EN 1670:2007
(Main)Building hardware - Corrosion resistance - Requirements and test methods
Building hardware - Corrosion resistance - Requirements and test methods
This European Standard specifies the requirements for the corrosion resistance of building hardware for doors, windows, shutters and curtain walling.
This European Standard provides a method of classification of corrosion resistance of building hardware based on performance in a neutral salt spray test (EN ISO 9227).
This European Standard specifies requirements for both coated and uncoated surfaces and five grades of corrosion resistance being laid down in accordance with the different conditions of use grades 1 to 5. A grade 0 is also included for which no requirements have been specified. Requirements for levels of corrosion resistance which are higher than those laid down for grade 5 have not been included in this European Standard and are subject to agreement where required.
This European Standard also applies to the metal fasteners required for fixing building hardware if specified.
Screws and fastenings which are sold with a hardware product which conforms to this European Standard should also conform to this European Standard.
NOTE 1 The term "grade" used in this European Standard corresponds to the term "class" which is used in ISO standards.
NOTE 2 There is seldom a direct relationship between resistance to the action of salt spray and resistance to corrosion in other media, because several factors influencing the progress of corrosion, such as the formation of protective films, vary greatly with the conditions encountered. Therefore, the test results should not be regarded as a direct guide to the corrosion resistance of the tested materials in all environments where these materials may be used. Also, the performance of different materials during the test should not be taken as a direct guide to the corrosion resistance of these materials in service.
The method described in this European Standard gives a means of checking that the comparative quality of a material, with or without corrosion protection, is maintained.
In addition, for quality contr
Schlösser und Baubeschläge - Korrosionsbeständigkeit - Anforderungen und Prüfverfahren
Diese Europäische Norm legt die Anforderungen an die Korrosionsbeständigkeit von Schlössern und Baubeschlägen für Türen, Tore, Fenster, Fensterläden und Vorhangfassaden fest.
Diese Europäische Norm enthält eine Klassifizierung der Korrosionsbeständigkeit von Baubeschlägen basierend auf dem Leistungsverhalten in der neutralen Salzsprühnebelprüfung (EN ISO 9227).
Diese Norm legt die Anforderungen sowohl für beschichtete als auch für unbeschichtete Oberflächen fest. Ent¬sprechend den unterschiedlichen Nutzungsbedingungen gibt es fünf Klassen der Korrosionsbeständigkeit (Klasse 1 bis 5). Darüber hinaus gibt es eine Klasse 0, für die keine Anforderungen festgelegt sind. An¬forderungen, die über die Klasse 5 hinausgehen, sind in dieser Norm nicht festgelegt. Sie müssen bei Bedarf vereinbart werden.
Die Anforderungen dieser Norm gelten darüber hinaus für die metallischen Befestigungselemente, die für die Montage von Schlössern und Baubeschlägen erforderlich sind, falls spezifiziert.
Schrauben und Befestigungselemente, die mit dem Beschlagprodukt zusammen verkauft werden, das dieser Europäischen Norm entspricht, sollten ebenfalls dieser Europäischen Norm entsprechen.
ANMERKUNG 1 Der Begriff Klasse ("grade" in der englischen Fassung dieser Norm) in dieser Europäischen Norm stimmt mit dem Begriff Klasse überein, wie er in ISO-Normen angewendet wird.
ANMERKUNG 2 Es gibt selten einen direkten Zusammenhang zwischen dem Korrosionswiderstand beim Salzsprühnebel und der Korrosionsbeständigkeit in anderen Medien, weil verschiedene Faktoren den Fortschritt der Korrosion beeinflussen, wie z. B. die Bildung von Schutzschichten, variieren diese aufgrund der anzutreffenden Bedingungen. Darum sollten die Prüfergebnisse nicht als direkte Leitlinie für den Korrosionsschutz der geprüften Werkstoffe in allen Umgebungen, in denen die Werkstoffe zur Anwendung kommen, angesehen werden.
