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ROBER TEMPER HST (HEAT TEMPERED GLASS) 

Characteristics: HIGH RESISTANCE TO FLEXURE

Description

Rober Temper glass has undergone a thermal treatment to increase resistance to mechanical and thermal stress. This procedure consists in a rapid heating of the pane to a temperature of 640°C ca. followed by rapid cooling. The rapid cooling process causes the hardening of the superficial layers, leaving the interior warm for a longer period. The subsequent cooling of the central part produces a compression stress on the glass surface, balanced by the easing of tension on the interior, conveying a resistant quality of tempered glass. Not all types of glass can be tempered. For example, if they have intricate forms or numerous holes, they may break during the tempering procedure, due to internal stress on the material. Tempered glass is about 6 times more resistant than float glass, with a resistance to flexure of at least 120 MPa circa.

It is also considered safety glass since it has the tendency to break up into tiny pieces

Another procedure called the Heat Soak Test can be done to reduce the presence of eventual spontaneous breakage. This test consists of a heating cycle that maintains the temperature of the panes at about 300°C; it is often done to accelerate the breakage of tempered panes that would tend to break spontaneously. The test allows the elimination of 99% of the panes that would break in the process. 

Applications  

Tempered glass can be used for the realization of elements without a supporting structure, such as doors without metallic frames, or in structural applications.

Rober Temper HST can be used both in construction and interior decorating: doors and windows, canopies, continuous façades, stairways, railings, and numerous other structures.

Dimensions

Thickness from 4 to12 mm

Maximum dimension 3000x1800 mm 

Technical parameters on Pilkington OPTIFLOAT base

Technical parameters OPTIWHITE – Pilkington Technical parameters K GLASS

Key TL – Light transmission (%) Light flow transmitted directly through the glass, expressed as a percentage ratio between light radiation that penetrates the glass and the total amount affecting the same glass. RE – External light reflection (%) Light flow reflected by glass, expressed as the percentage ratio between light radiation reflected by glass towards the outside and the total amount affecting the same glass. RI – Internal light reflection (%) TE – Energy transmission (%) Energy flow transmitted directly through the glass, expressed as a percentage ratio between solar radiation directly transmitted by glass and solar radiation affecting the same glass. AE – Energy absorption (%) Energy flow absorbed by glass, expressed as a percentage ratio between solar radiation absorbed by glass and solar radiation affecting the same glass. g – Solar factor (%) Percentage ratio between solar radiation globally transmitted by glass and solar radiation affecting the same glass. U – Thermal transmittance (W/m²K) Quantity of heat transmitted per second (stationary regimen) by a square meter of glass surface for every degree of temperature difference between external and internal environment.  Rw – Rw pondered acoustic attentuation index Value that defines the noise abatement of a glass panel. A laboratory calculation on the basis of experimental measurements of attenuation at various intervals of frequency for comparison on a prefixed reference curve. Ra – Index of color accuracy (%) Measurement of the degree in which the perception of objects illuminated by natural light and observed through glass conforms to that observed under the same conditions but without the glass barrier, on a scale from 1 to 100. For applications of flat glass in construction, values over 90 are excellent, between 80 and 90 are good. The illuminating reference is CIE D65. C – Noise (dB) CTR – City noise (dB)

N.B. Rober Glass can emit the CE trademark on Pilkington glass, where initial type tests have been conducted: therefore, it is possible, when dealing with large orders, to begin the marking process for the product requested by the client. Should the glass be delivered to Rober Glass for workmanship purposes, the client must provide documentation regarding the origin of the material.