**Adding A1 Retarder**

The standard processing time of A1 is between 20 and 25 minutes. If desired, it is possible to extend this processing time. We recommend a processing time of max. 1 hour.

As a rule of thumb, you could add 0,3% A1 Retarder to the total A1 weight of the mixed A1 for 20 minutes extra processing time. This is 3 gram per kg A1 for 20 minutes extra processing time. This time also depends on the A1 Powder and can deviate. That is why we advise you to perform a small test beforehand.

We recommend that the A1 Retarder is first added to the A1 Liquid before it is mixed with A1 Powder.