As an exothermic powder manufacturer and supplier in Noida, SG Power Products Pvt. Ltd. makes exothermic welding powder for permanent earthing and lightning protection joints. Exothermic powder reacts inside a graphite mould and produces molten copper, which fuses conductors into one solid joint. Each cartridge is sized for one weld.
As a direct exothermic powder supplier, we sell welding powder, graphite moulds and accessories to contractors, dealers and project buyers across India. Orders range from a single kit to bulk project supply, matched to each joint.
In short, exothermic powder is a mix of copper oxide and aluminium that produces molten copper when ignited in a graphite mould. One cartridge makes one weld, and its weight is chosen from the mould label. It joins copper and steel conductors in earthing systems.
| Composition | Copper oxide and aluminium, with a separate starting (ignition) powder |
| What it makes | Molten copper that fuses cables, earth rods, strips and busbars |
| Joints | Copper to copper, copper to steel, copper bonded rod to cable or strip |
| Physical form | Fine granulized (SG Power datasheet) |
| Colour | Black / dark grey (SG Power datasheet) |
| Cartridge size | Chosen from the mould label, for example 90 g, 115 g, 150 g, 200 g or 250 g |
| SG Power pack sizes | Sealed poly pouches of 200 g, 250 g, 500 g and 1 kg, packed as per requirement (SG Power datasheet) |
| Use with | Graphite exothermic moulds, steel discs, a handle clamp and a flint igniter |
| Reaction time | A few seconds per weld |
| Packing | Sealed, moisture-proof packs with starting powder and steel discs |
| Uses | Earth grids, lightning protection, substations, solar plants, telecom towers, railways |
| Price | On request, after checking your joint list and cartridge sizes |
* Prices are indicative. For the latest price, contact SG Power.
These are SG Power's own technical particulars for its exothermic weld powder, as printed on the datasheet below.
| Manufacturer | SG Power Products Pvt. Ltd. |
| Product | Exothermic Weld Powder |
| Uses | Copper exothermic weld joints for earthing |
| Physical form | Fine granulized |
| Colour | Black / dark grey |
| Packing | Sealed poly pouch |
| Net weight | 200 / 250 / 500 gm and 1 kg packets, as per requirement |
| Test certificate | UL 467 |
About the UL 467 line on the datasheet: UL 467 is the standard for grounding and bonding equipment, and SG Power's datasheet names it as the powder's test certificate. Testing to a standard is not the same as a UL listing, which covers a complete connection system and can be checked in UL's own database. Our guide to UL listed exothermic powder manufacturers explains the difference. If your specification asks for UL listed connections, tell us at the enquiry stage and we'll discuss it openly.
Buy your exothermic powder direct from SG Power, the manufacturer that also makes the graphite moulds and earthing materials it is used with. You get factory pricing, help choosing cartridge sizes, and powder matched to each mould on your earthing drawing.
| From SG Power (Manufacturer) | From a Trader or Reseller |
|---|---|
| Factory pricing, no middleman margin | Reseller margin added |
| Cartridge sizes matched to each mould | Powder and moulds often from different makers |
| Powder, moulds and accessories from one source | Several suppliers to manage |
| Earth rods, conductors and strips from the same maker | Parts may not match |
| Help with joint lists and quantities | Advice varies by seller |
| Customers in 319+ cities | Depends on the reseller |
Many exothermic powder suppliers resell loose stock, while SG Power supplies powder sized for each joint on your drawing.
Exothermic welding powder is a mix of copper oxide and aluminium that reacts when ignited, producing molten copper and intense heat. The molten copper flows from the mould's crucible into the weld cavity and fuses the conductors. The finished joint is permanent, low in resistance and does not loosen.
Exothermic powder is also called exothermic welding powder, exothermic weld powder, weld metal, exothermic welding material, thermite welding powder or earthing welding powder. Buyers also search for exothermic powder for earthing and copper welding powder, and Hindi searches use एक्सोथर्मिक पाउडर. The process is known as exothermic welding, thermite welding or exothermic bonding.
