Guide to AS/NZS 2312.1:2014

Wattyl PC Guide to AS/NZS 2312.1:2014
Guidelines for corrosion protection in accordance with AS/NZS 2312.1:2014
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The Australian/New Zealand Standard AS/NZS 2312.1:2014 “Guide to the protection of steel against atmospheric corrosion by the use of Protective Coatings” offer a recommended guide to the protection of steel against corrosion in a range of “atmospheric corrosivity categories”.

Protection of steel substrates is a major part of the Australian construction scene. Avoidance of the many pit falls that exist in achieving this goal is of considerable concern to designers, construction engineers and applicators alike.

The Wattyl Protective Coatings Guide to AS/NZS 2312.1:2014 is designed to provide a summary of applicable Wattyl coating systems with a guide to durability in the particular exposure environments nominated.

Additionally, Wattyl's capability include a wide range of specifications that are not confined to the systems supplied on this guide. To find out more, contact our Wattyl representatives.

Atmospheric Environments

When selecting an appropriate protective coating system, the atmospheric conditions in the location of the intended structure require consideration. A structure situated in an aggressive environment will require a much higher standard of corrosion protection than one in a benign environment. The environment will affect the corrosion of steel and the life of a coating system.

Corrosivity Categories	Corrosion Rate For Steel (µm/year)	Corrosion Rate For Zinc (µm/year)	Typical Exterior Environment	Examples of Interior Environments
C1: Very low	<1.3< /td>	<0.1< /td>	Few alpine areas	Offices, shops
C2: Low	1.3 to 25	0.1 to 0.7	Arid/rural/urban; at least 50km from coast of sources of pollution	Warehouses, sports halls
C3: Medium	25 to 50	0.7 to 2.1	Coastal areas with low salinity	Food processing plants, breweries, dairies
C4: High	50 to 80	2.1 to 4.2	Sea-shore (calm) up to 1km from coast	Swimming pools, livestock, buildings
C5-I : Very High (Industrial)	80 to 200	4.2 to 8.4	Aggressive Industrial areas, where environment may be acidic	Plating shops, chemical sites
C5-M: Very High (Marine)	80 to 200	4.2 to 8.4	Offshore and beachfront (rough seas and surf beaches)	-
CX	200 to 700	8.4 to 25	Shoreline (Severe Surf)	Adjacent to acidic processes
T: Inland Tropical	-	-	Non-coastal tropical environment with high heat and humidity such as QLD, NT, North West WA, PNG and Pacific Islands	-

Table Explained

System Number:

This refers to the AS/NZS 2312.1:2014 system designation for corrosivity based on coatings chemistry including Acrylics, Alkyd, Epoxy, Inorganic Zinc and much more. Wattyl's equivalent systems to the standard are reflected in this section.

Surface Preparation:

This section refers to the surface preparation standards required for the steel preparation prior to coating applications.

First Coat:

This section refers to the primer, the first layer of coating in providing adhesion and corrosion protection to the steel.

Second Coat:

This section refers to the intermediate or build coat, the second layer of coating in providing barrier protection and prevention of moisture ingress.

Third Coat:

This section refers to the top coat or finish coat, the third layer of coating in providing UV resistance, for long term durability and high impact aesthetics.

Nominated and Total DFT:

This section refers to the recommended coatings thickness to achieve the desired durability.

Durability / Years to first maintenance:

This section refers to the number of years of corrosion protection guaranteed to the structure prior to first coatings maintenance. This guarantee is dependent on the understanding that all coatings processes are complied with the standard and Wattyl recommendations.

