La Rochere Glass Block Range
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The range of glass blocks featured are manufactured by La Rochere of France,
who are renowned for their high quality glass production since 1475AD.
By extracting impurities of raw materials, La Rochere blocks have an
extremely clear tint to the glass. A by-product is that the furnesses are heated
to higher temperatures to fuse the blocks and this results in a basic fire rating
of 1 hour fire integrity and a thermal isolation of 15 minutes when installed in
accordance with Rods & Mortar and sealed in Firestop silicon.
Glass Block Transparency Rating
Here is a simple guide to assist in selecting glass blocks when the level of transparency required is an issue.
The duck is placed behind the glass block.
 |
 |
 |
 |
 |
| Clear Flemish |
Clear Frosted |
Clear Java |
Clear Bubble |
Transparent |
Sandblasted Glass Blocks
All blocks can be sand blasted one side or two.
Sandblasting can also be referred to as shotblasting, satinating or Sahara finish.
Sandblasting is a safer means of satinating Glass Blocks compared with acid etching.
Sandblasted blocks can be treated with a protective coating to offer resistance against smudges and water marks.
Example:
 |
 |
| Clear Flemish not sandblasted |
Clear Flemish sandblasted one side |
Physical Properties of Glass Blocks
The following information is based on a typical 190x190x80mm clear glass block.
Glass
Composition : Silica-sand, soda ash, calcium.
Fusion is obtained at approximately 1550OC.
Light Transmission
Clear 190x190x80 = 80%
Coloured 190x190x80 = 60%
Thermal Transmission
Average value = 2.9 W/m² °C : Single Wall.
Impact Strength
12.0 N/mm - Tested using 50kg sand bag and steel ball bearings.
Sound Transmissions
Rw = 42dB depending on frequency.
