Retanning Agent


DOWELLTAN  ST56  is a copolymer of phenolic sulfonic acid and aromatic hydroxyl sulfone.

Chemical & Physical Data:

Appearance:              Rice white to light yellow powder

Solid Content/%:        ≥93.0

pH(10%):                    2.0~4.0

Charge:                      Anionic


lUsed for soft leather such as floater to obtain a good foaming feel.

lGives leather a very fine grain and soft & rounded handle. After use it, can make dyeing effect more bright and even.

lIt has excellent light resistance and can be used for the production of light colored and white leather.


lIt can be used in the production of light leather or white leather. Suggestion dosage is 4-6% (based on the shaved weight of blue).

lFor reptile leather, the contrast of black and white pattern is particularly obvious, and has excellent dyeing performance.

lIt contains trace amounts of formaldehyde, please decide the dosage according to the formaldehyde limit requirements of leather.


 20KG kraft paper bag


 1 year storage in sealed original package at 5-35℃.Re-seal the package after each use.Store in a cool and dry environment, moistureproof and bask in.Once the package is opened, it is advisable to use up the product in the package as soon as possible.Direct contact may irritate skin. Flush with running water when in contact. Non-dangerous chemicals.