Emsac® 500E slurry for concrete

Emsac® 500E is an aqueous suspension of Elkem Microsilica®. In use, Elkem Microsilica® improves the performance of concrete and mortar formulations.  It acts physically to optimise particle packing of the concrete or mortar mixture and chemically as a highly reactive pozzolan.


Suitable for all concrete and mortar applications where the benefits of silica fume are required:

  • Higher compressive strength
  • Increased durability – Longer service life for structures
  • Enhanced rheology – Control of mixture segregation & bleed 

Emsac® 500E is supplied as an aqueous suspension (slurry) with a solids content of 50% by mass.  The product is easy to handle and pump.  Batch Emsac® 500E into the concrete mixer and mix thoroughly with the other mixture ingredients, adopting a procedure that ensures full dispersion of the product.  Dosage varies depending on application. Contact Elkem for information and advice.


Available in a range of packaging options, including:

  • 200 litre drums
  • 1m3 containers
  • Bulk road tanker

Please contact our representative for more details.

Storage requirements

Emsac® 500E is a stable product.  However, to prevent the natural process of segregation, the product should be regularly agitated to remain homogeneous.  Emsac® 500E should not be allowed to freeze as this renders the product unfit for use. 

Quality Assurance & Quality control

Elkem Silicon Materials’ Management System for development, processing and supply of Elkem Microsilica® is certified to ISO 9001.  The chemical composition and physical properties of Emsac® 500E are regularly tested in accordance with requirements set forth in EN 13263-1

  1. Chemical and physical properties

Emsac® 500E  is certified to EN 13263, Silica fume for concrete

SiO2 Minimum 85.0 %
SO3 Maximum 2.0 %
CI Maximum 0.3 %
Free CaO Maximum 1.0 %
Free Si Maximum 0.4 %
Loss on Ignition Maximum 4.0 %
Specific Surface Area Minimum 15.0 m2/g, Maximum 35.0 m2/g
Pozzolanic Activity Index, 28 days Minimum 100 %
Dry Mass Content 50 % ± 2 %

Test methods are available on request.
Typical bulk density of Emsac® 500E is approximately 1400 kg/m3.