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Interior finishing screws
ENVIRONMENT CATEGORIES
The following tables provides a general guideline for the most common screw fastening applications . The appropriate corrosion protection for each fastening material is shown based on the typical atmospheric environments ( see notes ).
Screws |
PBH S |
PBH SD ZINC |
PBH S CRS |
PBH SD CRC |
|
PPH S |
PTH S ZINC |
KCOTE |
PWH SD CMT |
|
|
PBH S ZINC |
PBH S CRS |
|
|
|
|
KAITEX |
|
Coating / Material |
Phosphated |
Galvanic zinc |
Kwik-coat or |
Electro- or Kaitex |
|
carbon steel |
plated |
kaitex coated |
Duplex coated |
|
|
carbon steel |
carbon steel |
carbon steel |
Environmental conditions
Dry indoor
Indoor with temporary condensation
Outdoor with low pollution
Outdoor with mode rate concentration of pollutants
Coastal areas
Outdoor , areas with heavy industrial pollution
Close proximity to roads
Special applications
Fastened part
Steel ( zinc-coated , painted ), aluminium , stainless steel
Steel ( zinc-coated , painted ), aluminium , stainless steel
Steel ( zinc-coated , painted ), aluminium , stainless steel
Steel ( zinc-coated , painted ), aluminium , stainless steel
Steel ( zinc-coated , painted ), aluminium , stainless steel
Steel ( zinc-coated , painted ), aluminium , stainless steel
Steel ( zinc-coated , painted ), aluminium , stainless steel
Steel ( zinc-coated , painted ), aluminium , stainless steel
█ |
█ |
█ |
█ |
- |
- |
█ |
█ |
- |
- |
|
□ 2 )
|
- |
- |
|
□ 2 )
|
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
- |
█
□ 2 )
= expected lifetime of fasteners made from this material is typically satisfactory in the specified environment based on the typically expected lifetime of a building . The assumed service life in ETA approvals for screw fasteners is 25 years .
= a decrease in the expected lifetime of non-stainless fasteners in these atmospheres must be taken into account ( ≤ 25 years ). Higher expected lifetime needs a specific assessment .
= fasteners made from this material are not generally suitable in the specified environment . Exceptions need a specific assessment .
Corrosion resistance overview
Coating
Example of screws
Phosphated PBH S 24 Zinc plated PBH SD ZINC 24 - 48 Kwik cote PBH S CRS KCOTE 500
Kaitex
PBH S CRS KAITEX
Typical ASTM B117 Salt spray rating ( in hours )
500
Electro coating PBH SD CRC 1000 Kaitex duplex coating
PWH SD CMT 1000
Typical conditions of use
- Interior applications without any particular influence of moisture
- Interior applications which are in damp environments
- Interior applications which are in damp environments - Exterior applications in only slightly corrosive atmosphere
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