On 25/08/2013 11:50, Huge wrote:
On 2013-08-25, Nightjar wrote:
On 24/08/2013 20:47, alan wrote:
On 24/08/2013 16:53, Steve Firth wrote:
Huge wrote:

It all goes for cullet, mostly to make glassfibre insulation.

Not quite true. The A1M from Wakefield to the A19 was rebuilt using
lots of
"recycled" glass. It makes excellent ballast. Significant quantities of
cullet are used as construction materials where it can replace sharp
sand.


None of which requires the glass to be separated by colour.

Colour is important when making new glass. The raw materials for glass
melt better if a quantity of recycled glass is mixed with them.

I have read (several times) that because the general public cannot be trusted
to properly separate glass by colour, that recycled glass is not used for
any purpose where its colour matters, and that it all goes for glass-fibre
insulation and road surfaces.

I am going by the statment made by an expert from Pilkington Glass,
describing the manufacture of float glass for the programme Unbuilt
Britain a couple of weeks ago, that recycled glass was essential to get
the raw materials to melt properly. Of course, as a glass manufacturer,
they may well be able to source all the recycled glass they need from
manufacturing waste.

Colin Bignell