Would these crucibles work safely in an electric resistance furnace (Kanthol coils, or ceramics/pottery kiln for example)?

I can't say for sure.... the pottery kiln I'm guessing for sure they would work. As for the electric resistance (kanthol coils) as long as the graphite can't contact the coil they should be ok , I use mine (2) in a homemade wood pellet foundry that gets super hot when I start forcing the air in.... These crucibles have handled a few occasions of me not being patient and with little to no preheating put them right on the fire and they seem to be fine... Remember to flux them first....

Do i preheat it to 400 C or F for an hour?

I have no way to measure the temperature. Just know that I heat it slowly nd it has tolerated the melting of brass well.

Worst case scenario if I tried melting aluminum in a charcoal forge with this product?

I use mine in a pellet burning furnace

Instructions say to cure crucible in oven with borax. But borax melts at 1,369*F. Does it mean foundry instead of oven?

I just put mine in the house oven and set it for max temp. I set the oven to "self clean" which heats and holds higher temp. seems to have worked fine.

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#4 8KG MegaCast, Foundry Clay Graphite Crucibles Black Cup Furnace Torch Melting Casting Refining Gold Silver Copper Brass Aluminum

Product ID: 88866475

⏳Durable thick clay-graphite walls

🔥Up to 2912°F heat resistance

⚖️8kg metal capacity

809.21 DT

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Description

🔥 Cast your future in fire — melt metals like a master!

MELT LIKE A PRO - Handles gold, silver, copper & more with ease
PRECISION DIMENSIONS - 6.2" x 5.75" outside, 4.5" x 6" inside for large batches
RELIABLE RESILIENT - Thick clay-graphite blend ensures long-lasting performance
VERSATILE TORCH READY - Compatible with propane furnaces & standard torches
BUILT FOR EXTREME HEAT - Withstands up to 2912°F (1600°C) for high-temp casting

The #4 8KG MegaCast Foundry Clay Graphite Crucible is engineered for professional-grade metal melting, supporting precious and non-precious metals up to 2912°F. Its robust clay-graphite construction and precise dimensions make it ideal for torch and propane furnace use, delivering reliable performance for serious metal casters.

Specifications

ASIN	B07JLGDKJK
Best Sellers Rank	#281,841 in Arts, Crafts & Sewing ( See Top 100 in Arts, Crafts & Sewing ) #389 in Jewelry Casting Tools
Customer Reviews	4.4 4.4 out of 5 stars (393)
Date First Available	August 17, 2017
Item Weight	2 pounds
Item model number	222-A33
Product Dimensions	5.25 x 5.75 x 5 inches

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809.21 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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