Quincaillerie pour le bâtiment - Résistance à la corrosion - Exigences et méthodes d'essai
La présente Norme européenne spécifie les exigences de résistance à la corrosion de la quincaillerie pour portes, fenêtres, fermetures et façades rideaux.
La présente Norme européenne propose une méthode de classification de la résistance à la corrosion de la quincaillerie de bâtiment reposant sur la performance à l’essai au brouillard salin neutre (EN ISO 9227).
La présente Norme européenne spécifie des exigences à la fois pour les surfaces revêtues et pour les surfaces non revêtues, cinq grades de résistance à la corrosion étant fixés conformément aux diverses conditions d'utilisation (grades de 1 à 5). Elle inclut également un grade 0 pour lequel aucune exigence n'est spécifiée. Les exigences relatives à des niveaux de résistance à la corrosion plus élevés que ceux fixés pour le grade 5 n'ont pas été ajoutés à cette norme et doivent faire l'objet d'un accord lorsqu'ils sont exigés.
La présente Norme européenne s'applique aussi aux éléments de fixation métalliques, exigés, si nécessaire, pour monter la quincaillerie pour le bâtiment.
Les vis et éléments de fixation vendus avec un article de quincaillerie conforme à la présente Norme européenne doivent également être conformes à cette norme.
NOTE 1 Le terme de «grade» employé dans la présente Norme européenne correspond au terme de «classe» utilisé dans les normes ISO.
NOTE 2 Il y a rarement une relation directe entre la résistance à l’action du brouillard salin et la résistance à la corrosion dans d’autres milieux car plusieurs facteurs influent sur les progrès de la corrosion, tels que la formation de films protecteurs, qui varient grandement en fonction des conditions rencontrées. Il convient donc de ne pas considérer les résultats d’essai comme un guide direct de la résistance à la corrosion des matériaux soumis à l’essai dans tous les environnements où ces matériaux peuvent être utilisés.
Stavbno okovje - Korozijska odpornost - Zahteve in preskusne metode
General Information
Relations
Overview
EN 1670:2007, titled Building hardware - Corrosion resistance - Requirements and test methods, is a European Standard developed by CEN that establishes clear criteria for the corrosion resistance of building hardware components. This standard is essential for manufacturers and quality controllers dealing with hardware for doors, windows, shutters, and curtain walling. It defines performance requirements and testing protocols based on exposure to neutral salt spray (EN ISO 9227), providing a reliable measure for comparing corrosion resistance across different materials and coatings.
Key Topics
Corrosion Resistance Classification: The standard classifies corrosion resistance into six grades (0 to 5), where:
- Grade 0: No defined corrosion resistance
- Grade 1: Low corrosion resistance
- Grade 2: Moderate corrosion resistance
- Grade 3: High corrosion resistance
- Grade 4: Very high corrosion resistance
- Grade 5: Exceptionally high corrosion resistance
These grades correspond to different service conditions, from indoor dry environments to very severe outdoor exposure.
Test Methods: Testing is carried out using the neutral salt spray test as per EN ISO 9227. The duration of exposure varies with the corrosion resistance grade, ranging from 24 hours for grade 1 to 480 hours for grade 5.
Functional and Appearance Criteria: Products must retain full functionality after testing. Surfaces should show no tarnish, blackening, or unacceptable corrosion spots beyond defined limits. Blistering is assessed according to the EN ISO 4628-2 standard, with strict limits on blister density and size.
Scope of Application: Applies to both coated and uncoated hardware surfaces, including metal fasteners used for fixing building hardware. Screws and fasteners sold with hardware must also comply with the standard.
Marking and Documentation: Products must be marked clearly with the relevant corrosion resistance grade and EN 1670 designation, ensuring easy identification and traceability.
Applications
EN 1670:2007 is tailored for a wide range of building hardware applications where corrosion resistance is critical for durability and performance:
- Doors and Window Hardware: Ensures long-term protection against corrosion impacting locks, hinges, handles, and other components.
- Shutters and Curtain Walling: Assesses hardware exposed to outdoor and severe environments to maintain safety and aesthetic quality.
