What is Acoustic Glass?

Şişecam Acoustic Laminated Glass is sound insulation glass of Şişecam Flat Glass. Acoustic laminated glass contains a special acoustic interlayer which acts as a dampening core between the glass panes, preventing sound frequencies vibrating from one pane of glass to the other, developed for excellent sound insulation for places where there is excessive high level noise. Şişecam Acoustic Laminated Glass not only provides improved acoustic performance, it also provides the safety properties of Şişecam Laminated Glass.

Places where safety and noise control can be provided together:

• Ideal choice of glass in situations where there is excess noise from road, rail or air traffic, or various other sources for example factories or nightclubs
• Interpreting booths
• Office separations
• Meeting rooms
• Concert areas

Şişecam Acoustic Laminated Glass® is produced in accordance with EN ISO12543 Glass in building- Laminated glass and laminated safety glass and EN 1279 Glass in building - Insulating glass units.

Şişecam Acoustic Laminated Glass contains a special acoustic interlayer which acts as a dampening core between the glass panes, preventing sound frequencies vibrating from one pane of glass to the other, developed for excellent sound insulation for places where there is excessive high level noise.

For efficient sound insulation, similar measures should be taken also in the other structural elements and materials such as walls, roof and joineries.

There is nearly 3dB difference between Şişecam Laminated Glass and Şişecam Acoustic Laminated Glass, and 5 dB between Şişecam Clear Float Glass and Şişecam Acoustic Laminated Glass. In sound insulation, 10dB means a decrease of 50% in noise.

Correction Factors

The measuring unit for the sound insulation behavior of a building component is Rw. This value is merely an average simplifying mutual comparison of various building components. The ears sensitivity to sound volumes in relation to their frequency pitch can only be taken into account with the airborne sound insulation index Rw.

Here the spectrum adjustment factors C and Ct adjust the average. For sound waves featuring high frequencies, the factor C needs to be added to the Rw value. For lower frequencies, factor Ctr needs to be added. The acoustic behaviour of a building component is hence defined in Rw (C, Ctr). A building component with the values Rw (C, Ctr) = 40 (-1, -5) provides an average insulation performance of 40dB. For higher pitched sounds the sound insulation is lessened by 1dB and for lower pitched sound sources it is lessened by 5 dB.

Tolereance on size,=< 8 mm +5, -3; 8-10 mm +6, -4; 10 mm > +8, -6

Cutting

Laminated glass has to be cut in laminated glass cutting table. Both sides of the laminated glass are cut at the same time. Then the glass is broken/snapped off from the top and the bottom automatically. Cutting laminated glass on float glass cutting table is inconvenient and takes longer time. Furthermore, turning difficulty can cause the glass to break from the uncut side. Our customers using this type of cutting tables should first cut X, then Y according to the sizes being required. Especially for laminated glasses with 3+3 and 4+4 mm thicknesses, which are cut at the same time at X and Y and separated, undesirable breakages can occur while turning the uncut side with a crane.

Scoring length (3210-6000), feeding type, transporting type, heating equipment (IR mid wave), cutting head precision, minimum cutting length, breaking equipment and tilting availability are key factors when choosing a laminated glass cutting table.

Referring to cutting laminated glass, even though there are various applications of machine manufacturers, volatile or washable cutting oil is recommended. Kerosene should not be used for cutting. The dust and particles on the feeding table should be cleaned with air before the cutting process. Therefore the need to clean photocells, LEDs and switches on the cutting

Breaking of the upper glass is carried out by the breaking bar under the machine and the upper jamming bars. These bars should be smooth and not worn. During this breakage upper suction cups (if present) should hold the glass.

Pressure differences between breaking bars may cause undesirable breakage.

The air pressure coming to the cutting table should not change.

Straps that move the cutting heads are usually wired inside. These wires can break in time and the plastic layer loses its property. The straps should be checked continuously.

Periodic controls of the pneumatic elements of the cutting heads should be done and issues like oil leaks and pad problems should be solved by periodic maintenance. The neglecting of the pneumatic components may be the reason for undesirable breakage.

Up and down heads should cut the glass simultaneously, and the cuts should be aligned. If there is any difference between the cuts, the glass will break chipped. In this case, the manufacturer should revise the calibrations of the cutting table.

Glass particles and dust occurred during the cutting process, accumulate on the heating resistance used to separate PVB from glass and cause the resistance to turn into opaque color. Because of the accumulation of dirt and PVB drops in time, the time needed for the separation of PVB from glass extends and chipped breakages may occur. As a result of overheating, PVB may slip inward and undesirable breakage may occur. Another disadvantage is the need to cool the glass, which has one overheated side. Otherwise if the overheated side is cut immediately, the glass may break. The resistance should be always kept clean and should be cleaned with special cleaning liquids or alcohol.

Hoses carrying air to cutting heads should be in good condition and without a hole. Otherwise undesirable breakage may occur because of jumping cuts. Hoses should not touch anything during cutting.

The switch tracking the glass at the cutting head should be green at all times. If it blinks this means a jumping cut. The switch position should be adjusted or changed.

Maximum care should be taken for the storage conditions of laminated glass. Maximum care should be taken for the laminated glass not to be affected by humidity and heat.

If laminated glass is installed on site as single glazing without being washed and being dried completely, corrosion may occur. Therefore it should be washed prior to installation on site.