Copyright 2009 -
01753 -
Q. What are the basic types of Glass
- Annealed – Standard glass as made by the Float or Rolled plant.
- Horticultural – Annealed glass for use in greenhouses and sheds where optical quality is not important and compliance to BS6206 is not required.
- Toughened – Annealed glass, arrissed as standard, heat treated and breaks safely into small pieces. Cannot be cut or drilled after toughening.
- Heat Soaked – A further process after toughening to try and eliminate spontaeneous breakage in toughened glass from Nickel Sulphide inclusions. Normally used on thicker glass glazed at high level.
- Laminated – Two pieces of glass with a PVB or resin interlayer, breaks safely and normally is retained within the aperture.
Q. Is there such a thing as, “Oneway Mirror”?
A. Yes, 7.4MM Laminated One Way. The glass has a grey body tint with a reflective surface coating. The glass is installed with the surface coating facing the observed area. The glass has low light transmittance and high reflectance, when the glass is installed with a lighting ratio of 7:1, the dark side being the side where the observer is, who should also wear dark clothing, the reflection will be look like a mirror to the observed.
Q. What is the mirror with stripes on?
A. “Venetian Stripe Silvered”, deceives the eye by reflecting light from the bands of silvered glass but obviously not a secret viewing mirror.
Q. What is, “Cracked Ice”?
A. A resin multi laminate where one of the glasses used is a toughened one which after laminating, is broken and gives a “crazed” appearance. At the time of enquiring we need to know if the piece is, four edge glazed, clear or tinted and any processing that may be necessary.