The chemistry is an aluminothermic reaction, also called a thermite reaction: aluminium takes oxygen from copper oxide, releasing heat and leaving molten copper. Because the heat comes from the thermite composition itself, the process needs no external power or heat source. The lighter aluminium oxide slag floats to the top and is cleaned off after the weld. Rail thermite welding uses iron oxide instead, so it produces molten steel rather than copper.
| Part of the Powder Pack | What It Does |
|---|---|
| Weld metal (main powder) | Copper oxide and aluminium that react to form molten copper for the joint |
| Starting powder | A small amount of finer powder sprinkled on top, lit by a flint igniter to start the reaction |
| Steel disc | Placed over the mould's tap hole, so the molten metal flows down at the right moment |
| Moisture-proof pack | Keeps the powder dry until use, because damp powder causes porous welds |
Online searches for exothermic powder show three different products. Exothermic welding powder joins earthing conductors, foundry exothermic powder keeps molten metal hot in castings, and lime slaking powder speeds up lime hydration. SG Power supplies welding powder for earthing, bonding and lightning protection joints, so check the product type before comparing prices.
| Point | Exothermic Welding Powder | Foundry Exothermic Powder | Lime Slaking Powder |
|---|---|---|---|
| Main use | Permanent earthing and bonding joints | Feeding risers and keeping ladle metal hot | Faster lime slaking for mortar and slurry |
| Used with | Graphite mould, handle clamp and flint igniter | Riser sleeves, ladles and moulding boxes | Quicklime and water |
| Result | Molten copper fused to the conductors | Heat that slows cooling and reduces shrinkage | Heat that speeds lime hydration |
| Typical colour in listings | Grey to black | Often brown | Often brown |
| Typical buyers | Electrical contractors, EPC firms and utilities | Foundries and steel plants | Lime, mortar and building-material plants |
This page covers welding powder for earthing joints only. Steel plant and foundry consumables, such as ladle and tundish covering compounds, mould flux, riser and anti-piping compounds and slag coagulants, belong to a different industry.
Exothermic powder works by reacting inside a closed graphite mould that holds clean, dry conductors. The starting powder is lit with a flint igniter, the main powder reacts within seconds, and molten copper melts the steel disc. The copper then flows into the weld cavity and fuses the conductors.
This four-step exothermic welding procedure shows how to use exothermic welding powder:
Prepare the conductors and mould
Clean and dry the conductors, heat the mould and lock it with the handle clamp.
Add the steel disc and powder
Place the steel disc over the tap hole, then pour in the cartridge of welding powder.
Ignite the starting powder
Sprinkle the starting powder, close the lid and ignite it with a flint igniter.
Open the mould and remove the slag
Wait for the joint to cool slightly, open the mould and remove the slag.
The reaction reaches over 2,000°C, well above copper's 1,085°C melting point, so it fuses copper and steel conductors into one piece. The joint is strong and durable because fusion welding turns the conductors and copper into one solid casting with a molecular bond, rather than pressing them together. With no bolted contact surfaces to loosen or corrode, joint resistance stays stable over the life of the installation. For mould types, parts and care, see SG Power's exothermic mould page, and for making a joint on site, our exothermic welding procedure.
Planning an earthing grid or lightning protection system? Send your joint list for powder and mould sizes.
Exothermic welding uses a few terms that appear on mould labels, powder packs and quotes. Knowing them makes it easier to order the right exothermic powder, check a supplier's quote and follow the welding steps on site. This table explains each term in one line.
| Term | Meaning |
|---|---|
| Crucible | The upper chamber of the graphite mould, where the exothermic powder reacts |
| Tap hole | The opening between the crucible and the weld cavity, closed by the steel disc |
| Weld cavity | The shaped space around the conductors that the molten copper fills |
| Cartridge (shot) | One pre-weighed charge of exothermic powder for one weld, marked in grams |
| Aluminothermic reaction | The reaction in which aluminium takes oxygen from copper oxide and releases heat |
| Slag | Aluminium oxide left after the reaction, which floats on top and is removed |
| Handle clamp | The tool that holds the mould closed and tight around the conductors |
| Flint igniter | The spark gun that lights the starting powder |
Before each weld, check that the cartridge weight matches the mould label and that everything is dry, level and locked. Most failed exothermic welds come from moisture or a mismatch between powder, mould and conductor. This six-point check takes a minute and saves wasted cartridges.
Right mould and cartridge: the mould suits the conductors, and the cartridge weight matches its label.
Steel disc in place: the disc sits flat over the tap hole before the powder goes in.
Snug fit: conductors fit the openings firmly, without forcing or gaps.
Level mould: the mould sits level, so molten copper fills the cavity evenly.
Dry conductors and mould: strands, rods and the mould are fully dry; heat the mould first.
Starting powder on top: the starting powder is spread on the main powder, ready for the flint igniter.
In waterlogged trenches, pump out the water and dry the conductors thoroughly before welding. Moisture trapped between cable strands often causes metal to spill from the top of the mould. If no torch is available, some welders fire one cartridge to dry a new mould, but heating with a torch saves powder.
