SimpMelts Graphite Crucible & Ingot Mould 1 kg – Grooved High-Temp Crucible for Gold, Silver, Copper

SimpMelts graphite crucible and ingot mould is a grooved, high‑temperature vessel sized for up to 1 kg of metal, built for safe handling and long service life in electric melting furnaces.

This crucible and mould set is designed to pair with PID electric melting furnaces such as the SimpMelts 1400W unit, giving hobbyists and small-scale metalworkers a reliable tool for melting nonferrous metals. Made from dense natural graphite with a glazed finish, the pieces prioritize thermal stability, corrosion resistance and easier removal from the furnace. The grooved profile accepts tongs securely and helps reduce metal clinging during pours.

How big is this crucible and what metals will it hold?

The crucible holds up to 1 kilogram of metal (approximately 130 ml volume) and is dimensioned for compact furnaces. Typical use includes gold, silver, copper, aluminium and brass when processed in appropriate electric or protected-atmosphere environments.

• Capacity: 1 kg / 130 ml
• Dimensions: 65 mm diameter × 125 mm height
• Weight: 250 g
• Suitable for a wide range of nonferrous metals in electric furnaces

What makes the grooved graphite design useful?

The grooved outer profile improves contact points for tongs and cuts down on molten metal sticking to the crucible walls, making removal and handling steadier and more predictable. Graphite’s natural thermal conductivity also helps heat distribution while the low expansion reduces the risk of cracking under rapid temperature changes.

• Grooves allow secure gripping with crucible tongs
• Minimizes metal waste by easing release at pour
• Low thermal expansion for better dimensional stability
• Even heat transfer for consistent melt behavior

How hot can this crucible go and are there usage limits?

The crucible performs robustly in modern electric melting systems but has environment-dependent limits. In electric air furnaces it resists temperatures up to about 3200°F; in vacuum or gas-shielded setups it withstands much higher temperatures. Avoid direct exposure to open carbon or charcoal fires above roughly 752°F (400°C) to prevent oxidation and premature wear.

• Electric air furnace limit: up to ~3200°F
• Vacuum/gas-protected limit: up to ~5000°F
• Do not use in open charcoal/carbon furnaces above ~752°F
• Follow furnace manufacturer safety and ventilation guidelines

How durable is the crucible and how long will it last?

The crucible is moulded from dense natural graphite and finished with a protective glaze designed to improve corrosion resistance and extend service life. Proper handling—using tongs on the grooved profile, avoiding thermal shock, and operating within recommended atmospheres—will maximize cycles before replacement is needed.

• Dense graphite construction for mechanical strength
• Glazed surface reduces chemical attack and wear
• Minimize rapid temperature swings to prevent cracking
• Regular inspection recommended after repeated high-heat cycles

Who is this for: This SimpMelts crucible and ingot mould set suits jewellers, small foundries, metal hobbyists and repair shops that use electric PID melting furnaces and need a compact, reliable vessel for nonferrous metal work. It’s intended for users who understand furnace atmospheres and follow safe handling practices—especially when working at high temperatures or in protected-gas setups.