Surface Treatment & Corrosion Classification

The choice of surface treatment for the products should be made based on the conditions on the site. MEKA® product names include a code to indicate their surface treatment, e.g. KS20-200 L=6000 PG.

Plastic

White or colored plastic

Atmospheric- Corrosivity Category

C1–C2

 

Standard

Plastic products are made of through-dyed plastic granules, by either injection molding or extrusion. Plastic products are not surface-treated after manufacture.

M

MEKA product photo

Paint-coated product

Colour white RAL 9010

Atmospheric- Corrosivity Category

C1–C2

Standard

EN 10169

(steel products)

Paint-coated products may be e.g.
■ Pre-galvanised and painted steel products
■ Steel or aluminium products that have been painted or powder coated after manufacture

Polyester paint is used on steel and aluminium products, as its weather, corrosion and wear resistance properties are good.

B

Surface Treatment and Corrosion Classification B

Paint-coated product

Colour black RAL 9005

Atmospheric- Corrosivity Category

C1–C2

Standard

EN 10169

(steel products)

Paint-coated products may be e.g.
■ Pre-galvanised and painted steel products
■ Steel or aluminium products that have been painted or powder coated after manufacture

Polyester paint is used on steel and aluminium products, as its weather, corrosion and wear resistance properties are good.

AD

Anodised aluminium

Standard colour natural grey EN000

Atmospheric- Corrosivity Category

C1–C2

Standard

Anodised aluminium products are made of pre-anodised aluminium preform sheets, or the anodisation is applied to the final product. A protective oxide layers has been generated on the surface of anodised aluminium with anodising solution and an electrical current. This results in a hard surface that is resistant to wear.

AL

Aluminium

Atmospheric- Corrosivity Category

C1–C2

Standard

EN 573-3

Aluminium products are made of aluminium alloy with an extrusion machine. The products are not surface-treated separately after being manufactured.

EG

Steel, galvanised after manufacture

Atmospheric- Corrosivity Category

C1–C2

Standard

EN ISO 2081

Zinc layer strength on average 5-8µm

Electro-galvanised products are made of non-surface-treated steel. The final product, such as a whole wire mesh tray or an attaching part thereof is pre-treated and galvanised in an electrolytic basin. The zinc layer covers all surfaces of the product, including cutting surfaces and welding seams.

PG

Pre-galvanised
steel

Atmospheric- Corrosivity Category

C1–C2

Standard

EN 10346

Zinc layer strength on average 20µm

Pre-galvanised steel products are made of steel that is already galvanised. These products may also be called pre-galvanised, continuously galvanised or Sendzimir-galvanised.

HDG

Steel that has been dipped in molten zinc after manufacture (dip-galvanised)

Atmospheric- Corrosivity Category

C1–C4

Standard

EN ISO 1461

Zinc layer strength on average 45-55µm

Hot-dip galvanised products are made of non-surface treated steel. The final product, such as a whole cable tray or an attaching part thereof is pre-treated and dipped in molten zinc. These products may also be called dip-galvanised. The zinc layer covers all surfaces of the product, including cutting surfaces and welding seams.

XPG®

Hot-dip galvanized, specially coated steel

Atmospheric- Corrosivity Category

C1–C4

Standard

EN 10346

XPG products are made of zinc-based special alloy coated steel. The special mixture forms a thin and tight film on the coating, which improves corrosion protection. Corrosion protection is based on cathodic and mechanical protection.

HST

Acid-proof steel 

AISI 316L

Atmospheric- Corrosivity Category

C1–CX

Standard

EN 10088

Acid-proof steel products (HST) are made of acid-proof steel. Welded products are pickled after manufacture.

Corrosion Classification – EN ISO 12944

The standard SFS-EN ISO 12944-2 describes the corrosion classifications and zinc corrosion in these classes. The usage applications (indoors and outdoors) presented on this page are only for guidance. Every products applicability should be confirmed case by case basis. If you have any questions, please don´t hesitate to contact us.

Meka_corrosivity_categories_C1

Outdoors

Not for
outdoor use.

Indoors

Heated buildings
with a clean atmosphere, e.g. offices, schools and hotels.

Zinc Thickness Loss

≤ 0,1 µm per year

Recommended Surface Treatment

M, B, EG, PG

Meka_corrosivity_categories_C2

Outdoors

Atmospheres with a low level of pollution: mostly rural areas.

Indoors

Unheated buildings with a possibility for condensation, e.g. warehouses and sports halls.

Zinc Thickness Loss

> 0,1–0,7 µm per year

Recommended Surface Treatment

M, B, EG, PG

Meka_corrosivity_categories_C3

Outdoors

Industrial areas and coastal areas with moderate salinity.

Indoors

Production areas with high humidity and some atmospheric impurities, e.g. food product manufacturing plants.

 

Zinc Thickness Loss

> 0,7–2,1 µm per year

Recommended Surface Treatment

HDG, XPG®

Meka_corrosivity_categories_C4

Outdoors

Industrial areas and coastal areas with moderate salinity

Indoors

Chemical plants, swimming pools, coastal ship and boatyards.

 

Zinc Thickness Loss

> 2,1–4,2 µm per year

Recommended Surface Treatment

HDG, XPG®

Meka_corrosivity_categories_C5

Outdoors

Industrial areas with high humidity and aggressive atmosphere, and coastal areas with high salinity

Indoors

Buildings with almost permanent condensation and with high pollution

Zinc Thickness Loss

> 4,2–8,4 µm per year

Recommended Surface Treatment

HST

Meka_corrosivity_categories_CX

Outdoors

Offshore areas with high salinity, industrial areas with extreme humidity, and aggressive atmospheres, sub-tropical or tropical atmospheres.

Indoors

Industrial buildings with extreme humidity and aggressive atmosphere.

Zinc Thickness Loss

> 8,4–25 µm per year

Recommended Surface Treatment

HST

Product Groups by Atmospheric-Corrosivity Category

Meka_corrosivity_categories_C1

Cable Trunking
INSTAL®
INFORM®

Socket Poles
INSTAL®

Feeder Poles
INSTAL®

Meka_corrosivity_categories_C2

Cable Ladders
KS20 K PG
KS20 PG
KS60 PG

Cable Trays
KRA M / PG
KRB M / PG

Wire Mesh Trays
WMT EG

Lighting Support Rails MEK 70 S M / PG
MEK 70 K PG
AluMEK

Fastening Parts
M / EG / PG

Meka_corrosivity_categories_C3

Cable Ladders
KS20 HDG
KS60 HDG
KS80 HDG
KS80 SP2.0 HDG
KSE80 HDG
KSF80 HDG

Wire Mesh Trays
WMT HDG

Lighting Support Rails
MEK 70 K XPG

Fastening Parts
HDG / XPG®

Meka_corrosivity_categories_C4

Cable Ladders
KS20 HDG
KS60 HDG
KS80 HDG
KS80 SP2.0 HDG
KSE80 HDG
KSF80 HDG

Wire Mesh Trays
WMT HDG

Lighting Support Rails
MEK 70 K XPG

Fastening Parts
HDG / XPG®

Meka_corrosivity_categories_C5

Cable Ladders
HST KS80
HST KSE80
HST KSF80
HST KS20

Wire Mesh Trays
WMT HST

Lighting Support Rails
HST MEK 70

Fastening Parts
HST

Meka_corrosivity_categories_CX

Cable Ladders
HST KS80
HST KSE80
HST KSF80
HST KS20

Wire Mesh Trays
WMT HST

Lighting Support Rails
HST MEK 70

Fastening Parts
HST

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Instructions & downloads

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