A good exothermic weld is smooth, solid and fully fills the joint, with the conductors fused into the copper. Check each joint once it cools and the slag is removed, and cut out and re-weld any joint that fails. A visual check is usually enough on site, though some specifications also ask for X-ray checks on sample joints.
| What You See | Likely Cause | What to Do |
|---|---|---|
| Smooth, solid joint covering the conductors | Correct setup | Accept the joint |
| Pinholes or a porous surface | Moisture in the powder, mould or conductors | Dry everything, heat the mould and re-weld |
| Joint not fully filled | Cartridge too small, worn mould or metal leaking out | Use the cartridge on the mould label and check the clamp |
| Slag trapped in the joint | Dirty conductors or an uncleaned mould cavity | Clean the conductors and brush out the mould before each weld |
| Metal leaking at the conductor openings | Loose fit, worn openings or wrong conductor size | Check conductor sizes and replace a worn mould |
The right exothermic powder size is the cartridge weight marked on the mould label for that joint. Larger conductors, thicker strips and joints with more conductors need heavier cartridges. Too little powder gives an incomplete weld, and too much can overflow the mould.
| Example Joint | Typical Cartridge Weight |
|---|---|
| Small rod-to-rod or strip-to-strip joint (for example 25×2 mm strip) | about 115 g |
| 25×3 mm strip to 17.2 mm rod, vertical joint | about 150 g |
| 18 mm rod to 18 mm rod, straight joint | about 200 g |
| 50×6 mm strip to 50×6 mm strip, straight joint | about 250 g |
| 25×6 mm strip to 35 sq mm cable with 17.2 mm rod, T joint | about 300 g |
These are typical figures from mould listings. Always use the weight on your mould label.
Cartridges are also called shots or weld charges. Imported catalogues number them as #45, #65, #90, #115, #150, #200 or #250. The number is the weld metal weight in grams, so a #90 cartridge holds about 90 g.
SG Power's datasheet lists its own packing as sealed poly pouches of 200 g, 250 g, 500 g and 1 kg, packed as per requirement. Send the joint list rather than a bulk weight, and we'll pack each cartridge size against the moulds it belongs to.

To plan exothermic powder for a project, count the joints of each type and conductor size on the earthing drawing. Use one cartridge per weld, in the weight shown on that mould's label. Add about 5–10% spare cartridges for damp, damaged or failed welds.
| Example: 400 Rod-to-Cable Joints, One Size | Quantity |
|---|---|
| Powder cartridges (400 + about 8% spare) | about 430 |
| Steel discs | one per cartridge, usually packed with the powder |
| Starting powder | one dose per weld, usually packed with the powder |
| Moulds (about 50 welds each, plus a spare) | 9 |
Not sure which cartridge sizes you need? Share your earthing drawing, and we'll list the powder and moulds.
Exothermic powder joins copper to copper, copper to steel and copper bonded steel to copper, which covers most earthing joints. Common exothermic connections are cable to cable, cable to earth rod, strip to rod and cable to steel. Copper cables, copper and copper bonded strips, copper bonded earth rods and steel structures can all be welded.
| Joint | Suitable? | What to Check |
|---|---|---|
| Copper cable to copper cable | Yes | Clean, dry strands that fit the mould openings |
| Copper cable or strip to copper bonded rod | Yes | The rod diameter matches the mould |
| Copper to steel plate, pipe or structure | Yes | A surface mould and clean, bright steel |
| Copper cable to rebar (reinforcing bar) | Yes | A mould made for the rebar diameter and rust cleaned from the bar |
| Copper to GI (galvanised) strip | Yes, with care | Remove loose galvanising and dirt at the joint |
| Stainless steel | Only with a special weld metal | Confirm the materials with the supplier first |
| Cast iron | Only with a special weld metal | Confirm the materials with the supplier first |
| Brass and bronze fittings | Yes, with the right mould | Confirm the fitting material and size first |
| Aluminium conductors | Not with standard copper powder | Ask for a solution made for aluminium |
SG Power's copper bonded earthing rods come in 14, 17, 20 and 25 mm diameters. They pair with copper conductors, copper strips and GI strips in the same earthing system.
