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Charcoal Block
Charcoal Block (Product Code: SLE/CH/95) is a block of natural charcoal used as the working surface when soldering with a flame. While the joint is heated, the charcoal absorbs oxygen from around the work, which helps prevent firestain on silver, and the soft block can be carved with small dips in which scraps of silver melt into neat round balls. It also protects the bench beneath from the heat of the torch. Metalwork and jewellery-making students, craft workshops and chemistry teaching labs all use it. The block is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, as part of its range as a lab consumables supplier in India.
Key Details
| Parameter | Detail |
|---|---|
| Type | Natural charcoal block |
| Purpose | Surface to solder on |
| Key property | Absorbs oxygen during soldering to help prevent firestain |
| Workability | Soft enough to carve dips for forming small round balls of silver |
| Surface protection | Shields the work surface from the heat of a flame torch |
| Supplied as | Individual block; ask us for current dimensions and pack quantities |
Typical Use
Lay the pieces to be joined on the flat face, apply flux and solder, and play the torch flame over the work; the glowing charcoal reflects heat back into the joint and keeps oxygen away from the hot metal. To make granules or small spheres, scrape a shallow hollow into the block with a scriber, drop in a clipping of silver and heat until it draws up into a ball. Because the block is soft, it wears with every session, and some users tie iron wire binding around it to stop it breaking apart over long use.
In school chemistry, a charcoal block is also the traditional support for the charcoal cavity test in qualitative analysis, where a little of a salt is heated in a hollow using a blowpipe flame. Whichever way it is used, let the block cool fully and check that no part is still glowing before putting it away, and store it somewhere dry. Labs ordering from a chemistry consumables supplier in India often keep a few spare blocks for exactly this reason.
Supplier
This charcoal block is supplied by Jain Scientific Equipments Private Limited, the company behind the ScienceLab brand, based in Ambala, Haryana, India. Alongside the laboratory apparatus it manufactures, the company supplies consumables so institutions can source a complete bench set from one vendor. Visit our company profile to learn more.
Related Chemistry Lab Equipment
Apparatus used with a charcoal block for flame work:
- Blow Pipe Brass — directs a fine, hot flame onto a sample sitting in a charcoal cavity
- Bunsen Burner — the usual flame source for blowpipe work in school labs
- Micro Burner — a smaller flame for delicate heating on the block
- Crucible Tong — for moving hot pieces off the block safely
Explore the full Chemistry Lab Equipment range for burners and heating accessories.
Frequently Asked Questions
Why solder on charcoal instead of a ceramic board?
Charcoal absorbs oxygen around the joint, helping to prevent firestain, and it can be carved to hold small parts or form balls of silver. It also protects the surface underneath from torch heat.
How can I stop the block from cracking?
Tying iron binding wire around the block helps hold it together as it wears. Avoid dropping it and let it cool slowly after use.
Can it be used for the charcoal cavity test in chemistry?
Yes, that is a traditional use: a small sample is heated in a hollow in the block with a blowpipe flame, under teacher supervision and with good ventilation.
How long does a block last?
It is a consumable, so each heating burns away a little of the surface. Life depends on how often and how hard it is used, so there is no fixed figure.
What size is the block?
Dimensions are not listed on this page. Please ask through our contact page and we will confirm the current size.
Can you supply blocks in quantity for a workshop or school?
Yes. We supply institutions and distributors in India and international markets; tell us the number of blocks and delivery location for a quotation.
Request a Quote
Place the Charcoal Block in our enquiry cart or contact us with your quantity and we will respond with a quotation.
Last updated: 24 September 2026
