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ahead in abrasives
Introduction Eurogrit BV
Eurogrit’s head-office in Papendrecht
The Netherlands
Introduction Eurogrit BV
Eurogrit’s production location in Dordrecht
The 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 certification
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
Abrasive blastcleaning
• 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)
Abrasive blastcleaning
Cleaning of the surface
Grade_A
Grade_B
Grade_C
Grade_D
Abrasive blastcleaning
Cleaning of the surface
ISO
Sa 1
Sa 2
Sa 2½
Sa 3
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=
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SSPC
NACE
SSPC-SP-7
SSPC-SP-6
SSPC-SP-10
SSPC-SP-5
(Brush-Off Blast Cleaning)
NACE 3 (Commercial Blast Cleaning)
NACE 2 (Near-White Blast Cleaning)
NACE 1 (White Metal Blast Cleaning)
Abrasive blastcleaning
Cleaning of the surface
ISO 8501-1
Preparation grade SA-1
Preparation grade SA-2
Abrasive blastcleaning
Cleaning of the surface
ISO 8501-1
Preparation grade SA-2½
Preparation grade SA-3
Abrasive blastcleaning
Cleaning of the surface
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
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.
Abrasive blastcleaning
Creating a profile on the surface (anchor pattern)
Roughness Rt:
Maximum peak-to-valley height within the total
sample length.
Abrasive blastcleaning
Creating a profile on the surface (anchor pattern)
Roughness Rz:
Average peak-to-valley height within the total
sample length.
Abrasive blastcleaning
Creating a profile on the surface (anchor pattern)
Roughness Rz:
Rz =
Z1 + Z2 + Z3 + Z4 + Z5
5
(if the number of samples n=5)
Zi = maximum peak-to-valley height of a single sample length.
Abrasive blastcleaning
EUROGRIT A2
EUROGRIT A3
EUROGRIT B2
Ra 10.0 – 11.0 µm
Rt 60 – 80 µm
Rz 50 – 60 µm
Ra 9.5 – 15 µm
Rt 75 – 125 µm
Rz 50 – 75 µm
Ra 14 – 21 µm
Rt 110 – 140 µm
Rz 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
max. chloride content
max. conductivity
ISO standards
Eurogrit
0,0025%
25 mS/m (250 µS/cm)
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 - Blistering - Undercutting
Chlorides and Conductivity
Blistering
Adhesion failure - Blistering - Undercutting
Chlorides and Conductivity
Undercutting
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
Free silica  Silicosis
Therefore sand is forbidden as an abrasive in
The Netherlands since 1957 and in most
countries worldwide
Health and Safety
Free silica
• Maximum free silica content : 1%
• Eurogrit aluminium silicate : < 0.1%
Health and Safety
Heavy metals / toxic elements
• No heavy metals
• No airborne metal concentrations
• No toxic elements
• 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. abrasives
Chloride tests
Moisture tests
Conductivity tests
Cleanliness tests
ahead in abrasives