Exothermic powder must stay dry, because moisture causes porous, weak welds and can make molten metal spray. Keep packs sealed until use and store them in a dry, closed box away from heat and open flames. Powder kept sealed and dry keeps well for a long time.
| Do | Avoid |
|---|---|
| Keep packs sealed until the moment of use | Opening packs in rain or damp trenches |
| Store in a dry, closed box off the floor | Storing near heaters, flames or fuel |
| Keep each cartridge size labelled | Mixing loose powder from different packs |
| Use older stock first, and check the pack date | Using powder that is lumpy, damp or spilled |
| Carry only the day's cartridges to the work area | Leaving packs open on site overnight |
Older or slightly damp powder can be harder to ignite and gives poorer welds, so use older stock first. Exothermic powder does not ignite easily on its own; it needs the starting powder and a flint igniter. Even so, treat it as a high-temperature welding material and keep it away from children and untrained workers.
The exothermic powder price in India depends on the cartridge weight, quantity, packing and whether moulds and accessories are bought together. SG Power quotes powder on request after checking your joint list. This way, each cartridge size matches a mould on your drawing.
| What Changes the Price | Why It Matters |
|---|---|
| Cartridge weight | Heavier cartridges hold more copper oxide and aluminium |
| Quantity | Project orders with many identical joints cost less per cartridge |
| Packing | Individually sealed cartridges with discs and starting powder cost more than bulk powder |
| Kit items | Moulds, handle clamps, flint igniters and tools are priced separately |
| Delivery location | Freight and GST are added to the delivered cost |
| Item | SG Power Price (+ GST) |
|---|---|
| Exothermic welding powder cartridges (by weight) | Price on request |
| Graphite exothermic moulds | Price on request |
| Handle clamps, flint igniters and accessories | Price on request |
GST and freight are added to the delivered cost. * Prices are indicative. For the latest price, contact SG Power.
For a like-for-like comparison, ask every supplier to quote the cartridge weight, number of cartridges, discs, starting powder and GST on each line. Comparing the exothermic welding powder price per kg alone can mislead, because cartridge weights and included items differ.
Exothermic powder is used to make earthing joints designed under IEEE 80 for substations and IS 3043 for earthing practice in India. IEEE 837 sets qualification tests for permanent grounding connections. SG Power's moulds comply with IEEE 80 and NBC 2016, as stated in its catalogue.
| Standard | What It Covers |
|---|---|
| IEEE 80 | Safety in AC substation grounding, including conductor and joint sizing (2013 edition; a revision is in development) |
| IEEE 837 | Qualifying permanent connections: current-temperature cycling, freeze-thaw, corrosion, fault current and mechanical force tests (latest edition 2024) |
| IS 3043 | Indian code of practice for earthing |
| US NEC (NFPA 70) | Lists exothermic welding among accepted methods for connecting grounding and bonding conductors |
| NBC (SP 7) | National Building Code of India, including earthing and lightning protection of buildings |
| UL 467 | Grounding and bonding equipment. SG Power's exothermic welding powder datasheet names UL 467 as its test certificate. Testing to a standard is not the same as a UL listing, so if your specification asks for UL listed connections, raise it at the enquiry stage |
If your specification names a third-party listing, read our guide to UL listed exothermic powder manufacturers and share the requirement at the enquiry stage.
Exothermic powder is used wherever an earthing or bonding joint must stay permanent and low in resistance. Typical users are substations, power plants, solar parks, wind farms, telecom towers, railways, metro projects, refineries, data centres and high-rise buildings. Most of these joints are buried or exposed to weather for decades.
Substations and power plants: earth grid mesh, equipment tails and fence earthing
Solar and wind projects: array earthing, inverter and transformer earthing
Telecom towers and data centres: tower legs, ring earth and equipment bonding
Railways and metro: traction earthing, station earthing and signalling
Oil, gas and process plants: tank, pipe and structure earthing
Buildings and lightning protection: down conductors, ring earth, earth pits and lightning protection systems
See SG Power's lightning protection systems for down conductors, ring earth and earth pits.
Exothermic welding gives permanent, fused joints that do not loosen, but it also needs the right mould for each joint and dry working conditions. Knowing both sides helps engineers and buyers choose between welded joints and mechanical clamps for each earthing connection on a project.
| Advantages | Limitations |
|---|---|
| Fused joint that does not loosen or work free | The joint is permanent, so it must be cut to change |
| Joins dissimilar metals such as copper and steel | Each joint type and conductor size needs its own mould |
| Joint resistance stays stable over the life of the installation | Rain or damp conductors can spoil the weld |
| No electricity, gas or arc equipment needed on site | Each weld uses a new cartridge and steel disc |
| Portable kit suits trenches, towers and remote sites | Needs a trained welder and hot-work precautions |
| One handle clamp and flint igniter serve many moulds | Very thin parts can burn through, so they need a suitable mould |
SG Power's catalogue adds that, compared with bolting, brazing and conventional welding, the connection has higher mechanical strength, does not corrode with time and can bear about 1,000°C. This makes the corrosion-resistant, permanent low-resistance connection suitable for buried earth grids.