- Metal Fasteners: Guarantees screws, bolts, and fixing elements meet corrosion standards matching the hardware they secure.
- Architectural and Construction Industry: Supports manufacturers, designers, and specifiers in selecting materials and finishes suitable for specific environmental conditions.
- Quality Control and Assurance: Provides objective, reproducible test methods to measure performance and maintain manufacturing consistency.
Related Standards
EN 1670:2007 references and complements several other European and ISO standards that are relevant for corrosion testing and coating specifications:
- EN ISO 9227 - Neutral Salt Spray Test: Core method for corrosion resistance evaluation.
- EN ISO 4628-2 - Evaluation of Coating Degradation: Defines blistering assessment.
- EN ISO 4628-3 - Assessment of Degree of Rusting on Coated Surfaces.
- EN ISO 6988 - Testing corrosion by sulfur dioxide, referenced but excluded in EN 1670’s scope.
- ISO 1456, ISO 1458, and ISO 2081 - Standards for metallic coatings relevant to hardware finishes.
- EN ISO 10683 - Zinc flake coatings for fasteners.
- EN ISO 12944-2 - Classification of environments for corrosion protection.
These related standards form a comprehensive framework that supports the effective corrosion protection and longevity of building hardware products.
Keywords: EN 1670:2007, corrosion resistance, building hardware, salt spray test, neutral salt spray, door hardware corrosion, window hardware durability, coated surfaces, metal fasteners corrosion, corrosion testing methods, European Standard, hardware durability standards, corrosion grade classification.
Frequently Asked Questions
EN 1670:2007 is a standard published by the European Committee for Standardization (CEN). Its full title is "Building hardware - Corrosion resistance - Requirements and test methods". This standard covers: This European Standard specifies the requirements for the corrosion resistance of building hardware for doors, windows, shutters and curtain walling. This European Standard provides a method of classification of corrosion resistance of building hardware based on performance in a neutral salt spray test (EN ISO 9227). This European Standard specifies requirements for both coated and uncoated surfaces and five grades of corrosion resistance being laid down in accordance with the different conditions of use grades 1 to 5. A grade 0 is also included for which no requirements have been specified. Requirements for levels of corrosion resistance which are higher than those laid down for grade 5 have not been included in this European Standard and are subject to agreement where required. This European Standard also applies to the metal fasteners required for fixing building hardware if specified. Screws and fastenings which are sold with a hardware product which conforms to this European Standard should also conform to this European Standard. NOTE 1 The term "grade" used in this European Standard corresponds to the term "class" which is used in ISO standards. NOTE 2 There is seldom a direct relationship between resistance to the action of salt spray and resistance to corrosion in other media, because several factors influencing the progress of corrosion, such as the formation of protective films, vary greatly with the conditions encountered. Therefore, the test results should not be regarded as a direct guide to the corrosion resistance of the tested materials in all environments where these materials may be used. Also, the performance of different materials during the test should not be taken as a direct guide to the corrosion resistance of these materials in service. The method described in this European Standard gives a means of checking that the comparative quality of a material, with or without corrosion protection, is maintained. In addition, for quality contr
This European Standard specifies the requirements for the corrosion resistance of building hardware for doors, windows, shutters and curtain walling. This European Standard provides a method of classification of corrosion resistance of building hardware based on performance in a neutral salt spray test (EN ISO 9227). This European Standard specifies requirements for both coated and uncoated surfaces and five grades of corrosion resistance being laid down in accordance with the different conditions of use grades 1 to 5. A grade 0 is also included for which no requirements have been specified. Requirements for levels of corrosion resistance which are higher than those laid down for grade 5 have not been included in this European Standard and are subject to agreement where required. This European Standard also applies to the metal fasteners required for fixing building hardware if specified. Screws and fastenings which are sold with a hardware product which conforms