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Introduction Eurogrit BV
Eurogrit’s head-office in PapendrechtEurogrit’s head-office in Papendrecht
The NetherlandsThe Netherlands
Introduction Eurogrit BV
Eurogrit’s production location in DordrechtEurogrit’s production location in Dordrecht
The NetherlandsThe Netherlands
Eurogrit Aluminium Silicate
• Coalslag
• Hardness : 7 mohs
• Loose bulk density : 1,3 / 1,4 kg per litre
Eurogrit Aluminium Silicate
• Coalslag
• Hardness : 7 mohs
• Loose bulk density : 1,3 / 1,4 kg per litre
Eurogrit Aluminium Silicate
• Coalslag
• Hardness : 7 mohs
• Loose bulk density : 1,3 / 1,4 kg per litre
Eurogrit Aluminium Silicate
• Coalslag
• Hardness : 7 mohs
• Loose bulk density : 1,3 / 1,4 kg per litre
Eurogrit Aluminium Silicate
Eurogrit Aluminium Silicate
ISO 9001 certificationISO 9001 certificationISO standards 11126-4 and 11127 ISO standards 11126-4 and 11127
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
Abrasive blastcleaning
• Cleaning of the surface • Cleaning of the surface
• Creating a profile on the surface (anchor pattern)
Abrasive blastcleaning
• Cleaning of the surface
• Creating a profile on the surface (anchor pattern)• Creating a profile on the surface (anchor pattern)
Abrasive blastcleaningCleaning of the surface Cleaning of the surface
Grade_A Grade_B Grade_C Grade_D
Abrasive blastcleaningCleaning of the surface Cleaning of the surface
ISO SSPC NACE
Sa 1 = SSPC-SP-7 (Brush-Off Blast Cleaning)Sa 2 = SSPC-SP-6 NACE 3 (Commercial Blast Cleaning)Sa 2½ = SSPC-SP-10 NACE 2 (Near-White Blast Cleaning)Sa 3 = SSPC-SP-5 NACE 1 (White Metal Blast Cleaning)
Abrasive blastcleaningCleaning of the surface Cleaning of the surface
Preparation grade SA-1 Preparation grade SA-2
ISO 8501-1
Abrasive blastcleaningCleaning of the surface Cleaning of the surface
Preparation grade SA-2½ Preparation grade SA-3
ISO 8501-1
Abrasive blastcleaningCleaning of the surface Cleaning of the surface
Abrasive blastcleaningCreating a profile on the surface (anchor pattern)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
Abrasive blastcleaningCreating a profile on the surface (anchor pattern)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.
Abrasive blastcleaningCreating a profile on the surface (anchor pattern)Creating a profile on the surface (anchor pattern)
Roughness Rt: Maximum peak-to-valley height within the total
sample length.
Abrasive blastcleaningCreating a profile on the surface (anchor pattern)Creating a profile on the surface (anchor pattern)
Roughness Rz: Average peak-to-valley height within the total
sample length.
Abrasive blastcleaningCreating a profile on the surface (anchor pattern)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.
Abrasive blastcleaningEUROGRIT A2EUROGRIT A2Ra 10.0 – 11.0 µm
Rt 60 – 80 µmRz 50 – 60 µm
Ra 10.0 – 11.0 µmRt 60 – 80 µm
Rz 50 – 60 µm
EUROGRIT A3EUROGRIT A3Ra 9.5 – 15 µmRt 75 – 125 µmRz 50 – 75 µm
Ra 9.5 – 15 µmRt 75 – 125 µmRz 50 – 75 µm
EUROGRIT B2EUROGRIT B2Ra 14 – 21 µm Rt 110 – 140 µmRz 75 – 110 µm
Ra 14 – 21 µm Rt 110 – 140 µmRz 75 – 110 µm
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
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
Chlorides and Conductivity
Chlorides/salts have a very bad effect
on the lifetime of the coating system!
Chlorides and Conductivity
Adhesion failure Adhesion failure
Adhesion failure - Blistering - Undercutting
Chlorides and Conductivity
BlisteringBlistering
Adhesion failure - Blistering - Undercutting
Chlorides and Conductivity
UndercuttingUndercutting
Adhesion failure - Blistering - Undercutting
Standards
Non-metallic abrasives:
ISO 11126 (standards)
ISO 11127 (test methods)
Standards – Coal slag ISO 11126-4
Standards – Coal slag ISO 11126-4
Health and Safety
Therefore sand is forbidden as an abrasive in The Netherlands since 1957 and in mostcountries worldwide
Free silica SilicosisFree silica Silicosis
Health and Safety
• Maximum free silica content : 1%
Free silica Free silica
• Eurogrit aluminium silicate : < 0.1%
Health and Safety
• No heavy metals
Heavy metals / toxic elementsHeavy metals / toxic elements
• No toxic elements
• No airborne metal concentrations
• Not harmful for the environment
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
Consumption and Recycling
Recycling
Can Eurogrit Aluminium Silicate be recycled?
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
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. abrasivesChloride tests Moisture tests Conductivity testsCleanliness tests
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