Fortafix High Temperature Adhesive - Heavy Grade

A cold setting dense, white, water based ceramic paste. Heavy Grade is ideal for bonding, assembling, sealing, jointing or repairing glass, ceramics, metals, quartz, steatite etc. Fortafix Heavy Grade
possesses excellent adhesive, thermal, electrical and mechanical properties. Maximum continuous working temperature is > 1000°C.

Typically Used For

Elements, Heaters, Hot Plates, Resistors, Ovens, Thermocouples.

Suitable For

·  Thin films/Coating - Yes
·  Bonding - Yes
·  Encapsulation - No
·  Thick Sections - No

Property

Value

Major Constituent

Alkali Silicate Glass, Inorganic Oxides

Ready Mixed or 2 part

Ready Mixed

Dispensable

Yes

Relative Viscosity

Viscous Paste

Coverage Rate/Coating Thickness

Softening Temperature (°C):

1250°C

Melting Temperature (°C):

1350°C

Wet Density (g.cm-3):

2.75

Colour:

White

Compressive Strength:

Thermal Conductivity (W.m-1.K-1):

1-2

Thermal Expansion (x10-6C-1):

Dielectric Strength (KV.mm-1) @ RT:

Volume Resistivity (Ωcm) @ RT:

pH:

13

Expansion on Setting %:

0

Shrinkage (Linear %): 150-500°C

Shrinkage (Volume %): 150-500°C

Hardness Moh’s Scale

Oxidation Resistance

Excellent

Alkali Resistance

Can be re-dissolved at high pH & temperature

Acid Resistance

Excellent

Cure Guide

Water based product - requires heat curing.

Shelf Life:

12 Months

Packaging:

250ml, 1 litre, 5 litre, 25 litre or other to special order.

Additional Information

Application

IT IS ESSENTIAL THAT ALL SURFACES TO BE BONDED ARE FREE FROM OIL, DUST OR ANY FORM OF SURFACE COATING OR CONTAMINATION.
·  Stir contents of the container prior to use, to overcome the effects of any settlement of the ingredients during storage.
·  Ensure that all surfaces to be bonded sealed or insulated, are degreased, clean and free from contamination.
·  A light surface abrasion of the material to be bonded will increase the amount of surface area available for adhesion and will give improved mechanical key.
·  Apply the adhesive to all surfaces to be bonded.
·  Join and apply moderate pressure to ensure even anchorage and solid contact of the surfaces to be bonded, ensure that all surface are fully wetted by the adhesive.
·  Secure the components and allow the adhesive to set and harden.

Curing

This product is water based. In order to cure of the material it is necessary to fully dry & dehydrate the adhesive, by heating as gently & progressively as time and circumstances will allow. The ease by which full curing can be achieved is dependant on the porosity of the substrate, as well as the amount of available surface through which the adhesive film can dry.
The cement should be allowed to harden at a minimum air temperature of 20°C until initial set has taken place. After this period the hardening process may be accelerated using the following typical schedule;
·  Heat from 20° to 80°C @ 4°C per minute (15 minutes). Hold for 10-20 minutes
·  Heat from 80° to 140°C @ 2°C per minute (30 minutes). Hold for 120-180 minutes
·  Heat from 140° to 200°C @ 0.2°C per minute (300 minutes).
·  Above 200°C - raise temperature @ 1°C per minute to required temperature, allow to cool progressively.
Hardening and curing times given are approximate in view of possible variations in adhesive volume, glue line thickness, and substrate conditions, all of which will influence curing times