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Glas

Definition

In the Netherlands, glass is collected separately for recycling. White (clear) glass can only be made from white shards. Green and brown glass is best made from green and brown shards.

Within the University, glass is divided into several main categories, namely

  • domestic glassware (mainly from canteens)
  • laboratory glass (divided into regular glass and borosilicate glass)
  • glassware contaminated with chemicals
  • flat glass (panes).

See the following list to check what can and cannot be put into the glass bank outside the building.

Table 7.1: Overview of what can and cannot be put in the glass bank

Not in the glass bank

Why not in the glass bank?

Earthenware (plates, mugs, etc.) and stone jars

Crystal glass

Light bulbs and fluorescent tubes –

separate disposal as hazardous waste

Window glass (panes)

i.e. flat glass

Mirror glass

Ovenproof glass (oven dishes and tea glasses)/laboratory glass/

borosilicate glass

Earthenware and stone jars are not made of glass.

Crystal glass contains lead oxide, which is not permitted in glass packaging.

Light bulbs are classified as residual waste because they contain other materials apart from glass.

Energy-saving light bulbs and fluorescent tubes are classified as hazardous waste; the starter is not made of glass and contains hazardous substances.

The composition of window glass is not the same as that of glass packaging. *(construction and demolition)

Mirror glass is window glass coated with a metallic layer.

Ovenproof glass has a higher melting temperature than glass packaging and does not melt during the processing of glass shards.

Window glass and mirror glass must be put in a separate disposal container

Waste that cannot be put in the glass bank must be disposed of with residual waste or in the building and demolition waste container outside the building.


Disposal

Glass banks are provided in relevant locations. They are intended for domestic glassware and glass containers for chemicals. The latter must be rinsed and the labels removed or rendered illegible.

Glass banks are emptied on request, and this can be arranged via FacilityNet.

Outside the building there are glass banks for clean domestic glassware that is clear or coloured (green or brown).

glas container logo
glas container logo

Processing

First, non-glass substances are removed: metal tops are sent for recycling. Labels are removed by soaking, and the resulting paper pulp is transported to a factory where it is made into bricks. The small amount of dirt remaining is burnt away when the glass is melted. All that remains of the glass itself is a small amount of ‘dirty’ grit that is used in road building. All in all, very little waste remains that needs to go to landfill or be incinerated. Glass is 100% recyclable, and there is no limit to the amount of times it can be recycled. The recycling of glass bottles and jars saves a great deal of energy and raw materials.

Extra information

Glass packaging that contained chemicals can be disposed of in the glass bank by the building. The glass must be rinsed and any labels removed or rendered illegible.
Last modified:16 December 2015 08.51 a.m.
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