GB/T 47616-2026Greenhouse gases - Quantification method and requirements for the carbon footprint of products - Stone (English PDF)

6.2 System Boundary

6.2.1 The system boundary for quantifying the carbon footprint of stone products includes the raw material production stage, the raw material transportation stage, and the product production stage, see [link to relevant documentation]. Figure 1.

6.2.2 The raw material and auxiliary material production stage begins with the extraction of primary natural resources and ends when the raw materials and auxiliary materials arrive at the stone production plant, including natural... Raw material production for stone (such as stone block quarrying, slab production, adhesives, protective agents, etc.), and raw material production for composite stone (such as natural stone, ceramic tiles, etc.). Raw material production for artificial stone (such as unsaturated polyester resin, cement, calcite, dolomite, stone, etc.), including glass, aluminum honeycomb, aluminum composite panels, and insulation materials. Production processes of raw materials (such as sand, adhesives, protective agents), and auxiliary materials (such as the production process of packaging materials).

Note. Raw materials are materials that enter the product and are related to the product's function and performance; auxiliary materials are materials other than the main raw materials.

6.2.3 The raw material transportation stage begins when the raw materials and auxiliary materials are transported from the place of origin to the stone production plant and ends when they arrive.

6.2.4 The product manufacturing stage begins when raw materials and auxiliary materials arrive at the stone factory and ends when the product leaves the factory, including material preparation, cutting, edge grinding, and polishing. In-plant transportation.

6.3 Declaration of Unit The entity responsible for declaring the carbon footprint of stone products should include the following information.

---Measurement of unit quantity of product, 1m2;

---Key performance characteristics or specifications (such as dimensions, thickness, weight per unit area, main materials, etc.). Example. A 1m^2 granite sheet with dimensions of 600mm x 600mm and a thickness of 20mm.

6.4 Selection Criteria The material (energy) data involved should meet the following selection criteria.

a) All energy inputs must be listed;

b) All raw and auxiliary materials must be listed; if they meet requirements

c) and d), they can be ignored.

c) Neglected individual material (energy) flows or unit processes contribute no more than 1% to the product's carbon footprint;

d) The total contribution of all neglected material (energy) flows and unit processes to the product's carbon footprint does not exceed 5%, and this contribution is not reflected in the product's carbon footprint report. This will be explained in the report;

7.1 Data Quality Requirements

7.1.1 The data and data quality shall meet the relevant requirements of 6.3.6,

6.3.8 in GB/T 24067-2024.

7.1.2 The activity data must meet the following requirements.

a) Completeness. The system should be checked for any missing unit processes or input/output substances in accordance with the data scavenging criteria (see 6.4). Activity data should be collected from the company's production statistics for one calendar year or 12 consecutive months.

b) Accuracy. Energy and raw material consumption data in the activity data should be derived from the company's actual production statistics records. All activity data should be accurate. It should be converted to be based on the declared unit, and relevant activity data, data sources, calculation processes, etc. should be recorded in detail.

7.1.3 The carbon footprint factor meets the following requirements.

a) Representativeness. Field data or emission factor data provided by suppliers should be used first; secondly, the latest data published by the state should be used. And relevant database data that has been evaluated; finally, publicly published literature data and industry statistical recommendations are used.

b) Completeness. This should cover all unit processes defined at the system boundaries.

7.2 Data Collection and Verification

7.2.1 The following data should be collected during the raw material and auxiliary material production stage.

---The consumption of raw materials and auxiliary materials is uniformly converted into mass (t);

--- Carbon footprint factor of raw material and auxiliary material production process.

7.2.2 The following activity data should be collected during the raw material transportation phase.

---The transport weight and consumption of raw materials and auxiliary materials are uniformly converted into mass (t);

---Transportation distance and mode of transport for raw materials and auxiliary materials. If there are multiple suppliers of raw materials and auxiliary materials, a weighted average transportation distance can be used. The weight refers to the transport weight of raw materials and auxiliary materials;

---Carbon footprint factors for different modes of transportation.

7.2.3 The following activity data should be collected during the product manufacturing stage.

---For fuel transportation volume, distance, and mode of transport, if multiple suppliers exist, a weighted average transportation distance can be used, with the weight being the transportation distance. weight;

---Consumption of energy sources such as electricity, fuel, and heat;

---The lower heating value of the fuel;

---The carbon footprint of energy production, including electricity, fuel, and heat;

---Carbon footprint factor of fuel transportation;

---The carbon footprint factor of fuel combustion;

7.4 Allocation

7.4.1 During system boundary settings or data collection, if it is found that at least one unit process's inputs and outputs contain multiple products, then it is necessary to... Allocation needs to be carried out.

7.4.2 The allocation method is as follows:

a) Avoid data allocation by collecting data from detailed unit processes, such as using metering or statistical data by process or time period to replace data allocation across the entire plant. Annual statistics;

b) If data allocation cannot be avoided, prioritize allocation based on physical relationships, such as product quality;

c) If physical allocation is not feasible, the economic value of the product shall be used for allocation;

d) For symbiotic products that are used repeatedly in a closed loop, no allocation is required.

8.2 Calculation Method

8.2.1 Method for Calculating the Carbon Footprint of Stone Products After data collection and verification are completed, the activity data will be converted into a unified declaration unit and calculated according to formula (1).

8.2.2 Raw and auxiliary material production stage Greenhouse gas emissions during the raw material production stage are calculated using formula (3), and the results are rounded to two decimal places.

8.2.3 Raw Material Transportation Stage Greenhouse gas emissions during the raw material transportation stage are calculated using formula (4), and the results are rounded to two decimal places.

8.2.4 Product Manufacturing Stage Greenhouse gas emissions during the stone product production stage include the acquisition, transportation, and combustion of energy consumed in production. Each declared unit of greenhouse gas emissions per unit produced... Greenhouse gas emissions during the production stage are calculated using formula (5), and the results are rounded to two decimal places.

8.3 Additional Environmental Information In addition to the product carbon footprint quantification results described in section 8.2, other relevant important information should be described in the supplementary environmental information section, such as product... The yield rate, the amount of non-fossil energy and green electricity purchased and used through market transactions, etc.