is this strong enough to hold the cast iron hood on a Victorian fireplace?

It depends what you mean by hold, if you mean taking weight then I would say no, this is a cement to fill gaps which can then take a high heat

Can this be used on BBQs to seal air gaps?

Yesi used it to seal up my offset smoker but make sure you apply it with a wet finger and do small bits at a time or its messy and flakes off after two or three smokes

Can I use it to fix small cracks and gaps of the grout of a tiled patio?

It's fire cement for Fireplace, Stove, Boilers etc. which is what we used it for . Unable to advise on tiled patio!

Can this be used to fill cracks on a back board of a real flame gas fire and be painted with heat resistant black paint

I used this on a solid fuel appliance and it's very good. In your case because you're dealing with gas, maybe it's better to ask a gas engineer in case of leaks? Best be safe.

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Black Fire Cement 1250 C - 310ml for Fireplace, Stove, Boilers etc

Product ID: 48224501

Details

Brand
VITCAS
Item form
Paste
Special feature
converts to
Specific uses for product
Fireplace Oven

🔥1250°C heat resistance

🪨rock-like hardness on curing

🛠️310ml easy-apply cartridge

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Description

🔥 Seal the heat, fix the future!

PRO GRADE ADHESION - Superior bonding power that holds up under intense heat and daily wear.
ROCK SOLID DURABILITY - Transforms into a rock-like finish upon air exposure, guaranteeing long-lasting strength.
EFFORTLESS APPLICATION - Smooth paste in a 310ml cartridge ensures precise, mess-free repairs every time.
UNMATCHED HEAT ENDURANCE - Withstands extreme temperatures up to 1250°C, perfect for fireplaces and boilers.
VERSATILE REPAIR SOLUTION - Ideal for patching firebricks, metals, stone, and clayware—your all-in-one fix.

Vitcas Black Fire Cement is a high-performance, heat-resistant adhesive paste designed for repairing and patching fireplaces, stoves, boilers, and ovens. It withstands temperatures up to 1250°C and hardens to a rock-like finish upon exposure to air, providing durable, professional-grade repairs with easy application from a 310ml cartridge.

Specifications

ASIN	B004646CLM
Best Sellers Rank	25,501 in DIY & Tools ( See Top 100 in DIY & Tools ) 458 in Sealers
Brand	VITCAS
Colour	black
Compatible Material	Various
Container Type	Pail
Customer Reviews	4.5 4.5 out of 5 stars (6,882)
Full Cure Time	3 Days
Included Components	310ml Cartridge with nozzle
Item Form	Paste
Item Package Quantity	1
Item Type Name	Vitcas Black Fire Cement 310ml Cartridge
Item Volume	310 Millilitres
Item Weight	1.32 Pounds
Manufacturer	VITCAS
Manufacturer Part Number	jpsj-0312-175
Material	The primary material used in the manufacturing or creation of Vitcas Black Fire Cement is not explicitly mentioned product details. However, since item_form 'Paste', it can be inferred that fire cement mainly made a bonding adhesive substance, which specified example_valid_values. Therefore, generated value for 'material' 'Bonding Adhesive'.
Model Number	A665207
Number of Pieces	1
Other Special Features of the Product	converts to rock-like hardness, easy patching and repairing
Specific Uses For Product	Fireplace, Stove, Boilers, Oven
UPC	798256117770
Unit Count	310.0 millilitre
Viscosity Level	Medium
Water Resistance Level	Not Water Resistant

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