VIKOPROOF - SDK Potassium Silicate Cement
SDK Potassium Silicate Cement
‘VIKOPROOF’- SD’ and ‘VIKOPROOF – SDK (hereinafter referred to as silicate Cements) acid proof cements have been developed to their present pitch of perfection over more than 25 years. They are special products which have become almost essential when building modern acid proof plants. Their judicious use, often together with ‘VIKOPROOF’ range of resin based cements makes it possible to resist attack under almost all conditions met with in practice.

‘VIKOPROOF’ Silicate cements are water glass cements which can be used to fix and point acid proof tiles and bricks when building acid proof plants and buildings.

‘VIKOPROOF’ Silicate cements are supplied as a two pack system consisting of :
• Inert filler mixed with suitable, catalysts, accelerators, etc.
• Sodium Silicate and Potassium Silicate liquid binder respectively.

MIXING RATIO : 3 Parts of powder: 1 part of liquid binder
POT LIFE : - The pot life of silicate cements are given in the following table :
TEMPERATURE IN C 15 20 30 40
‘VIKOPROOF’-SD 40 min. 30 min. 20min. 10min.
‘VIKOPROOF’-SDK 120min. 40min. 30min. 20min.
 

The mixed silicate cement mortar must be used for application before its pot life. Any cement left
After this time has elapsed must not be used. Any silicate cement not used before the start of
Hardening cannot be made usable by further addition of silicate liquid. Lower temperature lengthens and higher temperature shorten the setting time.

Completely hardened Silicate Cements meets IS4832 Part I. the properties are as follows:-

 
VIKOPROOF –SD VIKOPROOF – SDK
Working time 20 minutes 40 minutes
Flexural Strength Kg/cm2 40 45
Compressive strength After 7 days (in kg/cm2) min 120 175
Bond strength (in kg/cm2) min 5 7
Temperature Limit c 800 1000
 

Method of testing As per JS4456 Part I

Silicate cements cannot be applied directly to foundation of concrete or ordinary cement and therefore an insulating layer must first be applied to such foundations. The concrete or cement surface should be first given of our anti corrosive ‘VIKOSEAL.-AR’ primer. Over the dried, primed surface a intermediate coat of our ‘VIKOSEAL-AR’ Bitumastic of desired thickness shall be applied.

In case of pressure vessel which must withstand stringent chemical and thermal stresses circulation of acid within the pores fo the brickwork is often possible because of applied pressure and vaccum.
In such cases it is necessary to use an insulating interlines which is impervious to liquids between the brickwork & the metal wall. Following interlines are recommended.
• Homogenous Lead Lining
• Rubber Lining
• P.V.C. Lining
• Epoxy coating or screeding

Silicate cements must not be mixed with ordinary cement or with other fillers or additives but must be used in their original unadulterated state.

CHEMICAL RESISTANCE :

R : Resistant; LR : Limited Resistance; NR : Not Resistant

Advantages of ‘VIKOPROOF- SDK’ cement over ‘VIKOPROOF-SD’

‘VIKOPROOF –SDK’ Potassium Silicate Cement has advantages over ‘VIKOPROOF-SD’ Sodium Silicate Cement linings in that eh former is not subject to crystal formation in the pores of the cement. Such crystal formation is observed in the later especially where sulphuric acid, acetic acid or phosphoric acid is being used, particularly if the tiles are not continuously rinsed with water.
SHELF LIFE : Silicate cements have indefinite shelf life if stored in proper moist free conditions.

PACKING : Powder : 50 kg packed in hessian Bags with LDPE liner.
Liquid Binder : 17kg, 35kg, 50kg, 250kg, packed in M.S. Drums. Special
Packing of liquid can be given as per requirement.