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General comment Allocation rules used are made according to the ISO14044:2006. Allocation is avoided when possible
and when necessary, allocation is made based on physical shares and also avoiding double
calculations. Allocation is required if the production process produces more than one product and the
flows of materials, energy and waste cannot be separately measured for the studied product.
Allocation used in generic data sources follow the requirements of the EN 15804 -standard. It should
be noticed that the allocation method ‘allocation, cut-off by classification’ has been used for Ecoinvent
3.10.1 data, which complies with EN 15804. Avoiding allocation could not be avoided for following
inputs as the information was only measured on factory process level.
• Electricity: only measured on factory level.
• Packaging materials: only measured on factory level.
The inputs were allocated to studied product based on production volume (mass in kilograms).
According to EN 15804, flows leaving the system at the end-of-waste boundary of the product stage
(A1-A3) are allocated as co-products. According to EN 15804, process that has a very low
contribution to the overall revenue may be neglected in co-product allocation.
Steel and aluminium scrap collected from the cutting process is sent for recycling. This process has
a low contribution to the overall revenue and may be neglected in co-product allocation. Contributions
to the overall revenue of the order of 1 % are considered very low, therefore the co-product allocation
is not required and not carried out. Other materials did not carry any benefits towards Halton’s
production. Hence, no other co-product allocations were made.
This study follows the cut-off criteria stated in RTS PCR and EN 15804 -standard. This study does
not exclude any modules or processes which represent more than 1 % of the emissions of studied
life cycle stage. The study does not exclude any hazardous materials or substances.
Excluded processes and the criteria for exclusion are given in the following table. Machines and
facilities (capital goods) required for and during production are excluded, as is transportation of
employees.
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