50g / 100g / 250g / 500g / 1000g / 5KG / 10KG / 25KG
Dye Pigment

(SELECT WEIGHT & COLOUR USING DROP DOWN MENU ABOVE)

*FAST & FREE UK DELIVERY ON ANY WEIGHT SELECTED*
50g - 1000g SENT ROYAL MAIL 2ND CLASS
5kg - 25kg SENT PARCELFORCE 24



*PLEASE NOTE* THIS IRON OXIDE IS THE MORE EXPENSIVE ''SYNTHETIC'' IRON OXIDE AND NOT THE CHEAPER ''NATURAL'' IRON OXIDE LIKE OTHERS BEING SOLD HERE ON EBAY.


Read Below About The Benefits Of Using SYNTHETIC Iron Oxide.
 

Natural Iron Oxide or Synthetic Iron Oxide?

Natural Iron Oxides contain contaminates,
these contaminates reduce their tinting strength in comparison to their Synthetic counterparts as it is much easier to control trace levels of heavy metals in a Synthetically produced Iron Oxide than it is in a Naturally produced Iron Oxide.

Natural Iron Oxides have lower tinting strength per unit weight than Synthetic Iron Oxides, (you will USE LESS with Synthetic Iron Oxide compared to Natural Iron Oxide).

Synthetic Iron Oxides are used where colour consistency is important.

Our Synthetic Black Iron Oxide is a very dark black colour unlike other Black Iron Oxide which tends to have a brownish undertone.

Synthetic Red & Yellow Iron Oxides are brighter than Natural Red & Yellow Iron Oxides.



Uses

The leading uses of our Synthetic Iron Oxides are in;

Construction Materials such as in Concrete/Cement based Building Products, Masonary, Asphalt, Render, Mortar, Grout, Bricks, Paving Blocks, Paving Slabs, Roofing Tiles, Wall Tiles, Floor Tiles, Chequered Tiles, Designer Tiles, Stamped Concrete etc.



Our Synthetic Iron Oxides are;
Non-Toxic, Odourless, resist colour change due to exposure to sunlight (UV Stable), Weather Resistant, Non-Fading, Good Dispersibility, Alkali Stable, with good chemical resistance, Colour Stability in applications subject to aggressive environments including Paving Blocks, Paving Slabs, Roof Tiles etc.



Help & Mixing Ratio For Mixing With Cement

Colouring Of Cement
When concrete is coloured, only the cement component is bound to the pigment. The colour of the other components simply act as diluents in the mixture. Because the particle size of synthetic iron oxides is much smaller than that of cement, the colour saturation is reached quickly and depending on the quality of pigment used.

8 to 10 parts colour to 100 parts of cement by WEIGHT* will result in maximum colouration in most cases, the practical limit is more 5 - 8 parts colour.
(50grams - 80grams of coloured pigment dye to every kilogram of powdered cement)



Effect of Grey Cement on Final Colour

Technically the grey colour of the cement can be equated to a weak black pigment which when added to the colour of the pigment used, will produce a new blend.

It follows that if the colour of the cement changes, then the resulting colour of the final blend will be different.


White cement will give best results for lighter colours.

Grey cement will give best results for darker colours.

Limestone will lighten the colour of the mix.

Lighter tone sand will give best results.

The colour of the aggregates, sand and stones will have its own effects, although to a much lesser extent.



Mixing Cycle For Coloured Concrete

When cement, water and iron oxide pigment are present together, water is preferentially absorbed by the cement leaving the pigment in a semi dry stage. This state encourages the clumping together of the pigment particles forming dry balls. This condition of "BALLING" will not breakup totally during the short mixing cycle of the concrete. Large balling creates defects in the product but tiny balling, although imperceptible to the eye, do decrease the overall effectiveness of the pigment. Balling can be easily avoided by using the proper cycle in introducing the pigment into the concrete mix.

The principle of a good concrete mixing cycle is the total spreading of each interacting component before the next one is added. When pigment is introduced into the mix, regardless of where in the cycle it is added, it should be allowed to mix uniformly with the present components before the next step begins. Once spread uniformly, the particles will not clump being forced apart by the other components in the mixer. It is of interest to note here that the cement may also clump together if it is not uniformly spread before water is added.

Based on the above principle, the following cycle emerges as the most efficient way to achieve desirable and optimum results.


Preferred cycle:

  • First the aggregate (stone and sand) are introduced into the mixer and given a short mix.
  • Next the pigment colour is introduced and mixed. This step should be as long as needed to uniformly spread the colour and insure that there are no clumps present. The stone and sand act as a grinding medium and further help in the breakup.
  • Once the colour is properly spread, the cement may be added and mixed. Again insure that it is thoroughly spread before going to the next step.
  • Finally water is then introduced and adjusted to the proper level for the mix.