SIST EN 4637:2010

SLOVENSKI STANDARD
01-julij-2010
Aeronavtika - Peskalna sredstva - Beli korund
Aerospace series - Blast media - White corundum
Luft- und Raumfahrt - Strahlmittel - Edelkorund, weiß
Série aérospatiale - Produit de projetage - Corindon blanc
Ta slovenski standard je istoveten z: EN 4637:2010
ICS:
49.040 Prevleke in z njimi povezani Coatings and related
postopki, ki se uporabljajo v processes used in aerospace
letalski in vesoljski industriji industry
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 4637
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2010
ICS 49.040
English Version
Aerospace series - Blast media - White corundum
Série aérospatiale - Produit de projetage - Corindon blanc Luft- und Raumfahrt - Strahlmittel - Edelkorund, weiß
This European Standard was approved by CEN on 6 January 2010.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4637:2010: E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Terms and definitions .4
4 Characteristics .4
Annex A (normative) Characteristics of corundum .5
Annex B (normative) Tyler type splitting method . 34
Annex C (normative) Stack Splitting Method . 36

Foreword
This document (EN 4637:2010) has been prepared by the Aerospace and Defence Industries Association of
Europe - Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this Standard has
received the approval of the National Associations and the Official Services of the member countries of ASD,
prior to its presentation to CEN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by October 2010, and conflicting national standards shall be withdrawn at
the latest by October 2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

1 Scope
This standard specifies the characteristics of white corundum used as blast media for aerospace applications.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 565, Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal sizes of
openings
ISO 8486-1, Bonded abrasives — Determination and designation of grain size distribution — Part 1:
Macrogrits F4 to F220
ISO 8486-2, Bonded abrasives — Determination and designation of grain size distribution — Part 2:
Microgrits F230 to F2000
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
d max.
s3
the grain size (theoretical grain diameter) must not exceed the maximum permissible d -value at the 3 %
s3
point of the grain size distribution curve
3.2
d
s50
the median grain size (theoretical grain diameter) must be within the specified tolerances of the d -value at
s50
the 50 % point of the grain size distribution curve
3.3
d min.
s94
the grain size (theoretical grain diameter) must at least attain the d -value at the 94 % point of the grain size
s94
distribution curve
4 Characteristics
The characteristics for each product are specified in the following annexes.
Annex A
(normative)
Characteristics of corundum
DESIGNATION: White corundum F 12
Main use:
GRAIN SIZE: 1,20 mm to 2,80 mm
(for information)
DESCRIPTION: fused aluminium oxide
– Surface preparation
ASPECT:
– Surface reconditioning
MATERIAL: Ground corundum
COLOUR: White
1 ORIGIN: Artificial
2 CHEMICAL COMPOSITION: - Alumina ≥ 99 %
- Free silica < 0,1 %
3 CONTROLLED CHEMICAL COMPONENTS: None
4 GRAIN SHAPE: Angular and massive grain
5 HARDNESS (typical values): 2 100 kg/mm (Knoop hardness)
9 (Mohs hardness)
6 DENSITY: - True with pyknometer
- ≥ 3 940 kg/m
7 GRAIN SIZE DISTRIBUTION:
GRAIN SIZE DISTRIBUTION ISO 565
TEST SIEVES - APERTURE 2,80 mm 2 mm 1,40 mm
% RESIDUE
0 ≤ 20 ≥ 70
TEST SIEVES - APERTURE 1,20 mm

% REMAINDER
≤ 3
8 METHOD OF DETERMINATION OF GRAIN SIZE DISTRIBUTION: according to ISO 8486-1
(for sampling methods, see Annexes B and C of this standard).
9 SPECIAL INSTRUCTIONS: None.
DESIGNATION: White corundum F 14
Main use:
GRAIN SIZE: 1 mm to 2,40 mm
(for information)
DESCRIPTION: fused aluminium oxide
– Surface preparation
ASPECT:
– Surface reconditioning
MATERIAL: Ground corundum
COLOUR: White
1 ORIGIN: Artificial
2 CHEMICAL COMPOSITION: - Alumina ≥ 99 %
- Free silica < 0,1 %
3 CONTROLLED CHEMICAL COMPONENTS: None
4 GRAIN SHAPE: Angular and massive grain
5 HARDNESS (typical values): 2 100 kg/mm (Knoop hardness)
9 (Mohs hardness)
6 DENSITY: - True with pyknometer
- ≥ 3 940 kg/m
7 GRAIN SIZE DISTRIBUTION:
GRAIN SIZE DISTRIBUTION ISO 565
TEST SIEVES - APERTURE 2,40 mm 1,70 mm 1,20 mm
% RESIDUE 0
≤ 20 ≥ 70
TEST SIEVES - APERTURE 1 mm
% REMAINDER
≤ 3
8 METHOD OF DETERMINATION OF GRAIN SIZE DISTRIBUTION: according to ISO 8486-1
(for sampling methods, see Annexes B and C of this standard).
