DATA SHEET: LUBISOL Si-Seal kit
Monolithic Silica Repair Kit

1. General Description

  Lubisol Si-Seal is a monolithic silica repair kit used for hermetic sealing and hot repair of glass furnace silica crowns. It is supplied as a dry mix packed in 25 kg paper bags and a liquid chemical bond, packed in 13 kg plastic containers. They are mixed in a mortar mixer just before use in the following proportion (weight %): dry powder – 85 : liquid bond -15.

  Some water is added to obtain the desired fluidity of the mix.

  The most important features of LUBISOL Si-Seal are:

• Strong and durable adhesive bond with silica refractories up to 1620 ° C, and a coefficient of thermal expansion - very similar to the one of silica bricks. The sealing process creating a very strong bond is described as Cold Chemical Welding.

• Very high corrosion resistance against the action of alkalies and other fluxes.

2. Way of Application

  Lubisol Si-Seal is applied as a protection hermetic sealing layer by patching over the silica crown in a thickness of 15 mm. The application can be done during the heat-up of the furnace at 800 °C furnace temperature, or after the heat-up of the glass furnace.

  Lubisol Si-Seal is very suitable for hot application in the form of plastic balls to fill up the Rat-holes during a hot repair or the expansion joints of a silica crown after heat-up.

  Lubisol Si-Seal is a heat setting composition, and it is converted into a hard body under the action of the heat of the silica crown.

  An Application Technology is delivered by the supplier, together with the material.

3. Chemical Composition and Properties

3.1. Chemical Composition (%)

SiO₂
Al₂O₃
Na₂O + K₂O
Fe₂O₃ + TiO₂
CaO + MgO
P₂O₅

> 92.0
> 1.8
0.6
0.6
2.6
2.6

3.2. Other Properties

Maximum grain size (mm)
Material requirement (kg/dm3)
SG after firing at 500 ° C (kg/dm3)
Thermal conductivity at 20 ° C (W.mK)
Thermal conductivity at 500 ° C (W.mK)
Working temperature ° C

5.00
2.00
1.80
1.15
1.38
1620

3.3. Safety Data Sheet

  The Liquid Bond Lubisol LFS contains a diluted mineral acid – H₃PO₄ !

  Safety measures should be taken to protect the eyes and hands of the workers from the action of the acid. They must be wearing protective goggles and gloves. The acid is easily soluble in water. If needed for any reasons, the skin and eyes should be washed with clean water.