tempering, flat glass, UPR, ecoinvent 3.6, Undefined

ISIC4 categories:
C:Manufacturing/23:Manufacture of other non-metallic mineral products/231:Manufacture of glass and glass products/2310:Manufacture of glass and glass products
RER - Europe
Reference year: 2000 - 2000

Location: RER - Europe
Basic assumption of unit process raw data for the tempering of glass. Tempering or toughening is a special process of solidification of a glass sheet in order to make it particularly resistant to breakages. The process may be physical (thermal) or chemical. Here a thermal tempering is assumed. The result is a sheet of glass which is two or three times stronger than untempered glass.
[The full documentation of this dataset was originally provided in the corresponding ecoinvent report from the Swiss Centre for Life Cycle Inventories, which is accessible for free to guests and users of ecoinvent version 2 (https://www.ecoinvent.org/login-databases.html). The dataset may subsequently have been subjected to central changes to the database, as described in the respective change report for each new release.]
Undefined unit processes (UPRs) are the unlinked, multi-product activity datasets that form the basis for all of the system models available in the ecoinvent database. This is the way the datasets are obtained and entered into the database by the data providers. These activity datasets are useful for investigating the environmental impacts of a specific activity (gate-to-gate), without regard to its upstream or downstream impacts.


The glass sheet is heated to a temperature just below its softening point (about 640°C) and then immediately cooled by special jets of cold-air. These harden the surface of the glass, giving the inside more time to cool. This allows the external layer to crystallize into a wider lattice while the inside solidifies with greater compression than in the crystal lattice.

Process type
Supported nomenclature
ecoinvent 3.6
LCI modeling approach
Before modeling
Multifunctional modeling
Aggregation type
Data provider
Review status
For sale

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