Paint Systems for Steel - Atmospheric Exposure

Coating Specification									Durability - Years to first maintenance of paint component of duplex system
System No	Surface Preparation ‡	1st Coat		2nd Coat		3rd Coat		Total nominal DFT µm	Atmospheric corrosivity category
System No	Surface Preparation ‡	Wattyl Product	Nom DFT µm	Wattyl Product	Nom DFT µm	Wattyl Product	Nom DFT µm	Total nominal DFT µm	C1	C2	C3	C4	C5-i	C5-m	T
ACRYLIC - Latex, single pack
ACL1 9000	ST 3	All Purpose Primer	40	Wattyl Solagard	40	Wattyl Solagard	40	120	15+	5-15	2-5	-	-	-	2-5
ACL2 9001	SA 2½	Galvit EP100	75	Wattyl Solagard	40	Wattyl Solagard	40	155	25+	15-25	10-15	5-10	2-5	2-5	10-15
ACL2 9002	SA 2½	Galvit ES600	75	Wattyl Solagard	40	Wattyl Solagard	40	155	25+	15-25	10-15	5-10	2-5	2-5	10-15
ACL3 9003	SA 2½	Galvit EP100	75	Epinamel DTM985	125	Wattyl Solagard	40	240	*	25+	15-25	10-15	5-10	5-10	15-25
ACL3 9090	SA 2½	Galvit EP100	75	Epinamel EB600	125	Wattyl Solagard	40	240	*	25+	15-25	10-15	5-10	5-10	15-25
ACL3 9091	SA 2½	Galvit EP100	75	Epinamel DTS680	125	Wattyl Solagard	40	240	*	25+	15-25	10-15	5-10	5-10	15-25
ACL4 9004	SA 2½	Epinamel DTM985	250	Wattyl Solagard^	40	-	-	290	25+	15-25	10-15	5-10	2-5	2-5	15-25
ACRYLIC - Solvent borne catalyzed, two pack
ACC1 9005	ST 3	Epinamel DTM985	125	Paracryl IF540^	50	-	-	200	25+	10-25	5-10	2-5	-	-	5-10
ACC2 9006	SA 2½	Epinamel PR250	75	Paracryl IF540^	50	-	-	125	25+	15-25	10-15	5-10	2-5	2-5	10-15
ACC4 9009	SA 2½	Epinamel PR250	75	Epinamel DTM985	125	Paracryl IF540^	50	250	*	25+	15-25	10-15	5-10	5-10	15-25
ACC4 9092	SA 2½	Epinamel PR250	75	Epinamel EB600	125	Paracryl IF540^	50	250	*	25+	15-25	10-15	5-10	5-10	15-25
ACC4 9093	SA 2½	Epinamel PR250	75	Epinamel DTS680	125	Paracryl IF540^	50	250	*	25+	15-25	10-15	5-10	5-10	15-25
ACC5 9010	SA 2½	Galvit EP100	75	Epinamel DTM985	125	Paracryl IF540^	50	250	*	25+	15-25	10-15	5-10	5-10	15-25
ACC5 9094	SA 2½	Galvit EP100	75	Epinamel EB600	125	Paracryl IF540^	50	250	*	25+	15-25	10-15	5-10	5-10	15-25
ACC5 9095	SA 2½	Galvit EP100	75	Epinamel DTS680	125	Paracryl IF540^	50	250	*	25+	15-25	10-15	5-10	5-10	15-25
ACC5 9011	SA 2½	Galvit ES600	75	Epinamel DTM985	125	Paracryl IF540^	50	250	*	25+	15-25	10-15	5-10	5-10	15-25
ACC5 9096	SA 2½	Galvit ES600	75	Epinamel EB600	125	Paracryl IF540^	50	250	*	25+	15-25	10-15	5-10	5-10	15-25
ACC5 9097	SA 2½	Galvit ES600	75	Epinamel DTS680	125	Paracryl IF540^	50	250	*	25+	15-25	10-15	5-10	5-10	15-25
ACC6 9012	SA 2½	Galvit EP100	75	Epinamel DTM985	200	Paracryl IF540^	50	325	*	25+	25+	15-25	5-10	10-15	25+
ACC6 9098	SA 2½	Galvit EP100	75	Epinamel DTS680	200	Paracryl IF540^	50	325	*	25+	25+	15-25	5-10	10-15	25+
ACC6 9013	SA 2½	Galvit ES600	75	Epinamel DTM985	200	Paracryl IF540^	50	325	*	25+	25+	25+	5-10	15-25	25+
ACC6 9099	SA 2½	Galvit ES600	75	Epinamel DTS680	200	Paracryl IF540^	50	325	*	25+	25+	25+	5-10	15-25	25+
ALKYD
ALK1 9014	ST 3 / SA 2	All Purpose Primer	40	-	-	-	-	40	5+	0-5	-	-	-	-	-
ALK3 9016	ST 3 / SA 2	Duranamel PR9	75	Duranamel BR22^	40	-	-	115	15+	5-15	2-5	-	-	-	2-5
EPOXY - Very High Build (DFT:250µm to 500µm per coat)
