Products
Exothermic Hot Topping Compound
Keep the riser liquid. Get sound castings and a higher yield.
In ingot casting and foundry work, the riser is the last part of the casting to solidify — and it is where shrinkage cavities and pipe form. An Exothermic Hot Topping Compound — also called riser exothermic compound, anti-piping compound or exothermic topping — is added to the top of the riser. It reacts with the liquid steel and releases heat, keeping the riser molten for longer so it keeps feeding metal into the shrinking casting below.
ArcSteel supplies three grades: Exothermic Hot Topping Compound for general riser practice, Exothermic Feeding Compound which combines heat generation with active feeding, and Exothermic Covering Compound for hot-top practice where insulation matters as much as heat. Grades are matched to ingot weight, section size and the steel grade being cast.
The practical result is measurable: less pipe, less top cropping, a higher yield per ingot, and less re-work on rolled or forged product.
Available grades
- Grade
Exothermic Hot Topping Compound
The standard grade for ingot moulds and foundry risers — generates heat to delay solidification at the head.
- Grade
Exothermic Feeding Compound
Combines heat release with active feeding, so the riser keeps topping up the casting as it contracts.
- Grade
Exothermic Covering Compound
For hot-top practice — insulates the head while generating heat, and forms a soft crust that is easy to remove.
What it does for your line
- Keeps the riser molten longer — shrinkage cavities and pipe stay in the head
- Higher yield per ingot: less top cropping, more saleable metal
- Sound internal quality, so less rejection at rolling and forging
- Consistent ignition and burn rate — the same result heat after heat
- Lighter, easier-to-remove crust that speeds up mould preparation
- Grades matched to ingot weight, section size and steel grade
Technical data
| Silicon (Si) | 50 ± 5 % |
|---|---|
| Carbon (C) | < 2.0 % |
| Aluminium (Al, total) — expressed as Al₂O₃ | 10 ± 3 % |
| Iron oxide (Fe₂O₃) | < 20 % |
| Other constituents | < 15 % |
| Moisture (H₂O) | < 1.0 % |
| Temperature reached at 40 min | 1,200 °C |
| Calorific value (assured) | ≥ 10,000 kJ/kg |
| Grades available | Figures above are the carbon-free grade. Carbon-bearing grades and tailored heat-release curves are available on request. |
Figures above are indicative. Contact us to confirm against your steel grades and furnace practice.
All grades can be customised — composition, particle size, melting behaviour, alkalinity and packaging are all adjustable. Send us your steel grade and furnace practice — we will recommend an existing grade or formulate one to suit.
Packing & delivery
- 10 kg woven PP bag with inner liner
- 1,000 kg jumbo bag (FIBC)
- Custom bag weight and private labelling available
- Palletised and shrink-wrapped for sea freight
Applications
Also known as: riser exothermic compound · exothermic feeding agent · anti-piping compound · exothermic topping powder · riser flux
Products
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Request a quote for Exothermic Hot Topping Compound
Tell us your monthly volume and destination port. We will quote with a packing option that suits the shipment.
Have us run a trial batch to your specification
Send us your specification or a sample of what you run now. We will formulate to match it and send a trial batch before you commit to volume.