Process information
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| Location | RER | ||
| Reference year | 2024 | ||
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| Use advice for data set | Scope: This EPD relates to wood construction screws, particleboard screws, drilling and sheet metal screws, screws for plastics, metric screws and pin-shaped fastening elements with threaded steel or stainless steel. Depending on the screw type, these products are usually used to fasten two or more components made of wood, steel or plastic. The declared environmental data per 1 kg of stainless steel are based on a weighted average of stainless steel screws in a Würth manufacturing plant, the SWG Schraubenwerk Gaisbach GmbH, and are internationalized with generic data. The declarant is liable for the underlying information and evidence; liability of the IBU (Institut Bauen und Umwelt e. V.) for manufacturer information, life cycle assessment data and evidence is excluded. The EPD (Environmental Product Declaration) was prepared in accordance with EN 15804 + A2: 2022-03. Hereafter the standard is referred to in simplified form as EN 15804. System boundary: Type of EPD: Cradle-to-Gate - with options, Modules C1-C4 and Module D (A1-A3 + C + D and additional modules: A4, A5). Manufacturing phase (A1-A3): The manufacturing phase includes: · A1 Delivery and processing of raw materials (primarily stainless steel), · A2 Transport of raw materials to the manufacturer, · A3 Production of stainless steel screws (including energy provision, treatment of production waste, production of packaging material). Construction phase (A4-A5): The construction phase includes: · A4 Transport to the construction site 100 km by truck, · A5 Disposal of packaging and installation of the stainless steel screw. End-of-life phase (C1-C4): The end-of-life phase includes: · C1 mechanical dismantling (hand-held screwdriver; battery-powered) · C2 Transport to waste processing; 50 km by truck; the transport distance can, if necessary, be adjusted to the building level (e.g., for 100 km actual transport distance: multiply life cycle assessment values by a factor of 2) · C3 Waste treatment for recycling of stainless steel. · C4 No components of the product are landfilled. Benefits and burdens beyond the system boundary (D): Module D includes: - Material recovery potentials from metal recycling and energy recovery potentials from the thermal utilization of packaging. | ||
| Technical purpose of product or process | Timber construction screws, chipboard screws, drill and sheet-metal screws, screws for plastics, and pin-shaped fasteners with stainless steel threads are used for fastening two or more components. Depending on the screw type, these products are generally used to fasten components made of wood, steel, or plastic. Possible application examples include timber construction, steel construction, use in indoor or outdoor areas, for furniture applications, or window construction. Examples of Würth product groups are ASSY, Pias and Piasta screws. | ||
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| General comment on data set | With pin-shaped fasteners with threads, e.g., screws made of stainless steel, these are fasteners that are predominantly used to join two or more components. The materials to be joined or the screw-in substrates can be wood, wood-based materials, plastics, aluminum, steel, stainless steel, or other metals. Pin-shaped fasteners such as screws are typically made from wire (stainless steel) and on the side of the component to be tightened they are provided with a head. This can be formed differently depending on the application, e.g., countersunk head, lens head, hex head, or washer head, and other forms. For anchoring the pin-shaped fastener, on the opposite side the thread is formed. The thread formation (e.g., wood thread or metric thread) is matched to the screw-in substrate and can vary in terms of thread height, flank angle, or thread pitch. The tip formation of the pin-shaped fastener is matched to the application, e.g., wood tip, drill tip, or blunt tip. To protect against corrosion, the pin-shaped fasteners can be provided with different coatings, e.g., zinc or anti-seize agents. Depending on the application, the additional use of suitable steel or stainless steel seals as well as EPDM seals (Ethylene-Propylene-Diene Monomer Rubber), washers, or nuts is provided. Depending on the application, the pin-shaped fasteners may be subject to national or European requirements such as the Construction Products Regulation. For example, the following verification options may be available: | ||
| Copyright | Yes | ||
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| Data set valid until | 2029 | ||
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| Technology description including background system | Stiftförmige Verbindungsmittel wie beispielsweise Schrauben werden in der Regel aus einem Draht (Edelstahl) gefertigt und an der anzuziehenden Bauteilseite mit einem Kopf versehen. Dieser kann je nach Anwendung unterschiedlich ausgeformt sein z.B. Senkkopf, Linsenkopf, Sechskantkopf oder Scheibenkopf und weitere Ausformungen. Zur Verankerung des stiftförmigen Verbindungsmittels erfolgt auf der gegenüberliegenden Seite die Ausformung eines Gewindes. Die Gewindeausformung (z.B. Holzgewinde oder metrisches Gewinde) ist auf den Einschraubuntergrund abgestimmt und kann unterschiedlich hinsichtlich Gewindehöhe, Flankenwinkel oder Gewindesteigung ausgeformt sein. Die Spitzenausformung des stiftförmigen Verbindungsmittels ist auf die Anwendung abgestimmt z.B. Holzspitze, Bohrspitze oder stumpfe Ausformung. Zum Schutz vor Korrosion können die stiftförmigen Verbindungsmittel mit unterschiedlichen Überzügen z.B. Zink oder Gleitschutzmittel versehen sein. Derzeit werden hauptsächlich die folgenden Produktionsverfahren zur Herstellung von stiftförmigen Verbindungselementen mit Gewinde eingesetzt: Kalt- oder Warmfließpressverfahren mit mehrstufigen Presswerkzeugen. Das Ausgangsmaterial wird als aufgespulter Draht auf Spulen angeliefert und in der vorgelagerten Anlage abgewickelt und gerichtet. Moderne Kalt- und Warmfließpressen arbeiten mehrstufig, d.h. es werden mehrere Schritte in einem Arbeitsgang durchgeführt, wie z.B. Scheren des Rohlings, Vorformen des Schraubenkopfes, Endstauchen, Entgraten und Reduzieren des Gewindeteils. In einem weiteren Schritt wird das Gewinde der Schraube spanlos mit einer Walzbacken geformt. Bei selbstbohrenden Schrauben wird die Bohrerspitze vor dem Gewindewalzen gequetscht. Zwischen den einzelnen Arbeitsschritten werden die Teile in einer speziell dafür vorgesehenen Waschanlage gewaschen. Je nach Produkt kann auch eine Härtung des Materials erfolgen. Abschließend wird die Schraubenoberfläche verzinkt und beschichtet. | ||
Modelling and validation
| Subtype | average dataset | ||||
| LCA methodology report | |||||
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| Documentation of data quality management | |||||
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| Compliance Declarations | |||||
| Compliance |
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Approval of overall compliance
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Nomenclature compliance
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Methodological compliance
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Review compliance
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Documentation compliance
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Quality compliance
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| Compliance |
Compliance system name
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Approval of overall compliance
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Nomenclature compliance
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Methodological compliance
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Review compliance
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Documentation compliance
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Quality compliance
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Administrative information
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| Data generator | |
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| Time stamp (last saved) | 2024-03-21T00:00:00 |
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| Publication and ownership | |
| UUID | d829265e-0858-4743-91cb-56a63fb7ed6a |
| Date of last revision | 2024-03-21T10:42:00+01:00 |
| Data set version | 00.02.002 |
| Registration authority | |
| Registration number | EPD-AWU-20230569-CBA1-DE |
| Owner of data set | |
| Copyright | Yes |
| License type | Free of charge for all users and uses |
| Access and use restrictions | None |
Environmental indicators
Indicators of life cycle