Strong research and development and production capacity in textile auxiliaries, polyurethane waterproofing additives and other materials.

Pretreatment Agents
Heat Stable Desizing Agent PRE-DHK189

Heat Stable Desizing Agent PRE-DHK189

Product Details


DHK189 Heat Stable Desizing Agent





Enzyme for high temperature desizing of textile materials



is suitable for desizing at temperatures of 60 - 100° C

is very fast acting at high temperatures

is suitable for the removal of sizes on the basis of potato starch, corn starch, manioc, carboxylmethyl cellulose

– very low loss of activity when heated with life steam



Chemical Characteristic



Bacterial amylase


Technical Data


Appearance : brown liquid

Density : approx. 1.1 g/ml

pH-value : 5.5 - 6.5

Dissolving procedure: dilute with water

Shelf life : 6 months in closed original containers

at temperatures below 25° C





DHK 189 is used to remove starch and starch-containing sizes from textile material.

The high temperature stability of the product permits desizing temperatures of 60 - 100° C. Starch depolymerisation into small degradation products easily removable by scouring occurs in 1 - 2 min. Continuous procedures such as pad-steam procedures, therefore, are possible.

For extremely high speeds steam temperatures up to 115° C may be used to extremely fast heat the textile material which has been padded with the enzyme solution.

When using DHK 189  the following parameters should be observed :

Temperature :Optimum desizing 60 - 90 °C


pH-value :

The best activity and stability is at pH 6 - 8. The stability does not depend on the presence of water hardness or salt.


Wetting agents :

Most non-ionic products such as

DHK 150, DHK 117 or

DHK 120 are suitable.

Heavy metal ions :

Act as enzyme poison and should be sequestered.

Setting of the desizing bath :

Heat water up to 60 - 90 °C, add and dissolve wetting agent, control pH and adjust with soda ash or acetic acid if required, add

DHK 189 by stirring.

If it is necessary to store the desizing bath for several hours, the temperature should be kept at approx. 20 °C.

Continuous desizing :

The fabric is padded with2 ml/l DHK 189 2 – 5 ml DHK 150

or  DHK 114 pick-up approx. 100 %, age 2 min at 100 °C, afterwards scour thoroughly with hot water, if necessary add detergent and caustic soda to speed up the washing process.

Desizing on the jig

Run the dry fabric at 95 - 98 °C into a bath containing

1 - 2 ml/l DHK 189 

2 g/l DHK 150

run two ends, drop the bath, scour at highly alkaline pH or bleach.

Jeans treatment

Jeans usually are treated in rotary drum type washing machines. Desizing is the first processing step :

1    ml/l DHK 189 

1 - 2  g/l DHK 116

DHK 117 or  DHK 120

15 min / 60 °C


The use of DHK 189 is especially of interest to remove exotic sizes such as manioc starch which are difficult to remove with normal desizing enzymes at

60° C. In the instance temperatures of

70 - 80 °C are recommended.

Inquiry Now
If you have any questions, please leave us a message and we will get back to you in the first time!

Qingdao Hengke Fine Chemicals Co.,Ltd