Christchurch Glass

INSPECTION PROCEDURES"

Clean the glass with a proprietary glass cleaner.
Stand 2 meters from, and square to the pane of glass
View the glass in normal daylight conditions, out of direct sunlight.
if a fault is evident, first try ti remove it by carefully cleaning the glass surface, on both sides.
Re-examine the fault and if necessary contact your glass supplier for inspection
Never attempt to remove a fault with a razor blade or other sharp metal objects, at this will always scratch the glass.

THIS INFORMATION IS OFFERED AS A GENERAL GUIDE ONLY AND IS NOT A SUBTITUTE FOR DETAILED TECHNICAL ADVICE

Christchurch Glass disclaims all liability for loss or damage suffered from the use of this data

GLASS QUALITY STANDARDS

The most common quality enquiries are related to one of the following factors: - surface scratches of scuffs. These can occur during manufacture, cutting, processing, handling, glazing, cleaning, or by accident on site, and are the most common group pf complaints regarding glass in a new home. These can take the form of very light scratches which are only visible under certain lighting conditions, to very deep scores which can effect the strength of the glass surface staining or corrosion.

Generally occur if the glass is subject to on sit attack from alkaline chemicals, particularly when solutions are washed from cement, mortar or concrete surfaces, or from salt spray if the locations is near to the sea, or from chemical run-off from weathering steel, iron, lead or minimum. Light stains may be able to be improved by using a mildly abrasive product such as a brassware cleaner, but badly affected glass requires replacement, together with positive identification of the cause and remedial action to prevent reoccurrence.

Interference phenomena, such as Newton's rings or Brewster fringes occasionally occur in insulated glass unit and are observed as a rainbow effect. They are not a deterioration of the glass, but are caused by light refraction between the four glass surfaces of the insulated glass units and can only be avoided by ordering units with unequal thicknesses of glass, due to the reflection of light within the interlayer.

Delamination of laminated glass can occur if the glass edge is immersed in water for prolonged period, usually due to defective glazing seals, It shows as a localised milky area on the glass edge, sometimes extending in for 50mm or more. It can only be rectified by replacing the glass and sealing the glass edge from water penetration.

Distortion sometimes occurs in toughened safety glass due to the heating process, and is named "roller wave". It appears in the form of distortive bands at regular intervals, 250mm to 300mm apart. It is more apparent in reflective glass and cannot be rectified other than by reglazing. Old glass, made by the sheet or cylinder glass process also has inherent distortion characteristics which again are not correctable.