to this European Standard should also conform to this European Standard. NOTE 1 The term "grade" used in this European Standard corresponds to the term "class" which is used in ISO standards. NOTE 2 There is seldom a direct relationship between resistance to the action of salt spray and resistance to corrosion in other media, because several factors influencing the progress of corrosion, such as the formation of protective films, vary greatly with the conditions encountered. Therefore, the test results should not be regarded as a direct guide to the corrosion resistance of the tested materials in all environments where these materials may be used. Also, the performance of different materials during the test should not be taken as a direct guide to the corrosion resistance of these materials in service. The method described in this European Standard gives a means of checking that the comparative quality of a material, with or without corrosion protection, is maintained. In addition, for quality contr
EN 1670:2007 is classified under the following ICS (International Classification for Standards) categories: 91.190 - Building accessories. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 1670:2007 has the following relationships with other standards: It is inter standard links to EN 1670:1998, EN 1670:2007/AC:2008. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 1670:2007 is associated with the following European legislation: EU Directives/Regulations: 305/2011, 89/106/EEC; Standardization Mandates: M/101. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Building hardware - Corrosion resistance - Requirements and test methodsStavbno okovje - Korozijska odpornost - Zahteve in preskusne metodeQuincaillerie pour le bâtiment - Résistance a la corrosion - Exigences et méthodes d'essaiSchlösser und Baubeschläge - Korrosionsbeständigkeit - Anforderungen und PrüfverfahrenTa slovenski standard je istoveten z:EN 1670:2007SIST EN 1670:2007en;fr;de91.190Stavbna opremaBuilding accessoriesICS:SIST EN 1670:20001DGRPHãþDSLOVENSKI
STANDARDSIST EN 1670:200701-julij-2007
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1670March 2007ICS 91.190Supersedes EN 1670:1998
English VersionBuilding hardware - Corrosion resistance - Requirements andtest methodsQuincaillerie pour le bâtiment - Résistance à la corrosion -Exigences et méthodes d'essaiSchlösser und Baubeschläge - Korrosionsbeständigkeit -Anforderungen und PrüfverfahrenThis European Standard was approved by CEN on 12 February 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1670:2007: E
Examples of service conditions for which the various grades of corrosion resistance are appropriate.9 Bibliography.10
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La norme EN 1670:2007, intitulée "Quincaillerie de bâtiment - Résistance à la corrosion - Exigences et méthodes d'essai", se distingue par son ample portée, traitant des exigences de résistance à la corrosion pour une variété de matériels de construction, y compris les portes, fenêtres, volets et murs rideaux. L'un des points forts de cette norme est la classification de la résistance à la corrosion, fondée sur des performances mesurées lors d'un test de brouillard salin neutre (EN ISO 9227). Cette approche systématique permet de classer les matériels en fonction de leur usage spécifique, avec cinq degrés de résistance à la corrosion établis, allant du grade 1 au grade 5, ce qui facilite le choix des matériaux en fonction des conditions d'utilisation. De plus, la possibilité d'un grade 0 ajoute une flexibilité pour des applications où aucune exigence n'est nécessaire. Ce qui ajoute de la pertinence à la norme EN 1670:2007 est son application aux fixations métalliques requises pour la mise en place de la quincaillerie de bâtiment, garantissant ainsi que tous les éléments, y compris les vis et les accessoires, respectent les exigences de résistance à la corrosion. Cela renforce l'intégrité des installations puisqu'il est essentiel que les composants associés soient également conformes à ces critères. Il est également important de noter que la norme précise qu'il peut souvent y avoir une relation indirecte entre la résistance aux projections de brouillard salin et la résistance à la corrosion dans d'autres milieux. Ce point souligne l'importance de considérer les résultats des tests comme des indicateurs de qualité comparative plutôt que comme des garanties absolues de résistance à la corrosion dans tous les environnements possibles. En résumé, la norme EN 1670:2007 offre un cadre robuste et bien défini pour évaluer la résistance à la corrosion des matériels de construction, permettant ainsi aux concepteurs et aux fabricants de sélectionner adéquatement leurs matériaux pour assurer une durabilité optimale et une qualité conforme aux exigences du marché.
