Sika® Sigunit® L-72 AF

Shelf life when stored in unopened original containers, protected from direct sunlight and frost and kept at temperatures between 50°F and 86°F (10°C-30°C) is 6 months.

Store in stainless steel or plastic container as the low pH of the admixture may cause corrosion if stored in normal steel container, which might affect the performance of the admixture. Protect from direct sunlight, heat and frost. If these conditions are unattainable, Sika® Sigunit® L-72 AF may precipitate. If this occurs, the performance of Sika® Sigunit® L-72 AF may be adversely effected and the regional Sika representative or technical service department at 1-800-933-7452 should be contacted.

Approx. 1.42

Sika® Sigunit® L-72 AF is dosed and added on-site by a liquid dispensing system. Optimum dispersion in the shotcrete is governed by nozzle configuration and shotcreting techniques. Important information: The concrete temperature should not be lower than 59°F (15°C) when shotcreting in thick layers - 4 inches and above (100 mm and above). Use of Sika® Sigunit® L-72 AF requires the technically correct installation of dosing and conveying equipment. Metal components that come into direct contact with the product should be fabricated of stainless steel. Do not use brass parts.

Combination with other Sika admixtures: Sika® Sigunit® L-72 AF is compatible with Sika’s water reducing, high range water reducing, hydration control admixtures and other admixtures. Trials with local materials is always recommended to verify performance.

The most effective dosage must be determined by trial. Dosage rates will vary according to w/c ratio, materials used, ambient conditions, shotcrete methods used and the requirements of a specific project. For general applications Sika recommends a dosage between 4-8% by weight (45-86 fl.oz/100 lbs) of the total cementitious content. The performance of the Sika® Sigunit® L-72 AF will vary according to w/c ratio of the mix. Dosage rates outside the recommended range may be used where specialized materials such as microsilica are specified, extreme ambient conditions are encountered or unusual project conditions require special consideration. In this case please contact your local regional office or technical service department at 1-800-933-7452. The effect of Sika® Sigunit® L-72 AF depends on cement type, cement age, cement content and type of subgrade.