Use and Care Manual

Technical Data Sheet
Rutland Fire Clay Company
Rutland Fire Clay CompanyRutland Fire Clay Company
Rutland Fire Clay Company P.O. Box 340, Rutland, VT 05702-0340 [phone] Fax [phone]
Outside US & Canada Call [phone] Web Site: www.rutland.com
Fireplace Mortar
Item 63, 63B, 63G
• Meets ASTM E136-79
• Withstands temperatures up to 2000°F
• Available in three colors, black, buff & gray
• Requires heat to cure
Description:
Fireplace Mortar is a high temperature resistant
silicate mortar for repairing cracked and chipped
firebrick and repointing mortar joints in a firebox.
When air dried and heat cured, it becomes as hard
and strong as firebrick.
Performance Characteristics:
• As hard as firebrick after proper curing.
• Adheres well to masonry
• May be painted when heat cured
• Does not contain asbestos
Recommended Uses:
It is the best choice for joining masonry to masonry.
Use it to tuckpoint between firebricks and repair
broken firebricks where the cracks are 1/8” or less.
It Can be layered for deeper cracks.
Surface Prep:
Clean crumbling brick, mortar and soot from the
area to be repaired. Brush on water to wet the work
area thoroughly. Use in temperatures between 40°F
and 100°.
Application:
Cut the nozzle tip at an angle with an opening not
less than 1/4” x 1/8”. Put the cartridge in a standard
caulking gun. Fill the crack or hole with the mortar
and smooth with a putty knife dipped in water.
Protect new mortar from direct water contact until
fired. Air dry for 24 hours, but no longer than 30
days. Start a low fire, keeping the temperature
below 220°F until mortar has dried thoroughly. Then
increase heat for the final cure. Heat for 1-2 hours
at 500°F. If crack or joint is more than 1/8”,
multiple layers may be applied. Allow 24 hours to
cure between layers. When tack free, heat for final
cure. For deeper cracks (>0.25”), use Castable
Refractory Cement, Item 600.
Coverage:
Approximately 99 linear feet with a 1/8” bead
Clean up:
Clean mortar off surfaces before it dries using a wet
cloth. Clean up spills with warm water immediately.
Dried mortar must be scraped or chipped away.
Typical Physical Properties:
Solvent Water
Service Temperature Up to 2000°F
Weight/Gallon 14.8 lbs.
Consistency Gunnable paste
Dry Time Air dry for 24 hours
Heat Cure Temperature 500°F
Color Black - 63, Buff - 63B,
Gray - 63G
Storage/Handling Do not store in extreme
heat or cold.
Limitations:
Not for exterior use. Use Rutland Chimney
Masonry Patch, item 89 for exterior use. If mortar is
not heat cured, a white powder will form on the
surface and it will lose adhesion. Does not adhere to
metal. Do not use where excessive joint movement