Die Norm EN 1670:2007 ist eine wichtige europäische Norm, die die Anforderungen an die Korrosionsbeständigkeit von Baubeschlägen für Türen, Fenster, Rollläden und Vorhangfassaden festlegt. Ein herausragendes Merkmal dieser Norm ist ihr umfassender Ansatz zur Klassifizierung der Korrosionsbeständigkeit von Baubeschlägen, der auf den Ergebnissen des neutralen Salznebeltests (EN ISO 9227) basiert. Die Norm bietet eine klare Systematik zur Klassifizierung von Korrosionsbeständigkeit in fünf Grade, die entsprechend den unterschiedlichen Einsatzbedingungen festgelegt sind. Dies ermöglicht Herstellern und Nutzern, die geeigneten Bauelemente je nach Umgebung auszuwählen. Grade 1 bis 5 definieren spezifische Anforderungen, während Grad 0 für Materialien vorgesehen ist, für die keine besonderen Anforderungen bestehen. Dieser detaillierte Ansatz erhöht die Relevanz der Norm für die Architektur- und Bauindustrie, da sie eine gezielte Auswahl von Materialien in Abhängigkeit von den Einsatzbedingungen ermöglicht. Ein weiterer Vorteil der EN 1670:2007 ist ihre Anwendung auf metallische Befestigungselemente, die für die Montage von Baubeschlägen erforderlich sind, sofern dies in den Spezifikationen angegeben ist. Dies stellt sicher, dass die gesamten Systeme, bestehend aus Baubeschlägen und Befestigungen, konsistent und korrosionsbeständig sind. Die Norm betont auch die Notwendigkeit einer differenzierten Betrachtung der Korrosionsbeständigkeit. Sie weist darauf hin, dass es häufig keine direkte Beziehung zwischen der Widerstandsfähigkeit gegen Salznebel und der Korrosionsbeständigkeit in anderen Medien gibt. Das ist besonders wichtig, da die Korrosionsbedingungen variieren können und verschiedene Faktoren, wie der Schutzfilm, die Leistung der Materialien in der Praxis beeinflussen. Der methodische Ansatz der Norm gewährleistet, dass die Prüfung die vergleichbare Qualität eines Materials, mit oder ohne Korrosionsschutz, aufrechterhält. Die EN 1670:2007 bietet somit ein zuverlässiges Referenzinstrument sowohl für Hersteller als auch für Anwender in der Bauindustrie, um die Leistung und Haltbarkeit von Baubeschlägen unter korrosiven Bedingungen zu bewerten und auszuwählen.
SIST EN 1670:2007 표준은 건축 하드웨어의 내식성 요구 사항과 시험 방법을 규명하고 있습니다. 이 표준은 문, 창, 셔터 및 커튼 월에 사용되는 건축 하드웨어의 내식성 요구 사항을 명시하며, 내식성 분류를 위해 중성 염수 스프레이 시험(EN ISO 9227)을 기반으로 한 방법을 제공하고 있습니다. 이 표준은 코팅된 표면과 비코팅 표면 모두에 대한 요구 사항을 포함하며, 사용 조건에 따라 1부터 5까지의 다섯 가지 내식성 등급을 설정하고 있습니다. 등급 0은 지정된 요구 사항이 없는 경우를 포함하며, 등급 5를 초과하는 내식성 수준의 요구 사항은 포함되어 있지 않고, 필요 시 협의에 따라 적용됩니다. 또한, 건축 하드웨어를 고정하기 위해 필요한 금속 체결장치에도 이 표준이 적용됩니다. SIST EN 1670:2007의 강점 중 하나는 내식성을 평가하는 데 있어 사용자가 믿을 수 있는 기준을 제공한다는 점입니다. 내식성 시험은 다양한 자재의 성능을 비교하는 데 유용하며, 이는 건축 하드웨어의 질을 유지하는 데 도움을 줄 수 있습니다. 그러나 염수 스프레이 작용과 다른 매체의 부식 저항성 간에는 직접적인 관계가 거의 없다는 점도 주목할 필요가 있습니다. 따라서 시험 결과는 사용될 환경에서의 자재의 내식성을 직접적으로 지침으로 삼지 않아야 하며, 서로 다른 자재 간의 성능 비교도 주의 깊게 해석해야 합니다. 이 표준은 건축 분야에서의 내식성 요구 사항 및 시험 방법에 대한 권위 있는 기준으로, 건축 하드웨어의 내구성과 품질을 보장하기 위한 중요한 역할을 합니다. 이러한 이유로 SIST EN 1670:2007은 건축 하드웨어의 내식성을 확보하고자 하는 모든 산업 관계자에게 매우 관련성이 높은 표준입니다.
