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TECHNICAL  PROFILE

INDEX:

1.0       EXECUTIVE SUMMARY

2.0       TECHNICAL SPECIFICATIONS

  • ABRASIVE BLASTING DATA
  • RECYCLING
  • BLASTING NOZZLE TYPES

1.1  Product Approval Specifications:

The mineral slag abrasive blasting grit mentioned hereunder has been tested and approved according to the following national and international standards:

SIS  

NACE

ASTM

SSPC 

SSPPC

AAC

(SECMET)

(SECMET)

(SECMET)  

(SECMET) 

(CSIR)

(CSIR)

Swedish Standard

National Association of Corrosion Engineers

American Society for Testing Materials

Steel Structures Painting Council

Saldanha Steel, Specification for Painting & Corrosion Protection

Anglo American Corporation Specification for Corrosion Protection of Steelwork with Coatings

 

1.2  Product Description:

Afrigrit’s superior, slag blasting, abrasive grit: AGT 1, 2 & 3  has been the result of extensive research, intensive investigation and numerous evaluations and analyses conducted by accredited research laboratories.

The grit is a grey/brown angular shaped solid, particulate, which is inert, odorless and is incapable of supporting combustion.

The grit has been graded into the following three sizes (25-45 micron) Superfine AGT 1, (50-85 micron) Fine AGT 2 and (100 =) Medium AGT 3, which suit most abrasive blasting operations.

1.3  Product Scope:

AGT 1,2 & 3 has proved to be a superior product for the following      applications:
                                               
The removal of:                    

  • Mill scale
  • rust
  • old paint
  • tar 
  • epoxy

The cleaning of:

  • metal
  • wood
  • tin
  • road surfaces

            
                                   
Etching into:                                     

  • glass
  • plastics
  • metals
  • ceramics
  • granite

 

1.4  Product Benefits

The main advantages of AGT 1,2 & 3 are the following:

*         Complies with Health & Safety requirements
*         Environment friendly  (air and ground contamination)
*         Superior finish
*         Excellent break down rate
*         Tremendous cutting rate due to sharp angular configuration
*         Create superb coating and bonding surface
*         Its performance rate per m2 exceeds expectations
*         The higher than normal density of 3470 kg/m3 and hardness of more than 6 on the Moh’s scale enhances its
            abrasive qualities immensely.
*         Competitively low prices
*         Irregular surface profile of blasted material offers a high degree of grip for permanent coating bond.
*         Product relatively dust free < 13% liberation
*         Weber Reilly Test result: less than 100mg\m²

1.5 Approvals:

*         SecMet Metallurgical & Corrosion Consultants (Sasol)
            *         Mpumalanga Department of Labour
            *         Jotun Paints SA
            *         Sigma Coatings
            *         Mozal
            *         Conforms to SABS 064-1979 FIRST REVISION
            *         Anglo Gold
            *         bhp Billiton
            *         Iscor

                

1.6 Accredited Testing Authorities used:

*         SecMet Metallurgical & Corrosion Consultants
*         Gencor Laboratories
*         Columbus Stainless Steel (Group Occupational Hygiene Department) Approve Inspection Authority for the
            Monitoring of Physical & Chemical Stress factors.
*         CSIR
*         MINTEK Group Chemistry
           

2.0  TECHNICAL SPECIFICATIONS

2.1  Profile & Size (SECMET tested):

 

AGT 1

AGT 2

AGT 3


Profile @ 6 bar nozzle pressure


25-45 micron


50-85 micron


100+ micron

                             

2.2  Specific Gravity (SECMET tested):

Actual

Specification No1 ASTM C 128-88

3470 kg/m3

Minimum: 2500 kg/m3

 

2.3 Hardness (SECMET tested):

Actual

Specification for mineral slag abrasives

³ 6

Minimum: 6

  

