AS 4848.1:2019 pdf download.Application specifications for coating systems Part 1: Single coat inorganic (ethyl) zinc silicate ——Solvent-borne.
3 Terms and definitions
For the purpose of this Standard, the terms and definitions of AS/NZS 2310 and those below apply.
3.1 coating system single-coat, solvent-borne, inorganic (ethyl) zinc silicate
3.2 competent person person who has, through a combination of training, education and experience, acquired knowledge and skills enabling that person to correctly perform a specific task
3.3 inorganic zinc silicate coating solvent-borne, inorganic zinc silicate coating consisting essentially of a dispersion of metallic zinc dust in an ethyl silicate medium Note 1 to entry: An “inorganic zinc silicate coating” is subsequently referred to as the “coating”.
3.4 inspection and test plan plan describing critical points at the various stages of the coating process for scheduled inspections and verifications
3.5 manufacturer supplier or manufacturer of coatings whose name appears on the product datasheets and the safety data sheets (SDS)
4 Selection of coating system
This Standard covers the three single-coat systems of different coating thickness, listed in Table 1. The coating systems and designations are identical to those provided in AS 2312.1. The designation of this Standard (AS 4848.1) along with the appropriate coating system designation shall be provided in the purchasing requirements, the construction specification or on the relevant drawing. If no system designation is given, the requirements of IZS1 shall apply. Apart from coating thickness, all other requirements listed in Clauses 5 to 11 of this Standard apply to all three systems. The coating system used shall be one of the three specified in Table 1. Single coat solvent-borne inorganic zinc silicate coatings are normally specified for marine and humid atmospheric environments. They should not be used for acidic or alkaline environments, nor submerged or underground environments.
IZS1 is most commonly used and is suitable for AS 4312 Cl to C4 environments. IZS4 is usually only specified for AS 4312 C4 to CX environments or where very long durability is required. Not all suppliers provide a product suitable for application to this thickness. HR3 is used for exposure to dry heat to 400 °C (with excursions up to 540 °C permitted), such as steel smokestacks. Zinc coatings are unsuitable for exposure to hot water and should not be used under thermal insulation. If there is any doubt, specific advice should be sought from coating manufacturers or expert consultants regarding selection of the correct system.
5 Selection of coating material
The coating material shall conform to the requirements for Type 4 inorganic zinc silicate paint stipulated in AS/NZS 3750.15.6 Preliminary activities The following preliminary activities shall be undertaken prior to the commencement of work:
(a) Supply all coating materials, labour, abrasives, consumables, safe storage facilities, equipment, inspection and safety equipment to perform the work scope in accordance with this Standard.
(b) Prepare work Inspection and Test Plan (ITP) documents for each procedure including repairs.
(c) Ensure personnel have a thorough understanding of all requirements of this Standard, the contents of all Manufacturer’s Product Data Sheets (PDS) and Safety Data Sheets (SDS).
(d) Ensure that technical assistance is available, when the need arises, from the manufacturer or other authority as appropriate.
(e) Protect the environment, facilities and all personnel from contamination, damage or injury caused by the applicator’s activities.
(f) Where requested, three mild steel test reference panels (approximately 500 mm x 500 mm x 3 mm) for the approved coating system shall be prepared in accordance with Clauses 7 and a of this Standard.
(g) Prepare and maintain quality assurance and other coating work-related records in accordance with AS 3894, Parts 10 to 14.
7 Surface preparation
The following activities shall be undertaken during surface preparation: (a) All sharp edges shall be ground flat. All weld defects such as spatter, undercut, rough beads, etc. shall be removed by grinding or weld repair. Any defects which show up after blast cleaning shall be repaired and re-blasted. Where intermittent welds cannot be adequately prepared or coated, additional treatment procedures shall be provided.AS 4848.1 pdf download.