EN 1670:2007は、建材ハードウェアの腐食抵抗に関する要件と試験方法を定めた重要な欧州標準である。この標準の範囲は、ドア、窓、シャッターおよびカーテンウォール用の建材ハードウェアに適用され、特に腐食抵抗の分類について詳細に説明している。 本標準の強みは、腐食抵抗を評価するための中性塩スプレー試験（EN ISO 9227）を基にした分類方法を提供している点である。この試験方法は、建材ハードウェアが様々な使用条件下でどの程度腐食に耐えられるかを定量的に示すものであり、品質管理の一助となる。特に、コーティングされた表面と非コーティングの表面に対する要求事項が明確に定められており、グレード1から5までの異なる腐食抵抗の等級が規定されている。グレード0も含まれており、特定の要件が示されていない場合の取扱いも考慮されている。 また、EN 1670:2007は、建材ハードウェアを取り付けるための金属固定具にも適用される点が強調される。特に、ハードウェア製品と共に販売されるネジやファスニングも、この標準に準拠する必要があるため、製品の一貫性と信頼性が保証される。 ただし、塩スプレー試験の結果は、すべての環境における腐食抵抗を直接的に反映するものではない点も注意が必要である。腐食の進行に影響を与える要因が多く存在し、試験中の異なる素材の性能が必ずしもサービス時の腐食抵抗に直結しないことを考慮すべきである。このため、各材料の比較品質を確認する手段として、この標準が価値を持つ。 EN 1670:2007は、建材ハードウェアにおける腐食抵抗の重要性を再認識させるとともに、品質管理と安全性を高めるための信頼性のある指標を提供するものであり、業界内での関連性が非常に高い。
The EN 1670:2007 standard, entitled "Building hardware - Corrosion resistance - Requirements and test methods," delineates essential specifications for the corrosion resistance of building hardware utilized in doors, windows, shutters, and curtain walling. This standard is significant as it systematically classifies the corrosion resistance of building hardware through rigorous testing methods, specifically the neutral salt spray test (EN ISO 9227), which is a critical benchmark for assessing performance under defined conditions. One of the strengths of this standard is its comprehensive approach, addressing both coated and uncoated surfaces, allowing for a clear classification of corrosion resistance across five distinct grades (1 to 5). This grading system is pivotal for manufacturers and consumers alike, as it provides a standardized method for understanding the durability of building hardware under various environmental conditions. Additionally, the inclusion of a grade 0, which specifies no requirements, allows flexibility in the application of this standard while still maintaining a minimal baseline for quality assurance. Another notable aspect is the standard’s applicability to metal fasteners that are essential for securing building hardware. By ensuring that screws and fastenings sold alongside conforming hardware also meet these corrosion resistance requirements, EN 1670:2007 enhances overall performance consistency and reliability in construction applications. While the focus on salt spray testing is beneficial, it is important to acknowledge the standard’s advisory note, which cautions against assuming a direct correlation between salt spray resistance and performance in other corrosive environments. This insight reinforces the necessity for practitioners to consider broader environmental factors when evaluating material selections, thereby promoting informed decision-making in the selection of building hardware. In conclusion, EN 1670:2007 serves a critical role in establishing uniformity and quality in the construction industry regarding the corrosion resistance of building hardware. Its structured approach, detailed requirements, and clear classification system make it a relevant and vital standard for ensuring long-lasting and safe building components.
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