EVH1 9081	SA 2½	Epinamel DTM985	250	-	-	-	-	250	25+	15-25	10-15	5-10	2-5	2-5	5-10
EVH2 9082	SA 2½	Epinamel DTM985	400	-	-	-	-	400	*	25+	15-25	10-15	5-15	5-15	10-15
EVH3 9083	SA 2½	Epinamel PR250	75	Epinamel DTM985	400	-	-	475	*	25+	15-25	10-15	5-15	5-15	10-15
EPOXY - High Build (DFT:125µm to 200µm per coat)
EHB3 9023	SA 2½	Epinamel PR250	75	Epinamel DTM985	200	-	-	275	*	25+	15-25	10-15	5-15	5-15	10-15
EHB3 9100	SA 2½	Epinamel PR250	75	Epinamel DTS680	200	-	-	275	*	25+	15-25	10-15	5-15	5-15	10-15
EHB4 9024	SA 2½	Galvit EP100	75	Epinamel DTM985	200	-	-	275	*	25+	15-25	10-15	5-10	5-10	10-15
EHB4 9101	SA 2½	Galvit EP100	75	Epinamel DTS680	200	-	-	275	*	25+	15-25	10-15	5-10	5-10	10-15
EHB4 9025	SA 2½	Galvit ES600	75	Epinamel DTM985	200	-	-	275	*	25+	15-25	10-15	5-10	5-10	10-15
EHB4 9102	SA 2½	Galvit ES600	75	Epinamel DTS680	200	-	-	275	*	25+	15-25	10-15	5-10	5-10	10-15
EHB5 9026	SA 2½	Epinamel PR250	75	Epinamel DTM985 MIO	125	Epinamel DTM985 MIO	125	325	*	25+	15-25	10-15	10-15	10-15	10-15
EHB5 9103	SA 2½	Epinamel PR250	75	Epinamel EB600 MIO	125	Epinamel EB600 MIO	125	325	*	25+	15-25	10-15	10-15	10-15	10-15
EHB6 9027	SA 2½	Galvit EP100	75	Epinamel DTM985 MIO	125	Epinamel DTM985 MIO	125	325	*	25+	25+	25+	10-15	15-25	10-25
EHB6 9104	SA 2½	Galvit EP100	75	Epinamel EB600 MIO	125	Epinamel EB600 MIO	125	325	*	25+	25+	25+	10-15	15-25	10-25
EHB6 9028	SA 2½	Galvit ES600	75	Epinamel DTM985 MIO	125	Epinamel DTM985 MIO	125	325	*	25+	25+	25+	10-15	15-25	10-25
EHB6 9105	SA 2½	Galvit ES600	75	Epinamel EB600 MIO	125	Epinamel EB600 MIO	125	325	*	25+	25+	25+	10-15	15-25	10-25
EPOXY MASTIC - Surface Tolerant
EPM3 9032	ST 3	Epinamel DTM985	200	Epinamel DTM985	200	-	-	400	*	15-25	10-15	5-10	2-5	2-5	10-15
INORGANIC ZINC SILICATE
IZS1 9033	SA 2½	Galvit ES600	75	-	-	-	-	75	25+	25+	15-25	10-15	2-5	5-10	15-25
POLYURETHANE - Solvent borne, two pack
PUR1 9034	ST 3	Epinamel DTM985	125	Poly U400^	50	-	-	175	*	10-15	5-10	2-5	-	-	5-15
System No	Surface Preparation ‡	Wattyl Product	Nom DFT µm	Wattyl Product	Nom DFT µm	Wattyl Product	Nom DFT µm	Total nominal DFT µm	C1	C2	C3	C4	C5-i	C5-m	T
System No	Surface Preparation ‡	1st Coat		2nd Coat		3rd Coat		Total nominal DFT µm	Atmospheric corrosivity category

Notes:

All sharp edges, welds, corners, bolts, nuts holes etc shall be stripe coated by brush with each coat prior to full coat application.
Where coating is under immersion and/or buried, testing for holidays/pinholes in accordance with Information Sheet I-23 is required.
To prevent coating damage, clean up all spills immediately.
Refer to Wattyl Protective Coatings document I-19 Tank Lining Resistance Guide for suitable cargoes.

(^) Some colours may require multiple coats to achieve desired film build and opacity
(-) Not applicable
(^*) Suitable for this category but not economical
(^‡) Refer to AS1627.1, AS1627.2, AS1627.4 and AS1627.9

The information on this page was correct at the time of publishing - Jul 23, 2025

Guide to AS/NZS 2312.1:2014

Wattyl PC Guide to AS/NZS 2312.1:2014

Atmospheric Environments

Table Explained

Paint Systems for Steel - Atmospheric Exposure