2.4  Weight Loss on Ignition (SECMET tested):

Actual

Specification for mineral slag abrasives

0.68 %

Minimum: -1.0 % Maximum: 5.0 %

   

2.5  Water-soluble contaminants (SECMET tested):

Parameter

Actual

Specification for mineral
slag abrasives

PH

9.7

Not to be below 6.2

Conductivity mS/cm

70.8

< 100

Sulphate mg/l

15

 

Nitrate mg/l

2.1

 

Chloride mg/l

1.73 (0.00173%)

< 0.03 % by mass

 

 

 

 

2.6 Oil content (CSIR) & (SECMET) tested:

                        Specifications: abrasive shall show no presence of oil.

AGT 1

 

AGT 2

 

AGT 3

 

Nil

Nil

Nil

 

2.7  Moisture content (CSIR) & (SECMET) tested:

Actual

Specification ASTM C-566

0.22 %

Maximum: 0.5 % by weight

 

3.0  ABRASIVE BLASTING DATA  

3.1  Blast Cleaning – Preparation Grades (International Standard):


           


Grade – BS 7079
SS 05 59 00

Description

When viewed with the naked eye:

SA 2

Thorough blast cleaning:
Commercial finish
65% clean

The surface shall be free from visible oil, dirt & grease, & from poorly adhering mill scale, rust, paint coatings & foreign matter. Any residual contamination should be firmly adhering.

SA 2 ½

Very thorough blast cleaning:
Near white metal
85% clean

The surface shall be free from visible oil, dirt & grease, & from poorly adhering mill scale, rust, paint coatings & foreign matter. The metal has a grayish colour.
Any traces of contamination shall be visible only as slight stains in the form of spots and or stripes.

SA 3

Blast cleaning to pure metal:
White metal
100 % clean

The surface shall be free from visible oil, dirt & grease, & from poorly adhering mill scale, rust, paint coatings & foreign matter.
The blasted surface must have a uniform metallic colour.

3.2  Blasting Grades:

Following is a table giving a clear indication of the comparative blasting grades applicable to national and international standards:

 

Blasting Grade Common Standards Comparison

SSPC
Steel Structures Painting Council

BS 7079
British Standards
SS 05 59 00
Swedish Standards

BS 4232

NACE
National Association of Corrosion Engineers

White metal (SP5)

Sa 3

1st Quality

Grade 1

Near white metal (SP10)

Sa 2.5

2nd Quality

Grade 2

Commercial finish (SP6)

Sa 2

3rd Quality

Grade 3

3.3  Packaging

Grit can be supplied in the following manner;

  • Loose
  • 30kg bags
  • Bulk bags
  • 30Kg bags packed in bulk bags

 

  • RUST GRADES:

A

Surface mostly covered with adherent mill scale, with little or no rust

B

Mill scale has begun to flake, rust has started to form

C

Mill scale has rusted away or can be scraped off easily and slight pitting has taken place

D

Mill scale has rusted away and general pitting can be seen with naked eye.

 

  •     COMPRESSED AIR TECHNOLOGY

 

*   “Energy is Money” can definitely be applied to compressed air as being one of the most expensive forms of energy. Regardless of the source providing power to the compressor it will mean that cost is involved. Therefore it makes good sense to manage your energy (compressed air) wisely. Research has proved that a 3mm hole in an air hose will easily add up to R40 000-00 a year lost in cost. Consider the following:
*   Correct specified perforation free hoses and efficient seals;
*   Friction loss due to lengthy hoses;
*   The correct Venturi nozzle in relation to the compressor capacity;
*   Maintaining a constant nozzle pressure of 700Kpa (considered the ideal pressure);
*   A qualified blasting operator;
*   An efficient blasting medium;
*   Regular maintenance or servicing of equipment e.g. valves; seals, hoses etc.

