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3 . ENVIRONMENT CATEGORIES
Applications can be classified in various environment categories , taking the following main factors into account :
Indoor applications
Dry indoor environments ( heated or air-conditioned areas ) without condensation , e . g . office buildings , schools
Indoor environments with temporary condensation ( unheated areas without pollutants ), e . g . storage sheds
Outdoor applications
Outdoor , rural or urban environment with low pollution Large distance (> 6 miles [ 10 km ]) from the sea
Outdoor , rural or urban environment with moderate concentration of pollutants and / or salt from sea water Distance from the sea 0.6-6 miles [ 1-10 km ]
Coastal areas Distance from the sea < 0.6 miles [ 1 km ]
Outdoor , areas with heavy industrial pollution Close to plants < 0.6 miles [ 1 km ] ( e . g . petrochemical , coal industry )
Close proximity to roadways treated with de-icing salts Distance from roadways < 33 feet [ 10 meters ]
Special applications
Special applications Areas with special corrosive conditions , e . g . road tunnels with de-icing salt , indoor swimming pools , special applications in the chemical industry ( exceptions possible ).
Important notes
The ultimate decision on the required corrosion protection must be made by the customer . Hilti accepts no responsibility regarding the suitability of a product for a specific application , even if informed of the application conditions . The tables are based on an average service life for typical applications . For metallic coatings , e . g . zinc layer systems , the end of lifetime is the point at which red rust is visible over a large fraction of the product and widespread structural deterioration can occur – the initial onset of rust may occur sooner . National or international codes , standards or regulations , customer and / or industry specific guidelines must be independently considered and evaluated .
These guidelines apply to atmospheric corrosion only . Special types of corrosion , such as crevice corrosion or hydrogen assisted cracking must be independently evaluated .
The tables published in this brochure describe only a general guideline for commonly accepted applications in typical atmospheric environments . Suitability for a specific application can be significantly affected by localized conditions , including but not limited to :
• Elevated temperatures and humidity
• High levels of airborne pollutants
• Direct contact with corrosive products , such as found in some types of chemically-treated wood , waste water , concrete additives , cleaning agents , etc .
• Direct contact to fresh / young concrete ( less than 28 days old )
• Electrical current
• Contact with dissimilar metals
• Confined areas , e . g . crevices
• Physical damage or wear
• Extreme corrosion due to combined effects of different influencing factors
• Enrichment of pollutants on the product
12 Interior finishing screw – Technical manual – 04 / 22 www . hilti . com