listed in the fragments and tested their measurement, the measurement will be carried out by applying a mask of detection of 50 + / -1 mmal order to see exactly how many frmmenti have generated.
Also characteristics of glass that will be put in question will be:
Optical distortion
Anisotropy
Thermal durability
Mechanical strength
The marking shall indicate that the glass is soda lime silicate must be strictly follows:
name and mark of the manufacturer
number of European reference standard (in this case EN 12150)
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