  •    RECYCLING

 

Is recycling a cost efficient activity? Consider the following:
*   Time, effort and labour spent on the reclamation of spent grit;
*   Possible contamination of blasted substrate due to impurities in the spent abrasive;
*   Loss in production;
*   Breakdown in particle size resulting in an insufficient blast profile;
*   Excessive dust emission;
*   Possibility of blockages to pot and nozzle;
*   Conductivity levels;
*   The possible delaminating of protective coating system.

  • BLASTING NOZZLE TYPES:

 

Type

Velocity of abrasive leaving nozzle @ 7 Bar

Blast pattern concentration

Straight bore

350km/hr

Concentrates most of abrasive at center of blast pattern

Venturi nozzle

720 km/hr

Uniform concentration of abrasive in blast pattern

 

Nozzle blasting pressures:

*         Increased nozzle pressure:

The optimal pressure measured at the blasting nozzle is 700kPa or 7 bar.
An increase of pressure above 7 bar does not increase the velocity of the abrasive to any economical levels.
For safety reasons it is not good to increase pressure above 7 bar.
 
*      Decreased nozzle pressure:

7 Bar is the ideal nozzle pressure, as a rule of thumb 1 % loss in pressure is equal to 1.5% loss in efficiency.

Nozzle pressure

% Pressure loss

%  Efficiency

%  Efficiency
Lost

7.0 bar(100psi)

0 %

100 %

0 %

6.5 bar(+-95psi)

7 %

89 %

11 %

6.0 bar(+-85psi)

14 %

79 %

21 %

5.5 bar(80psi)

21 %

68 %

32 %

5.0 bar(+-73psi)

29 %

56 %

46 %

ALL ANALYTICAL DOCUMENTATION AVAILABLE ON REQUEST.

 

MATERIAL SAFETY DATA

All information in this MSDS is given in good faith and is accurate according to test results by accredited authorities. This MSDS is subject to revision when additional information comes to light.

1 PRODUCT IDENTIFICATION
Trade Name: Chromium slag based grit.
Chemical Family:  Ferrochrome

2 COMPOSITION AND INGREDIENT INFORMATION
Hazardous components: Fine ferrochrome slag.
Common chemical name or generic name: Ferrochromium
Hazchem Code: Not applicable
UN / URG Number: Not applicable
CHEMICAL COMPOSITION
Calcium Oxide 2% Titanium Dioxide 1%
Magnesium Oxide 20% Iron Oxide 8%
Aluminium Oxide 26% Chrome 3 oxide 12%
Silicon Dioxide 32%

 

Date of origin Originator Revised by   Date of revision     Revision no  Name of doc.
10 Feb. 1997 Pat Pick R. Ellis 02-Mar-05   8   M.S.D.S.

 

3 HAZARDS IDENTIFICATION
Specific Hazards: None. Health effects:          
Flammability: None. Eyes: Same as any other foreign object or dust.
Chemical Hazard: None. Skin: Same as any other foreign object or dust.
Biological hazard: None. Ingestion: No known hazards.  
Reproductive Hazard: None. Inhalation: Same as for nuisance dust.  
Carcinogenicity: Not applicable   
Mutagenicity: No known hazards.    

4 FIRST AID MEASURES
Product in eye: Wash with clean water until dust or particle is removed. If object could
not be removed by this method seek medical attention.
Product on skin: Dust off or wash with water.
Product ingested: No need to administer any remedy although water will help rinse 
stomach.
Product inhaled: If person is overcome by dust cloud, introduction of clean fresh air is
advised.

5 FIRE FIGHTING MEASURES
Extinguishing media: The substance is not flammable and inert to all 
fire fighting media.
Special Hazards: Not advisable for areas with a higher temperature than 1500 ºc.
Protective clothing: Only necessary in the blasting application.

6 ACCIDENTAL RELEASE MEASURES
Personal precautions: None
Environmental precautions: Leaching may occur when in contact with organic compositions
over a long period. Mix with a lime solution.
Suggested method of cleanup: Remove from organic material as soon as possible.
Gather spilled material with brooms, spades, scoops etc.