9 SPECIAL INSTRUCTIONS: None.
DESIGNATION: White corundum F 16
Main use:
GRAIN SIZE: 850 µm to 2 mm
(for information)
DESCRIPTION: fused aluminium oxide
– Surface preparation
ASPECT:
– Surface reconditioning
MATERIAL: Ground corundum
COLOUR: White
1 ORIGIN: Artificial
2 CHEMICAL COMPOSITION: - Alumina ≥ 99 %
- Free silica < 0,1 %
3 CONTROLLED CHEMICAL COMPONENTS: None
4 GRAIN SHAPE: Angular and massive grain
5 HARDNESS (typical values): 2 100 kg/mm (Knoop hardness)
9 (Mohs hardness)
6 DENSITY: - True with pyknometer
- ≥ 3 940 kg/m
7 GRAIN SIZE DISTRIBUTION:
GRAIN SIZE DISTRIBUTION ISO 565
TEST SIEVES - APERTURE 2 mm 1,40 mm 1 mm
% RESIDUE 0
≤ 20 ≥ 70
TEST SIEVES - APERTURE 850 µm
% REMAINDER ≤ 3
8 METHOD OF DETERMINATION OF GRAIN SIZE DISTRIBUTION: according to ISO 8486-1
(for sampling methods, see Annexes B and C of this standard).
9 SPECIAL INSTRUCTIONS: None.
DESIGNATION: White corundum F 20
Main use:
GRAIN SIZE: 710 µm to 1,70 mm
(for information)
DESCRIPTION: fused aluminium oxide
– Surface preparation
ASPECT:
– Surface reconditioning
MATERIAL: Ground corundum
COLOUR: White
1 ORIGIN: Artificial
2 CHEMICAL COMPOSITION: - Alumina ≥ 99 %
- Free silica < 0,1 %
3 CONTROLLED CHEMICAL COMPONENTS: None
4 GRAIN SHAPE: Angular and massive grain
5 HARDNESS (typical values): 2 100 kg/mm (Knoop hardness)
9 (Mohs hardness)
6 DENSITY: - True with pyknometer
- ≥ 3 940 kg/m
7 GRAIN SIZE DISTRIBUTION:
GRAIN SIZE DISTRIBUTION ISO 565
TEST SIEVES - APERTURE
1,70 mm 1,18 mm 850 µm
% RESIDUE 0
≤ 20 ≥ 70
TEST SIEVES - APERTURE 710 µm
% REMAINDER
≤ 3
8 METHOD OF DETERMINATION OF GRAIN SIZE DISTRIBUTION: according to ISO 8486-1
(for sampling methods, see Annexes B and C of this standard).
9 SPECIAL INSTRUCTIONS: None.
DESIGNATION: White corundum F 22
Main use:
GRAIN SIZE: 600 µm to 1,40 mm
(for information)
DESCRIPTION: fused aluminium oxide
– Surface preparation
ASPECT:
– Surface reconditioning
MATERIAL: Ground corundum
COLOUR: White
1 ORIGIN: Artificial
2 CHEMICAL COMPOSITION: - Alumina ≥ 99 %
- Free silica < 0,1 %
3 CONTROLLED CHEMICAL COMPONENTS: None
4 GRAIN SHAPE: Angular and massive grain
5 HARDNESS (typical values): 2 100 kg/mm (Knoop hardness)
9 (Mohs hardness)
6 DENSITY: - True with pyknometer
- ≥ 3 940 kg/m
7 GRAIN SIZE DISTRIBUTION:
GRAIN SIZE DISTRIBUTION ISO 565
TEST SIEVES - APERTURE
1,40 mm 1 mm 710 µm
% RESIDUE 0
≤ 20 ≥ 70
TEST SIEVES - APERTURE 600 µm
% REMAINDER
≤ 3
8 METHOD OF DETERMINATION OF GRAIN SIZE DISTRIBUTION: according to ISO 8486-1
(for sampling methods, see Annexes B and C of this standard).
