Organic Zinc Rich coating for steel - APAS-PCCP

1 Specification 2916 Organic zinc - rich coating for the long term protection of steel Rev. No. 8 20 June, 2007 Authorised by Executive Officer, apas page 1 of 4 Copyright apas 2007 Editorial Note - This version of this specification introduces sub-classes in and clarifies testing requirements to allow Interim approvals. apas Document D188 should be read to obtain a broad overview of the Australian Paint Approval Scheme ( apas ). Manufacturers who wish to participate in apas within Australia should consult apas documents D177 (for Australian manufacturers), D178 (for overseas manufacturers) & D180 (for toll manufacturers). Manufacturers who wish to participate in apas within their own countries should consult apas document D175. apas approval to this specification may be gained by compliance with the requirements detailed in this specification and those in document D192 The apas Product Approval System.

2 All apas Documents may be downloaded from the apas web site located at: 1. Scope Description and guide for users This specification covers Organic zinc rich coatings for application to steel structures on which optimum surface preparation can be achieved or in situations where frequent maintenance is impractical. Complying products may be either one or two-pack products. The traditional two-pack products are intended for use as a primer in a full coating system. The one-pack products may be used either as a primer for a mixed system (primer plus other type of topcoat) or a one-product system not requiring topcoating to achieve the listed performance properties. 2916/1 products have a zinc content between 85% and 94% by mass and are typically applied at 65 75 m DFT. 2916/2 products typically have zinc content in excess of 94% by mass and may be applied at builds between 60 and 180 m DFT.

3 Both sub-classes of products are intended for the long term protection of steel principally in atmosphere. However, some products may also be suitable for immersion service refer manufacturer s data sheets. The apas approval of such products is indicated by the appropriate suffix 2916S for saltwater immersion; 2916F for fresh water immersion; 2916P for potable water immersion. Depending on the system chosen, a service life in excess of 10 years under Category C (Medium) atmospheric corrosivity conditions (refer AS/NZS 2312 table ) can be expected. Where surface preparation is likely to be marginal and surface tolerant coatings are required, reference should be made to specification apas 0156. The manufacturer's printed data sheet should confirm that the exposure conditions to which the coating system is to be exposed is within the capabilities of that system.

4 Sub-classes2916/1 Primer one- or two-pack products intended for use as the primer in a coating system. 2916/2 Durable topcoat single pack products that may be used either as a primer (for other types of topcoats) or as a durable single product system. Basis of this specification 2916/1 complies with AS/NZS Organic zinc rich primer except that the exterior durability requirement is increased from 48 to 72 months. 2916/2 not based on any known standard or specification 2. Other relevant documents Compliance2916/1 Paints approved under this specification conform to Paint Reference Number (PRN) C02 of AS/NZS 2312. Systems using a primer that complies with this specification are referenced in table of AS/NZS 2312. 2916/2 Paints approved under this specification are not covered by AS/NZS 2312 at this time. Referenced documentsThis specification makes reference to; AS/NZS 1580 Paints and related materials - Methods of test AS/NZS 2312 Guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings.

5 AS/NZS Paints for steel structures Part 9: Organic zinc - rich primer available in Australia from Standards Australia in all capital cities (and on-line at ). In New Zealand, they are available from Standards New Zealand offices. Uniform Paint Standard (Appendix I of the Standard for the Uniform Scheduling of Drugs & Poisons), available from Australian Government Info bookstores in all capital cities. 3. Compositional Requirements BinderThe binder composition is not restricted by this specification but for 2916/1 will typically be an Organic entity such as epoxy. VolatilesThe volatile portion shall principally be comprised of hydrocarbons. PigmentationThe pigmentation shall be chosen to impart the properties detailed in Table 1 below. Colour requirementsProducts approved under this specification are normally only available in grey.

