Микросилика

Elkem Microsilica®
concrete
Grade 920 for construction
c2-01 Product

Elkem Microsilica® Grade 920 is dry silica fume available in two main forms:

  • Undensified — 920 U, with a typical bulk density of 200 -350 kg/m3
  • Densified — 920 D, with a typical bulk density of 500 -700 kg/m3

The products are supplied in a range of packaging:

  • 25 kg paper bags
  • Big bags in a variety of designs and sizes depending on product and production plant.
  • Bulk in road tanker

Special packaging can be supplied on request.

Elkem Materials is certified according to ISO 9001.

The chemical composition and physical properties are regularly tested in accordance with international standards.

Conformance to Standards

Elkem Microsilica® Grade 920 conforms to the mandatory requirements of the relevant standards from:

  • American Society for Testing and Materials
  • European Committee for Standardisation
  • Canadian Standards  j Association
Mandatory chemical and physical requirements ASTM С1240 — 03 prEN 13263 САN/СSА23.5 — 98

 

Spec. Frequency Spec. Frequency Spec. Frequency
SiO2 > 85,0 400 MT > 85 weekly > 85 500 MT
SO3     < 2,0 weekly < 1,0 1000 MT
CI (%)     < 0,3 weekly    
Free CaO (%)     < 1,0 weekly    
Free Si (%)     < 0,4 monthly    
Alkalies (as equivalent Na2O, %) Report 400 MT        
Moistur (%) < 3,0 400 MT        
Loss on lgnition, LOI (%) < 6,0 400 MT <4,0 weekly <6,0 500 MT
Specific surface (BET- m2/gram)) > 15 3200 MT/3 months > 15 & <35 monthly    
Bulk density (kg/m3) — undensified Report 400 MT        
Pozz. Activity Index (%) — 7 days accelerated curing > 105 $3200 MT/3 months        
Pozz. Activity Index (%) — 28 days normal curing     > 100 monthly    
Retained on 45 micron sieve (%) < 10 400 MT     < 10 100 MT
Variation from avg. retained on 45 micron (%-points) < 5 avg. of last 10 tests        
Density (kg/m3) Report 400 MT        
Autoclave expansion or contraction (%)         < 0,2 1000 MT
Foaming         No foam 1000 MT

The information given on this datasheet is accurate to the best knowledge of Elkem Materials. The information is offered without guarantee, and Elkem Materials accepts no liability for any direct or indirect damage from its use. The information is subject to change without notice. For latest update or further information or assistance, please contact your local representative, the Internet address or the e-mail address given on this datasheet.