Fortafix Chemical Setting Adhesive Cement

Fortafix Chemical Setting Adhesive Cement - QS/B4

Fortafix Chemical Setting Adhesive Cement - QS/B4

A 2 part (filler/binder) water based chemical setting ceramic paste. QS/B4 Chemical Setting Adhesive is ideal for bonding, assembling, sealing, jointing or repairing glass, ceramics, metals, quartz, steatite etc. Fortafix QS/B4 Chemical Setting Adhesive possesses excellent adhesive, thermal, electrical and mechanical properties. Maximum continuous working temperature is >1000° C. Manufactured from same materials as Light, Medium and Heavy Grades, QS/B4 can be mixed to these consistencies.

Typically Used For
Chemical setting electrical cement for: Elements, Heaters, Hot Plates, Resistors, Ovens, Encapsulating Elements, Potting, Embedding

Suitable For
Bonding - Yes Thin films/Coating - Yes Thick Sections - Yes Potting/Encapsulation - Yes

Property		Value
Major Constituent		Silicate Glass Binder, Inorganic Oxides
Ready Mixed or 2 part		2 part Chemical Setting Cement
Dispensable		Yes
Relative Viscosity		Mixes to a viscous paste
Coverage Rate/Coating Thickness
Softening Temperature (°C):		1100°C
Melting Temperature (°C):		1200°C
Wet Density (g.cm-3):		2.18
Colour:		WhitCream/Off-white
Compressive Strength:
Thermal Conductivity (W.m-1.K-1):
Thermal Expansion (x10-6C-1):		10.5
Dielectric Strength (KV.mm-1) @ RT:		7-10
Volume Resistivity (Ωcm) @ RT:		>10^7
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		Good
Acid Resistance		Excellent - except hydrofluoric
Cure Guide		Water based product - requires heat curing
Shelf Life:		12 Months
Packaging:		500g, 1kg containers or special order

Additional Information
Binder Solids - % by Weight: 38.54 Wet Density - 2.18 Mix Binder and Filler in ratio 3 pbw Filler: 2 pbw Binder.

Application
Mix Binder and Filler in ratio 3 pbw Filler: 2 pbw Binder. (See note below). IT IS ESSENTIAL THAT ALL SURFACES TO BE BONDED ARE FREE FROM OIL, DUST OR ANY FORM OF SURFACE COATING OR CONTAMINATION. 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 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, so that all surfaces are fully wetted. Secure the components and allow the adhesive to set and harden.

Curing
The cement should be allowed to harden at a minimum air temperature of 20°C until the initial set has taken place. If heat curing is practicable the hardening process may be accelerated using the following schedules; 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.

Associated Documents
MSDS - QS/B4 Binder MSDS - QS/B4 Filler

Mixing Proportions

Component	Form	Quantity
Filler	Powder	3 Parts by Weight
Binder	Liquid	2 Parts by Weight

Note - The consistency produced by the above mix should prove satisfactory for most applications. If necessary the Binder may be varied by up to 20% to meet special requirements. Additional binder will extend setting time. Reduced binder will accelerate setting time. Sufficient cement only should be mixed for immediate use. Hardened adhesive cement cannot be reconstituted.

Weigh quantities given above precisely using a balance.
Add powder filler to liquid binder and mix for a minimum period of 3 - 5 minutes until a smooth homogeneous paste is formed. Mixing is simple and complications should not occur.
If the cement is to be used for gap filling or moulding, care should be taken to avoid undue entrainment of air as this will cause a porous and weakened glue line and bond.
Mixing apparatus, tools and brushes should be washed out in water immediately after use and before the adhesive can harden.