9 SPECIAL INSTRUCTIONS: None.
DESIGNATION: White corundum F 24
Main use:
GRAIN SIZE: 500 µm to 1,18 mm
(for information)
DESCRIPTION: fused aluminium oxide
– Surface preparation
ASPECT:
– Surface reconditioning
MATERIAL: Ground corundum
COLOUR: White
1 ORIGIN: Artificial
2 CHEMICAL COMPOSITION: - Alumina ≥ 99 %
- Free silica < 0,1 %
3 CONTROLLED CHEMICAL COMPONENTS: None
4 GRAIN SHAPE: Angular and massive grain
5 HARDNESS (typical values): 2 100 kg/mm (Knoop hardness)
9 (Mohs hardness)
6 DENSITY: - True with pyknometer
- ≥ 3 940 kg/m
7 GRAIN SIZE DISTRIBUTION:
GRAIN SIZE DISTRIBUTION ISO 565
TEST SIEVES - APERTURE 1,18 mm 850 µm 600 µm
% RESIDUE 0
≤ 25 ≥ 65
TEST SIEVES - APERTURE 500 µm
% REMAINDER
≤ 3
8 METHOD OF DETERMINATION OF GRAIN SIZE DISTRIBUTION: according to ISO 8486-1
(for sampling methods, see Annexes B and C of this standard).
9 SPECIAL INSTRUCTIONS: None.
DESIGNATION: White corundum F 30
Main use:
GRAIN SIZE: 430 µm to 1 mm
(for information)
DESCRIPTION: fused aluminium oxide
– Surface preparation
ASPECT:
– Surface reconditioning
MATERIAL: Ground corundum
COLOUR: White
1 ORIGIN: Artificial
2 CHEMICAL COMPOSITION: - Alumina ≥ 99 %
- Free silica < 0,1 %
3 CONTROLLED CHEMICAL COMPONENTS: None
4 GRAIN SHAPE: Angular and massive grain
5 HARDNESS (typical values): 2 100 kg/mm (Knoop hardness)
9 (Mohs hardness)
6 DENSITY: - True with pyknometer
- ≥ 3 940 kg/m
7 GRAIN SIZE DISTRIBUTION:
GRAIN SIZE DISTRIBUTION ISO 565
TEST SIEVES - APERTURE
1 mm 710 µm 500 µm
% RESIDUE 0
≤ 25 ≥ 65
TEST SIEVES - APERTURE 425 µm
% REMAINDER
≤ 3
8 METHOD OF DETERMINATION OF GRAIN SIZE DISTRIBUTION: according to ISO 8486-1
(for sampling methods, see Annexes B and C of this standard).
9 SPECIAL INSTRUCTIONS: None.
DESIGNATION: White corundum F 36
Main use:
GRAIN SIZE: 360 µm to 850 µm
(for information)
DESCRIPTION: fused aluminium oxide
– Surface preparation
ASPECT:
– Surface reconditioning
MATERIAL: Ground corundum
COLOUR: White
1 ORIGIN: Artificial
2 CHEMICAL COMPOSITION: - Alumina ≥ 99 %
- Free silica < 0,1 %
3 CONTROLLED CHEMICAL COMPONENTS: None
4 GRAIN SHAPE: Angular and massive grain
5 HARDNESS (typical values): 2 100 kg/mm (Knoop hardness)
9 (Mohs hardness)
6 DENSITY: - True with pyknometer
- ≥ 3 940 kg/m
7 GRAIN SIZE DISTRIBUTION:
GRAIN SIZE DISTRIBUTION ISO 565 (µm)
TEST SIEVES - APERTURE 850 600 425
% RESIDUE 0
≤ 25 ≥ 65
TEST SIEVES - APERTURE 355
% REMAINDER ≤ 3
8 METHOD OF DETERMINATION OF GRAIN SIZE DISTRIBUTION: according to ISO 8486-1
(for sampling methods, see Annexes B and C of this standard).
