Special mastic is a blend of bitumen and graded acid-resistant fillers. It consists of Special Mastic Primer and Special Mastic Mortar and supplied in cake form. The advantage of this product is that it can be used at a higher temperature compared to other mastic and can be used on vertical surface for any height without use of chicken mesh as reinforcement.

Special Mastic is used as an exposed lining on floors where traffic is medium or non-existent and chemical spillages are expected up to 60º C. It is used as an impervious underly menbrane on floors, channel lining, sumps etc., which are constructed out of concrete over which acid proof tile / brick lining is provided. It can also be used as an underly membrane inside tank holding liquids where mechanical abuses and spillages at higher temperatures are expected.

It is used in different industries like Steel and Pickling, Dyestuff, Rayon, Food, Defence, Automobiles, Chloroalkali, Petroleum Industries etc.

The Concrete floor should have a minimum of 1-2% slope to ensure draining of spilled liquids. On vertical surfaces, if the height of the wall is more than 3 meters, it is recommended to have V-grooves at an interval of 2 meters for good anchoring purpose. applied on the dry, even, concrete before application of Special Mastic.

Special Mastic system comprises of Special Mastic Primer followed by Special Mastic Mortar. Recommended minimum thickness of Special Mastic Primer and Special Mastic Mortar is 4 mm and 16 mm respectively. In other words, the total thickness of entire system should be atleast 20 mm. This would ensure to achieve a membrane without any pin hole or crack extending through the full thickness of the membrane. The layers should have staggered joints.

The area is divided in to convenient number of bays. Wooden reapers of thickness equal to the required mastic thickness is fixed to maintain uniform thickness.

Special Mastic Primer is broken into small pieces and placed in a tar / asphalt boiler and heated. To prevent charring of the primer, the material is kept in motion using a wooden plank. At a temperature of 180º - 200ºC, the primer will be in a molten condition. Mastic is taken out from the boiler, poured over the surface and spread to a uniform thickness using a wooden float. The layer is spread as thin as possible to minimize air or moisture entrapment. Special care is taken to eliminate bubbles since these imperfections, if not removed would continue through subsequent layers. It is recommended that two primer layers are applied each of 2 mm thickness.

Mortar cakes are broken into small pieces and heated at a temperature of 200º - 240ºC, when the material attains a butter like consistency. It is applied in one or two layers over the primer and thoroughly worked on till it formed a membrane. The covering should be done piece by piece and care taken to maintain the temperature so that a perfect weld is made.

Generally Special Mastic is resistant to most inorganic acids of dilute and moderate concentration and to alkalies. However, it is not resistant to oxidising acids like Chromix and nitric and organic acids, solvents and oils. For individual chemicals resistance, please contact us.

Both primer and mortar are packed in gunny bags of 30 kg each. However if one full truck load is sent, then only one grade is packed in gunny bag for identification.

During transport, both grades must be protected from direct exposure to heat.

Both Special Mastic Primer and Mortar are to be kept preferably in a shady place, away from heat.
Shelf life : 1 year when stored under shade at ambient temp.

Molten Mastic must be handled carefully. To avoid direct contact with skin, it is essential to wear hand gloves and gum boots.

While JENNY CORROSION CONTROLLERS strives to ensure that any advice, information or recommendation given are appropriate and correct, it cannot accept any liability directly or indirectly arising out of the use of the product, since the method and place of application of the products are beyond our control.

Whilst JENNY CORROSION CONTROLLERS strives to ensure that any advice, information or recommendation given are appropriate and correct, it can not accept any liability directly or indirectly arising out of the use of the products, since the method and place of application of the product are beyond its control.