6 The standard of decorative properties of these coatings is expected to be low. 4. Requirements for Product Approval General requirementsThe product and its application for approval shall comply with the relevant requirements of apas Document D192 during the life of the approval. Technical requirementsThe product shall comply with all the requirements of Table 1 below. Note 1: Interim approval may be granted provided that minimum conditions specified in Table 1 Note 2 below have been met. Safety & environmental requirementsThe product shall comply with the requirements of clause of apas Document D192. Read the Material Safety Data Sheet for the product before use and comply with the relevant state regulations. Many of these paints contain flammable solvents and should be stored away from all sources of heat or ignition. 2916 Revision no. 8 - 20 June, 2007 Authorised by Executive Officer, apas page 2 of 4 Copyright apas 2007 2916 Revision no.

7 8 - 20 June, 2007 Authorised by Executive Officer, apas page 3 of 4 Copyright apas 2007 Containers should be resealed immediately after use and good ventilation provided during use to minimise the risk of fire or explosion and the long term toxic effects of absorption of the vapour into the lungs. Care should be taken to avoid contact with the skin by the use of protective clothing and barrier cream. All pumping equipment should be adequately earthed. It is anticipated that most of these products would be applied by operators in well ventilated spray booths or in the field by operators with adequate safety equipment. Table 1 Performance Requirements TEST AS/NZS 1580 METHOD REQUIREMENTS FOR EACH COMPONENT: Preliminary examination Shall be free of coarse particles, gel and foreign matter. Storage stability AS/NZS A sample stored for 12 months at ambient temperature shall be readily incorporated to produce a uniform, lump-free mixture suitable for application.

8 WET PAINT TESTS: (Mixed two pack products) General AS/NZS Section 2 Shall comply with all clauses. The result of each parameter shall be reported. (Note that the Resistance to Weathering test (clause ) is modified as below). For one component 2916/2 products the following clauses shall not apply; Pot life assessment Volume Solids Theoretical calculation To be recorded VOC content Theoretical calculation to be recorded on D182 Thinning or mixing properties Using 10% of manufacturers recommended thinner there shall be no signs of incompatibility. Aged application or The aged samples, when mixed & sprayed according to the manufacturer's recommendation, shall produce a uniform finish typical of the product type. DRY FILM TESTS: (65 75 m DFT) Specular gloss (60 ) To be recorded Impact Resistance Method A 2kg mass falling from 40cm direct impact shall show no signs of film cracking or adhesive failure Adhesion Method B Less than or equal to rating 1.

9 2916 Revision no. 8 - 20 June, 2007 Authorised by Executive Officer, apas page 4 of 4 Copyright apas 2007 TEST AS/NZS 1580 METHOD REQUIREMENTS Interim accelerated weathering2 ASTM 5894 2616/1 After 1000h the ratings shall be; Checking 0 Cracking 0 Blistering 0 Flaking & peeling 0 Visible corrosion 0 2616/2 After 2000h the ratings shall be; Checking 0 Cracking 0 Blistering 0 Flaking & peeling 0 Visible corrosion 0 Resistance to weathering After 72 months exposure at all 3 atmospheric exposure sites nominated in Note 2 of D192 the ratings shall be; Checking 0 Cracking 0 Blistering 0 Flaking & peeling 0 Visible corrosion 0 Resistance to immersion - salt & fresh water (for 2916F and 2916S approvals only) After 48 months exposure at an appropriate site, the ratings for the coating shall be. Checking 0 Cracking 0 Blistering 0 Flaking & peeling 0 Corrosion 1 Final accelerated weathering ASTM 5894 2616/1 After 2000h the ratings shall be; Checking 0 Cracking 0 Blistering 0 Flaking & peeling 0 Visible corrosion 1 2616/2 After 4000h the ratings shall be; Checking 0 Cracking 0 Blistering 0 Flaking & peeling 0 Visible corrosion 0 Note 2: Interim approval may be granted provided that 1.

10 All properties in Table 1 with the exception of Resistance to Weathering & Final Accelerated Weathering &/or Resistance to Immersion have been tested for and shown to comply with stated requirements, AND 2. appropriate case histories of at least 4yrs duration complying with apas D192 Appendix B, are supplied.