ahead in abrasives. introduction eurogrit bv eurogrit’s head-office in papendrecht the netherlands

ahead in abrasives

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


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


• Cleaning of the surface • Cleaning of the surface

• Creating a profile on the surface (anchor pattern)


• 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


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)


Preparation grade SA-1 Preparation grade SA-2

ISO 8501-1


Preparation grade SA-2½ Preparation grade SA-3

ISO 8501-1

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


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.


Roughness Rt: Maximum peak-to-valley height within the total

sample length.


Roughness Rz: Average peak-to-valley height within the total

sample length.


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


ISO standards

max. chloride content 0,0025% max. conductivity 25 mS/m (250 µS/cm)

Eurogrit

Max. 0,001%Max. 15 mS/m


Chlorides/salts have a very bad effect

on the lifetime of the coating system!


Adhesion failure Adhesion failure

Adhesion failure - Blistering - Undercutting


BlisteringBlistering



UndercuttingUndercutting


Standards

Non-metallic abrasives:

ISO 11126 (standards)

ISO 11127 (test methods)

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


Recycling

Can Eurogrit Aluminium Silicate be recycled?


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

ahead in abrasives

ahead in abrasives. introduction eurogrit bv eurogrit’s head-office in papendrecht the netherlands

Documents

surface grade

surface isosspcnacesa

proper surface preparation

surface preparation

surface preparation

mohsloose bulk density

valley height

blast cleaning abrasiveusually