Performance Measuring Standards
SCRATCHES AND BLEMISHES; –
Hand Cleaning Low E Glass
Low-E glass has a very thin, hard, pyrolytic coating on one surface. This durable low emissivity coating gives improved thermal insulation performance, and in the case of Laminate combinations, improved solar control, compared to ordinary clear glass. The low emissivity coated side does have a very fine, hard texture which requires a slightly different cleaning procedure compared to that needed for plain, non-coated, glass. Cleaning details for the coated surface are given below.
Note the following recommendations, for washing Low E Glass by hand cleaning and spot cleaning.
- Under no circumstances should abrasive cleaners, hydrofluoric acid, fluorine compounds or strong alkalis be used on the coated surface.
- When hand cleaning, we recommend the use of standard glass cleaners with a low PH (except those containing solids in suspension), together with a lint-free towel.
- Abrasive cleaners should not be used as they can cause bright or dark spots which may only be seen under certain lighting conditions.
- Using a standard glass cleaner will remove marks made by plastics and acrylics.
- For organic deposits which may have been abraded onto the coated surface, use the appropriate solvent.
- Do not use a razor blade, wire wool or any other metal item to remove stubborn marks. These will leave metal particles on the coating that appear as scratches.
- If, in any event the Low E surface gets damaged via stain or metal scratches (which leaves Grey / Black streaks across the glass) a 50/50 mixture of Acetone and Vinegar can be used with a lint free cloth to rub the marks off the glass.
Inspections will view the installed product at a distance of not less than three (3) metres, at 90 degrees to the inspected glass glazed installation and under normal lighting conditions, i.e. reasonable lighting conditions under which the products are normally viewed. Glass is normally viewed from the outside of the building.