AS NZS 3750.7 pdf download – Paints for steel structures Part 7: Aluminium paint
The paint shall comply with the requirements detailed in Clauses 2.2 to 2.6 inclusive. Theseproperties and requirements are summarized in Table 1.
The paint shall principally consist of appropriate leafing grade aluminium pigment, resinbinder and solvent.
2.3 CONDITIONS OF TEST
Unless otherwise specified in this Standard, the following test conditions shall apply:(a)The test panel material is steel complying with AS/NZS 1580.104.1. Where reference
panels are required, they should be made from the same material and be prepared byidentical methods as the test panels.
(b) The size and type of test panels shall be as specified in Table 1.(c) The dry film thickness shall be 25 um to 35 um.
(d)Conditions for testing shall be in accordance with AS/NZS 1580.101.5.(e)Conditions for air-drying shall be in accordance with AS/NZS 15184.108.40.206.4LIQUID PAINT
2.4.1 Condition in container
When examined in accordance with AS/NZS 1580.103.1 at the time of delivery from themanufacturer or supplier, the paint shall be free from gel, coarse particles, skins and foreignmatter. The product shall be readily re-incorporated when tested in accordance withAS/NZS 1580.211.2.
2.4.2 Volume solids
When determined in accordance with AS 1580.301.2,the volume solids shall be within5 percent of the product specification.
220.127.116.11 Degree of settling
When stored at 23 土3C in sealed,unopened containers for 12 months from the date ofmanufacture，the ratingfor the settlingwhen determined in accordance withAS/NZS 1580.211.1 shall be not less than 6.
18.104.22.168 Re-incorporation afier siorage
When stored at 23土3C in sealed,unopened containers for 12 months from the date ofmanufacture,and tested in accordance with AS/NZS 1580.211.2, the paint shall be readilyre-incorporated and be of uniform consistency free from lumps, gel and other defects.
2.5 APPLICATION PROPERTIES 2.5.1 General When applied in accordance with the manufacturer’s recommended methods of application, the applied film shall be free from defects and show good leafing and brightness, when tested by the appropriate method (see Clauses 2.5.2 to 2.5.4).
2.5.2 Brushing When applied to a vertical test panel (see Clause 2.3) in accordance with AS/NZS 1580.205.1, the test paint shall exhibit satisfactory brushing properties and be free from visible defects.
2.5.3 Rolling When applied to a vertical test panel (see Clause 2.3) in accordance with AS/NZS 1580.205.3, the test paint shall exhibit satisfactory rolling properties and be free from visible defects.
2.5.4 Spraying When thinned in accordance with the manufacturer’s instructions, and applied to a vertical test panel (see Clause 2.3) in accordance with AS/NZS 1580.205.2, the test paint shall exhibit good spraying properties. 2.6 APPLIED FILM 2.6.1 Surface-dry time When the test paint has been applied to a steel test panel at the appropriate spreading rate and is tested in accordance with AS/NZS 1580.401.1, it shall have a surface-dry time not exceeding 6 h.
2.6.2 Hard-dry time When the test paint has been applied to a steel test panel at the appropriate spreading rate and is tested in accordance with AS 1580.401.5, it shall have a hard-dry time not exceeding 16 h.
2.6.3 Recoating properties When a single-coated steel test panel is recoated after 24 h drying, and is examined in accordance with AS/NZS 1580.404.1, there shall be no defects in the underlying test film during or after overcoating. When examined, after drying for 24 h, the film shall be of uniform appearance and colour and shall be free from defects.
2.6.4 Resistance to weathering When test panels coated in accordance with Appendix E are continuously exposed for 48 months, at a 45° angle on an exposure rack complying with AS/NZS 1580.457.1, at a test site with climatic conditions that comply with AS/NZS 2312 for a Category C: Medium environment, the paint system shall meet the acceptance rating requirements of Table 2.
2.6.5 Resistance to water When a panel coated as described in Appendix E is tested in accordance with AS/NZS 1580.455.1 using an immersion time of 24 h, the test panel shall exhibit no sign of blistering, wrinkling or other defects. The test panel shall produce a scratch resistance of not less than 600 g as determined using AS/NZS 1580.403.1 and an approximate colour match between the immersed and unimmersed areas of the panel.