TANMA® Powder for leather tanning applications

TANMA® Powder is a high purity hard-burned, free-flowing, white magnesium oxide powder, especially designed for use as a basifying agent.

TANMA® Powder is the trade name of the tanning magnesia grade with a leading position in the international market.

TANMA® Powder was developed by Grecian Magnesite SA in close collaboration with the leather tanning industry and its research supporting institution to meet the most demanding requirements of this application.

Main Uses & Advantages

TANMA® Powder has a quality appearance, being a white, gritless, free-flowing powder. It is produced by selection of special raw materials and controlled sintering and sizing processes to achieve a balanced microstructure, reactivity and grain size, with low free lime, iron and manganese levels. It has a low content of silica, which is finely dispersed and non-abrasive.

TANMA® Powder is the ideal basifier for chrome tannage, effecting a gradual, gentle rise in the pH without overshoots, ensuring uniform chrome stabilization and complete dissolution after 6-8 h without risking staining or spotting of the pelt.

Typically added at 0,3% to 0,5% on limed hide weight, it ensures:

  • Reliable performance without pH initial peaks, leading to a uniform chrome distribution throughout the leather and a smoother, finer grain.
  • Reduced labor/handling costs by eliminating the need for repeated additions.
  • No risk of abrasion to the pelt and consistent reliable results.
  • Great reduction of the risk of green stains caused by local precipitation of chrome.
  • Production of wet blue leather with a pale colour, suitable for the production of white and all dye shades.
  • A higher exhaustion of chrome leading to lower offers of chrome, with consequent cost savings and effluent improvement.

Loading adjustments may be required to achieve the correct balance depending on the pH value during pickling and the quantity of chrome used.


TANMA® Powder - 20years (2003 - 2023)

Celebrating 20 remarkable years, spanning in more than 20 countries in all five continents and more than 120 thousand metric tons sold! 

Experience unparalleled quality with our leading leather tanning solution, TANMA® Powder. Proudly brought to you by Grecian Magnesite. 

Here's to 20 more years of excellence! 

Packaging & Storage

TANMA Powder is available: In big bags of 1.000kg with inner nylon and bottom spout. In 25 kg paper bags on pallets wrapped in shrink film.

TANMA Powder has a shelf-life of 9 months provided that the product is stored in a clean dry storage area under proper conditions. Magnesium oxide absorbs moisture and forms lumps. Always re-seal partly used bags.

Main Properties
MgO Content (typ):95,0%
TANMA Powder for the leather Tanning Industry by Grecian Magnesite S.A.
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Email: info@grecianmagnesite.gr

Recommended Applications

Leather Tanning

In leather production, it is imperative to stabilize the collagen fibers of the animal hides so that they are no longer subject to biodegradation. This is accomplished by the tanning of the leather with the use of stabilization/preservation agents. Chrome-based salts are the most common agents used in the so-called mineral tanning (chromium, zirconium or aluminium).

Magnesite stories
A leather tanning

& less costly:
a leather tanning story

In Brazil, Italy, the USA and other leather producing countries around the globe, the use of dead burned magnesite as a collagen stabilizing agent has been well known for almost two centuries. There are very few suitable MgO-based products worldwide that avoid stains and secure longevity of the valuable leather. Enter TANMA!


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