7 HANDLING AND STORAGE
Handling:

No precautions needed, can be handled safely when loose or bagged.

Storage Precautions:

There is no unsafe storage for chrome based slag when suitable storage is being provided. (e.g. dry, undercover storage.) However, keep in mind that contact with organic material and acid rain may cause leaching over a period of time.

 

Date of origin Originator Revised by   Date of revision   Revision no  Name of doc.
10 Feb. 1997 Pat Pick R. Ellis 02-Mar-05 8   M.S.D.S.

8 EXPOSURE CONTROL AND PERSONAL PROTECTION
Occupational Exposure Limits (OEL): Total in-halable dust 0.5mg/m³
Engineering control measures: None
Personal protection during working application:
  a Respiratory:  Suitable dust masks of same nature as for nuisance dust.
  b Hand: Suitable dust masks of same nature as for nuisance dust.
  c Eye: Safety glasses or shield.
  d Skin: Overall or other suitable clothing covering the whole body.
  e Feet: Safety shoes or boots.
  f Other protection: The end user for sandblasting operations must have a writtenSafe Working Procedure according to this MSDS.
 
  g Risk assessment: The end user for sandblasting operations must have a risk assessment done by a competent person before commencing with the blasting operation.

 

9 PHYSICAL AND CHEMICAL PROPERTIES:
Appearance: Dark Grey in colour, particle sizes ranging between 0.5mm-2.8mm.
Odour: Slight dusty odour.
pH: 7.9
Boiling Point: N/A
Melting Point: 1600 - 1700 ºC
Flash Point: N/A
Flammability: N/A
Spontaneous combustion: N/A
Explosive properties: Same as for any dust cloud mixed at the critical mixture with oxygen in closed confinement.  
Oxidizing properties: N/A
Vapour pressure: N/A
Density: 3470Kg/m³
Solubility -water: N/A
Solubility -coefficient: N/A
Neurotoxicity: None
Conductivity: <100 uS/cm
Tested on 8 July 2003 by Secmet (Metallurgical and Corrosion Consultants ) as follows: 
Conductivity: 68
uS/cm
Sulfate: 4.9 (mg/L)
Nitrate: 0.3 (mg/L)

All within the OEL
Chloride: 19 (mg/L)
Silica: 0.4 (mg/L)

 

Date of origin Originator Revised by   Date of revision   Revision no  Name of doc.
10 Feb. 1997 Pat Pick R. Ellis 02-Mar-05 8   M.S.D.S.

10 STABILITY AND REACTIVITY
Conditions to avoid:
a Storage in contact with organic material over a long period of time.
b Highly acidic conditions.
c Dumping where leaching may occur.
f Protect from acid rain with suitable cover, e.g..  a tarpaulin.
Incompatible materials:
a Inorganic material.
b Acids.
Hazardous decomposition products:                     As listed above.

11 TOXICOLOGICAL INFORMATION
Acute toxicity: Dust may cause irritation to nose, throat and lungs.
Skin and eye contact: Redness and soreness of the skin and tearing of eye tissue. 
Chronic toxicity: Ulceration of the Central Nasal Septum of the nose, chronic dermatitis, over a prolonged period.
Carcinogenicity: Level of Cr IV is non-detectable. 
Mutagenicity   N/A.
Reproductive hazards: None known.

12 ECOLOGICAL INFORMATION
Aquatic toxicity: (fish:) None.
Aquatic toxicity (daphnia:) None known.
Aquatic toxicity (algae:) None known.
Biodegradability: Slow.
Bio-accumulation: High.
Mobility: None
German wgk:

 

13 DISPOSAL CONSIDERATIONS
Disposal methods:
a              Bag and store used grit separate from unused grit to prevent contamination.
b            Store under cover or under a tarpaulin.
c              Dispose of at suitable site. (Spent abrasives may accumulate hazardous substances from the blasted surface, re-use not recommended due to possible conductivity risk.)
d              When disposing of spent grit, consideration must be paid to the substance blast cleaned as it may contain hazardous material.
e              Do not dispose of with organic material and if unavoidable a lime solution should be added. 
Disposal of packaging:
a              Can be recycled.