9 SPECIAL INSTRUCTIONS: None.
DESIGNATION: White corundum F 40
Main use:
GRAIN SIZE: 300 µm to 710 µm
(for information)
DESCRIPTION: fused aluminium oxide
– Surface preparation
ASPECT:
– Surface reconditioning
MATERIAL: Ground corundum
COLOUR: White
1 ORIGIN: Artificial
2 CHEMICAL COMPOSITION: - Alumina ≥ 99 %
- Free silica < 0,1 %
3 CONTROLLED CHEMICAL COMPONENTS: None
4 GRAIN SHAPE: Angular and massive grain
5 HARDNESS (typical values): 2 100 kg/mm (Knoop hardness)
9 (Mohs hardness)
6 DENSITY: - True with pyknometer
- ≥ 3 940 kg/m
7 GRAIN SIZE DISTRIBUTION:
GRAIN SIZE DISTRIBUTION ISO 565 (µm)
TEST SIEVES - APERTURE 710 500 355
% RESIDUE 0
≤ 30 ≥ 65
TEST SIEVES - APERTURE 300
% REMAINDER
≤ 3
8 METHOD OF DETERMINATION OF GRAIN SIZE DISTRIBUTION: according to ISO 8486-1
(for sampling methods, see Annexes B and C of this standard).
9 SPECIAL INSTRUCTIONS: None.
DESIGNATION: White corundum F 46
Main use:
GRAIN SIZE: 250 µm to 600 µm
(for information)
DESCRIPTION: fused aluminium oxide
– Surface preparation
ASPECT:
– Surface reconditioning
MATERIAL: Ground corundum
COLOUR: White
1 ORIGIN: Artificial
2 CHEMICAL COMPOSITION: - Alumina ≥ 99 %
- Free silica < 0,1 %
3 CONTROLLED CHEMICAL COMPONENTS: None
4 GRAIN SHAPE: Angular and massive grain
5 HARDNESS (typical values): 2 100 kg/mm (Knoop hardness)
9 (Mohs hardness)
6 DENSITY: - True with pyknometer
- ≥ 3 940 kg/m
7 GRAIN SIZE DISTRIBUTION:
GRAIN SIZE DISTRIBUTION ISO 565 (µm)
TEST SIEVES - APERTURE 600 425 300
% RESIDUE 0
≤ 30 ≥ 65
TEST SIEVES - APERTURE 250
% REMAINDER ≤ 3
8 METHOD OF DETERMINATION OF GRAIN SIZE DISTRIBUTION: according to ISO 8486-1
(for sampling methods, see Annexes B and C of this standard).
9 SPECIAL INSTRUCTIONS: None.
DESIGNATION: White corundum F 54
Main use:
GRAIN SIZE: 210 µm to 500 µm
(for information)
DESCRIPTION: fused aluminium oxide
– Surface preparation
ASPECT:
– Surface reconditioning
MATERIAL: Ground corundum
COLOUR: White
1 ORIGIN: Artificial
2 CHEMICAL COMPOSITION: - Alumina ≥ 99 %
- Free silica < 0,1 %
3 CONTROLLED CHEMICAL COMPONENTS: None
4 GRAIN SHAPE: Angular and massive grain
5 HARDNESS (typical values): 2 100 kg/mm (Knoop hardness)
9 (Mohs hardness)
6 DENSITY: - True with pyknometer
- ≥ 3 940 kg/m
7 GRAIN SIZE DISTRIBUTION:
GRAIN SIZE DISTRIBUTION ISO 565 (µm)
TEST SIEVES - APERTURE 500 355 250
% RESIDUE 0
≤ 30 ≥ 65
TEST SIEVES - APERTURE 212
% REMAINDER ≤ 3
8 METHOD OF DETERMINATION OF GRAIN SIZE DISTRIBUTION: according to ISO 8486-1
(for sampling methods, see Annexes B and C of this standard).
9 SPECIAL INSTRUCTIONS: None.
DESIGNATION: White corundum F 60
Main use:
GRAIN SIZE: 180 µm to 430 µm
(for information)
DESCRIPTION: fused aluminium oxide
– Surface preparation
ASPECT:
– Surface reconditioning
MATERIAL: Ground corundum
COLOUR: White
1 ORIGIN: Artificial
2 CHEMICAL COMPOSITION: - Alumina ≥ 99 %
- Free silica < 0,1 %
3 CONTROLLED CHEMICAL COMPONENTS: None
4 GRAIN SHAPE: Angular and massive grain
5 HARDNESS (typical values): 2 100 kg/mm (Knoop hardness)
9 (Mohs hardness)
6 DENSITY: - True with pyknometer
- ≥ 3 940 kg/m
7 GRAIN SIZE DISTRIBUTION:
GRAIN SIZE DISTRIBUTION ISO 565 (µm)
TEST SIEVES - APERTURE 425 300 212
% RESIDUE 0
≤
...