Approval of Powder Coatings Quick Guide

Transcription

1 1. Definitions

2 2. Powder system for approval versus Corrosivity Class achievable The powder supplier can only request an approval for a Coating System Type defined in the table below. (yellow fieds) He has to define precisely the system targeted and to describe the process used to coat the panels provided (Chemical pretreatment or mechanical and complete pretreatment process including pretreatment process steps). Coating System Number Substrate Coating System Description Corrosivity Class Targeted (Only High for approval) C2 C3 C4 C5 ST1 ST2 Steel ST3 3 layers SZ1 SZ2 Sendzimir SZ3 3 layers HD1 HD2 HDG HD3 3 layers MS1 MS2 Metal Spray EC1 EC2 Electrophoretic

3 3. Test panels Test panels Purpose Substrate Application Dimensions Type A Mechanical tests Test panel + Coating System Type B Corrosion tests Substrate + Surface Preparation + Coating Systems Type C Florida EN AW Coating Systems Applied by laboratory at lowest curing conditions (lowest temperature, lowest corresponding time according TDS) Applied by the powder supplier or by the laboratory Applied by laboratory at lowest curing conditions (lowest temperature, lowest corresponding time according TDS) 105 x 190 x 0,75 mm (ref. GB26S/W/OC Etalon) Bare steel + zinc phosphate 140 x 70 x 2 mm Type x 100 x 2 mm

4 4. Tests Test Ref. QSC Type panel Norm Requirements Gloss 2-a-10 Type A ISO 2813 Within specifications of coating supplier Film thickness of metallic and organic coatings 2-a-9 Type A, B, C ISO ISO ISO Adhesion 2-a-1 Type B ISO ISO 2409 Direct Impact test 2-a-3 Type A + B ISO > 2,5 Nm According to system description Resistance to boiling water 2-b-3 Type B Norm EN b-3 (exception: MS1 and MS2) Resistance to mortar (*) 2-b-2 Type B ISO 2813 No changes Neutral Salt Spray test 2-b-4 Type B ISO 9227 See table point 5 Resistance to continuous 2-b-5 Type B ISO 6270 See table point 6 condensation Resistance to humid atmosphere 2-b-7 Type B ISO cycles only for C5I containing SO 2 Accelerated weathering test (*) 2-a-8 Type A ISO a-8 Natural weathering test Florida (*) 2-a-9 Type C ISO a-9 Determination of resistance to liquids 2-b-6 Type B ISO only for C5I (*)Not mandatory if Qualicoat approved topcoat

5 5. Requirements Salt Spray test EXTERIOR C3 H EXTERIOR C4 H EXTERIOR C5 H Coating System Type: ST1, ST2, ST3, EC1, EC2 (test with scribe) no rust breakthrough, M 2 mm after 480 h no rust breakthrough, M 2 mm after 720 h no rust breakthrough, M 2 mm after 1440 h Coating System Type: SZ1, SZ2, HD1, HD2, MS1, MS2 (test without scribe) no rust breakthrough after 480 h no rust breakthrough after 720 h no rust breakthrough after 1440 h 6. Requirements resistance to continuous condensation C2 INTERIOR C3 EXTERIOR C4 EXTERIOR C5 EXTERIOR 120 h 240 h 480 h 720 h

6 7. Number of test panels Type B required for the laboratory Working Group of Technical Committee Adhesion: 1 Direct impact: 1 (substrate not too thick, please) Resistance to boiling water: 3 (not necessary for metallic sprayed panels) Resistance to mortar: 3 (not necessary for Qualicoat approved powder) Neutral salt spray: 6 for C5 H, 5 for C4 H, 4 for C3 H Resistance to continuous condensation: 3 (for all categories) Resistance to humid atmospheres containing SO2: 3 (only for C5i) Resistance to liquids: 9 (only for C5i) Find in the table below the number of test panels Type B required for the laboratory. Coating System Number ST1 Substrate Coating System Corrosivity Class Targeted (Only High for approval) Description C2 C3 C4 C5M C5I 14 ST2 Steel ST3 3 layers SZ Sendzimir SZ HD HDG HD MS Metal Spray MS EC Electrophoretic EC If the topcoat is Qualicoat approved, take the number of test panels minus 3. (no mortar test needed on Type B)