14 TRANSPORT INFORMATION

International regulations:

Ferrochromium based grit used as a reference material may be shipped by road, rail or air freight. It is transportable in 30Kg bags, 1.2 ton bulk bags or in containers. No UN / ERG number required (see Chapter 8 of National Road Traffic Act).

15 REGULATORY INFORMATION
National Legislation
Elements contained in this product has been listed in the Hazardous Chemical Substances
Regulations for the Occupational Exposure Limit. Refer to Section 24 of the Constitution's 

Legislation and Standards pertaining to Health & Environment.

The Department of Water Affairs and Forestry's Waste Management Series Volume 1, Second Edition 1998 states: "The aim in hazardous waste disposal, should not be to 'ban' chemicals or waste streams from accepting such streams in the environment. It should be to exert subtle and reasonable controls to make disposal acceptable. Acceptable would then imply that disposal should conform to acceptable risk."

 

16 OTHER INFORMATION

Approvals:

Occupational exposure assessment has been done on the final product (actual blasting process). No detrimental health effects were identified. An occupational hygiene risk assessment was done at two of the end users substantiating this. Comprehensive chemical analysis of the product and air samples were done by SABS approved laboratories and an approved inspection authority.

 
This MSDS conforms with General Administrative Regulations of 6 September 1996 
(ISO 11014 / ANSIZ400.1.1996) and South African Committee for Certified Reference Materials.

 

PRODUCT DATA

TECHNICAL SPECS

                            
 
Generic name: Ferrochrome slag AGT 1 AGT 2  AGT 3
Hardness (Moh)     >6            
Ph value         7.90 * Blasting rate (m² / min) 1.15min 2.15 min 3.58min
Conductivity (uS/cm)       70.80 Cleanliness       SA 3 SA 2.5 SA 2.5
Sulphate (mg/l)     15 Profile (micron)     25-45 50-85 100+
Nitrate (mg/l)       2.1
Chloride (mg/l)       1.73 * Test performed on Bendox plate
Oil content       Nil * Blasting test performed with nozzle pressure of 6.2 Bar
Moisture content     0.20% * Complete blasting test available on request
Specific gravity (Kg/m³)   3470
Weight loss on ignition   0.68% The product contains no free silica
                                     

PACKAGING

                        
   
AGT 1,2 & 3 are available in:  30Kg bags  
  1 ton bulk bags  
  30Kg bags packed in bulk bags  
              Loose            

SUITABLE APPLICATIONS

                          
   
AGT is suitable for:  * Removal of mill scale * Cleaning tin  
  * Removal of rust * Cleaning road surfaces  
  * Removal of old paint coatings * Etching into glass  
  * Removal of tar * Etching into plastics  
  * Removal of epoxy * Etching into metals  
  * Cleaning metal * Etching into ceramics  
          * Cleaning wood           * Etching into granite  
ACCREDITED TESTING AUTHORITIES USED    
   
SecMet Metallurgical & Corrosion Consultants  
(SASOL)  
Gencor Laboratories  
Columbus Stainless Steel  
Regen Waters  
CSIR                    
AGT conforms to National and International Health and Safety regulations, is non-toxic and inert
AGT can be reused but is not recommended due to quality and labour intensive costs
A study report is available on request
NOTE: Cognisance should be taken when disposing spent grit on a dump site as it may becontaminated with hazardous substances
 
      ORIGINATOR DATE REVISED REVISED BY DOCUMENT APPROVAL REV. NR.
27-Jun-02 M. DOUGLAS 30-Sep-09 R. ELLIS PRODUCT DATA SHEET E. PICK 3