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Ahead in abrasives. Introduction Eurogrit BV Eurogrit’s head-office in Papendrecht The Netherlands.

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Presentation on theme: "Ahead in abrasives. Introduction Eurogrit BV Eurogrit’s head-office in Papendrecht The Netherlands."— Presentation transcript:

1 ahead in abrasives

2 Introduction Eurogrit BV Eurogrit’s head-office in Papendrecht The Netherlands

3 Introduction Eurogrit BV Eurogrit’s production location in Dordrecht The Netherlands

4 Eurogrit Aluminium Silicate Coalslag Hardness : 7 mohs Loose bulk density : 1,3 / 1,4 kg per litre

5 Eurogrit Aluminium Silicate Coalslag Hardness : 7 mohs Loose bulk density : 1,3 / 1,4 kg per litre

6 Eurogrit Aluminium Silicate Coalslag Hardness : 7 mohs Loose bulk density : 1,3 / 1,4 kg per litre

7 Eurogrit Aluminium Silicate Coalslag Hardness : 7 mohs Loose bulk density : 1,3 / 1,4 kg per litre

8 Eurogrit Aluminium Silicate

9 ISO 9001 certification ISO standards and 11127

10 Abrasive blastcleaning Surface preparation is the most important single factor when a surface is to be protected by a film-forming material e.g. paint. Good and proper surface preparation will prolong the life-time of the paint Frosio’s Inspector’s book of reference Surface preparation is the most important single factor when a surface is to be protected by a film-forming material e.g. paint. Good and proper surface preparation will prolong the life-time of the paint Frosio’s Inspector’s book of reference

11 Abrasive blastcleaning Cleaning of the surface Creating a profile on the surface (anchor pattern )

12 Abrasive blastcleaning Cleaning of the surface Creating a profile on the surface (anchor pattern ) Creating a profile on the surface (anchor pattern )

13 Abrasive blastcleaning Cleaning of the surface Grade_AGrade_BGrade_CGrade_D

14 Abrasive blastcleaning Cleaning of the surface ISOSSPCNACE Sa 1=SSPC-SP-7 (Brush-Off Blast Cleaning) Sa 2=SSPC-SP-6NACE 3 (Commercial Blast Cleaning) Sa 2½ =SSPC-SP-10NACE 2 (Near-White Blast Cleaning) Sa 3=SSPC-SP-5NACE 1 (White Metal Blast Cleaning)

15 Abrasive blastcleaning Cleaning of the surface Preparation grade SA-1Preparation grade SA-2 ISO

16 Abrasive blastcleaning Cleaning of the surface Preparation grade SA-2½Preparation grade SA-3 ISO

17 Abrasive blastcleaning Cleaning of the surface

18 Abrasive blastcleaning Creating a profile on the surface (anchor pattern) Roughness / profile / anchor pattern Necessary for a proper adhesion of the paint depending on surface preparation method depending on blast cleaning abrasive Usually we are speaking of Rt, Rz or Ra

19 Abrasive blastcleaning Creating a profile on the surface (anchor pattern) Roughness Ra: Arithmetic average of the absolute values of the measured profile height deviations taken within the sampling length and measured from the graphical centreline.

20 Abrasive blastcleaning Creating a profile on the surface (anchor pattern) Roughness Rt: Maximum peak-to-valley height within the total sample length.

21 Abrasive blastcleaning Creating a profile on the surface (anchor pattern) Roughness Rz: Average peak-to-valley height within the total sample length.

22 Abrasive blastcleaning Creating a profile on the surface (anchor pattern) Roughness Rz: Z1 + Z2 + Z3 + Z4 + Z5 Rz = 5 (if the number of samples n=5) Zi = maximum peak-to-valley height of a single sample length.

23 Abrasive blastcleaning EUROGRIT A2 Ra 10.0 – 11.0 µm Rt 60 – 80 µm Rz 50 – 60 µm Ra 10.0 – 11.0 µm Rt 60 – 80 µm Rz 50 – 60 µm EUROGRIT A3 Ra 9.5 – 15 µm Rt 75 – 125 µm Rz 50 – 75 µm Ra 9.5 – 15 µm Rt 75 – 125 µm Rz 50 – 75 µm EUROGRIT B2 Ra 14 – 21 µm Rt 110 – 140 µm Rz 75 – 110 µm Ra 14 – 21 µm Rt 110 – 140 µm Rz 75 – 110 µm

24 Chlorides and Conductivity Chlorides/salts are coming from: Environment / Air Steel itself Abrasive Usually environment/air or steel, but also possible from the abrasive, especially Indian garnet and certain types of copperslag Standards for abrasives on:Conductivity Chloride content

25 Chlorides and Conductivity ISO standards max. chloride content 0,0025% max. conductivity 25 mS/m (250 µS/cm) Eurogrit Max. 0,001% Max. 15 mS/m

26 Chlorides and Conductivity Chlorides/salts have a very bad effect on the lifetime of the coating system!

27 Chlorides and Conductivity Adhesion failure Adhesion failure - Blistering - Undercutting

28 Chlorides and Conductivity Blistering Adhesion failure - Blistering - Undercutting

29 Chlorides and Conductivity Undercutting Adhesion failure - Blistering - Undercutting

30 Standards Non-metallic abrasives: ISO (standards) ISO (test methods)

31 Standards – Coal slag ISO

32

33 Health and Safety Therefore sand is forbidden as an abrasive in The Netherlands since 1957 and in most countries worldwide Free silica  Silicosis

34 Health and Safety Maximum free silica content : 1% Free silica Eurogrit aluminium silicate : < 0. 1%

35 Health and Safety No heavy metals Heavy metals / toxic elements No toxic elements No airborne metal concentrations Not harmful for the environment

36 Consumption and Recycling New steel (mill scale / lightly weathered): ±25-30 kgs / m² Coated/normally corroded steel: ±30-40 kgs / m² Severely corroded steel/heavy rust: ±40-50 kgs / m² For preparation standard SA-2½

37 Consumption and Recycling Recycling Can Eurogrit Aluminium Silicate be recycled?

38 Consumption and Recycling Recycling? Yes, but please take into account: Risk of contaminations, abrasive must be properly cleaned Recycling = extra handling = extra costs You must add about 30 to 40 % new material each time You must get the consent of your client and/or paint supplier to use recycled material to maintain warranty

39 Eurogrit BV In Summary The most important main issues to ensure no coating failure, assuming that the pressure, skills, etc are all optimum are:-  Surface preparation i.e. abrasives  Chloride tests  Moisture tests  Conductivity tests  Cleanliness tests

40 ahead in abrasives


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