Blast Furnace Slag


  • From 1990 Peakward began its operation with exporting Chinese and Indonesian bagged Cement to Bangladesh where it occupied 30% market share of Cement.
  • Peakward was a listed Cement supplier for UNICEF and supplied Cement to UNICEF projects in Bangladesh and Vietnam.
  • Peakward was the first company to supply Indonesian bulk and bagged Cement to Egypt in 1998/1999.
  • Peakward delivered bulk Cement to 4M floating Terminal of Mr. Mansour in Alexandria and supplied bulk cement to HC Trading for floating terminal in Damietta.

For more information and quality specifications,

please feel free to contact us at:

Japan, China, Vietnam, Korea, India, Indonesia etc. or Seller’s/Buyer’s Choice.


Granulated Blast Furnace Slag has a glassy structure and can be used as a fine aggregate or binder. GBFS is commonly used in the manufacture of blended cements and the ready-mix concrete plant where it is inter-ground or blended separately with cement usually at a 20% – 40% proportion. Unblended GBFS is can be used in road pavements and building products.


Packing can be arranged based on:
1. Bulk in vessels (GBFS)
2. In 50kg bags in 1-2MT Sling Bags or Buyers option
3. In Bulk (Big Bags) of 1-2MT Sling Bags

All shipment compartments will be sealed and waterproofed on board vessels.



Blast-furnace slag, a by-product of iron and steel industry, is mixed with cement for use as a cement alternative additives. It is an eco-friendly product, which enables reduced energy use and CO2 emissions in its production process by around 40% as compared to producing concrete from cement only, in addition to saving natural resources such as cement raw materials and limestone. Iron and steel manufacturers produce high-quality iron and steel with blast furnaces and a certain volume of blast-furnace slag as by product is generated in the process. BFS is used to make durable concrete structures in combination with ordinary Portland cement and/or other pozzolanic materials.

Over 15 years ago, Peakward started to export blast-furnace slag in international construction market. We have now expanded our operation to more than ten countries. Our slag is used mainly for producing Slag cement and ready-mix concrete. We can supply GGBFS & GBFS from various countries including Japan, China, Vietnam, Korea, India etc. The BF Slag supplied by us have almost 90%-96% Glass content and soft to grind. GBFS is supplied in bulk while GGBFS is supplied both in big bags and in bulk .


Our recent Shipment from China:

Vessel Name: MV Theometor
Total Cargo: 54,368 MT
Shipment : From China to Bangladesh
Shipment Date: July 23, 2016
Specification/Test Report: As following

Test report of China Origin GBF Slag:

Test report of Indonesia Origin GBF Slag:

Test report of Vietnam Origin GBF Slag:

Standard Specification:

Granulated Blast Furnace Slag

Calcium Oxide CaO % 38 – 45
Silicon Dioxide SiO2 % 30 – 36
Aluminium Oxide Al2O3 % 12 – 18
Magnesium Oxide MgO % 4 – 9
Manganese Oxide MnO % 1.5 max
Ferrous Oxide FeO % 1.5 max
Titanium Oxide TiO2 % 2.0 max
Sulfur S % 1.3 max
Basicity ï¼CaO+MgO+Al2O3)/SiO‚ % 1.75 min
Glass Content % 95 min
Moisture % 10 max
Size -5mm % 95 min

Typical Test Report

Granulated Blast Furnace Slag

Chemical Analysis

Calcium Oxide CaO % 39.5
Silicon Dioxide SiO2 % 34.7
Aluminium Oxide Al2O3 % 12.35
Magnesium Oxide MgO % 9.04
Manganese Oxide MnO % 0.29
Loss On Ignition LOI % 0.26
Titanium Oxide TiO2 % 0.7
Chloride Cl % 0.006
Sulfur S % 0.63
Alkalies Na2O %
Basicity (CaO+MgO+Al2O3)/SiO₂ % 1.75
Glass Content % 90
Moisture % 7
Size -10mm % 99.3