Exothermic powder is safe to use when the mould and conductors are dry, the clamp is locked and the welder stands to one side. The reaction produces molten copper, sparks and smoke for a few seconds. Plan each weld like any hot work.
Wear heat-resistant gloves, safety glasses and full-sleeve cotton clothing
Light the starting powder only with a flint igniter, never a lighter or match
Never weld near flammable gas or vapour; get a hot work permit on industrial sites
Keep water away from the powder, the mould and the joint, because water on molten metal turns to steam and sprays metal
Keep people clear of the mould until the reaction stops
Remove slag and hot discs safely, and let the joint cool before touching
Need powder, moulds and accessories for a project? We'll supply the complete kit, including tools and accessories.
To choose between exothermic powder manufacturers and suppliers, first check that the cartridge sizes match your moulds and joints. Then compare packing, consistency, technical support and whether moulds and accessories come from the same source. Ask each seller these questions:
Do you manufacture the powder, or resell it?
Which cartridge weights do you supply, and how are they marked?
Are starting powder and steel discs included with each cartridge?
How is the powder packed against moisture, and what date is on the pack?
Do you also supply moulds sized for the same cartridges?
Can you list the powder and moulds from our earthing drawing?
Do you supply handle clamps, flint igniters, brushes and gloves?
Can you train our welders and support the first joints on site?
For a deeper guide to buying powder, read how to choose an exothermic welding powder supplier.
Buyers choose SG Power as their exothermic welding powder manufacturer because it has made earthing and lightning protection products for 15+ years. It supplies welding powder together with graphite moulds, earth rods and conductors. So every cartridge, mould and conductor on a project fits together.
| Why SG Power | Detail |
|---|---|
| Experience | 15+ years of manufacturing |
| Factory | 7,000 sq m in Ghaziabad, 84 machines (17+ heavy machines), 250+ employees |
| Moulds | Comply with IEEE 80 and NBC 2016 (SG Power catalogue) |
| Company registrations | ISO 9001:2015 certified organisation; registered with MSME and SSI |
| Customers | 5,937+ customers in 319+ cities; service network in 127+ cities |
| Complete exothermic range | Exothermic welding system: powder, graphite moulds and tools and accessories |
| Complete earthing range | Earth electrodes, earthing rods, conductors and strips, earth pit covers and earth enhancing compound |
Learn more about SG Power.
SG Power's earthing, lightning protection and other electrical products are supplied to government bodies, PSUs and well-known companies across India. The organisations below appear with purchase orders in SG Power's catalogue:
| Sector | Organisations |
|---|---|
| Power and utilities | POWERGRID, NTPC, BHEL, NPCL, Adani, Reliance Power |
| Infrastructure and metro | L&T, Alstom, Indian Railways, Tata (smart city project), Welspun |
| Defence and government | DRDO, Indian Army, Indian Air Force, BSF, Ministry of Defence, Airports Authority of India |
| Industry, telecom and corporate | Hindalco, JK Cement, Jubilant, Bhushan Power, BSNL |
SG Power Products Pvt. Ltd. is rated 4.2 out of 5 by 132 buyers on IndiaMART and 4.4 out of 5 from 78 Google reviews (both checked October 2026). The IndiaMART rating covers all SG Power products, including earthing products, lightning arresters and servo stabilizers.
| Source | Rating | Number of Ratings |
|---|---|---|
| IndiaMART | 4.2 out of 5 | 132 |
| Google (Noida office) | 4.4 out of 5 | 78 |
SG Power Products Pvt. Ltd. is an exothermic powder manufacturer and supplier in Sector 62, Noida, with its own factory in Ghaziabad. It manufactures and supplies welding powder, moulds and earthing materials across Delhi NCR, Uttar Pradesh and the rest of India. Buyers in Delhi, Noida and Gurugram get local help with sizing.
Looking for the exothermic powder price in Noida? Ask for a quote with your joint list. If you searched for exothermic powder suppliers near me, our Sector 62 office and Ghaziabad factory serve the whole NCR. Buyers looking for an exothermic powder supplier near Delhi or an exothermic powder manufacturer near Noida can visit the office or request a quote.
SG Power is one of the exothermic powder suppliers in India, with customers in 319+ cities. These include Noida, Delhi, Gurugram, Ghaziabad, Faridabad, Kanpur, Hyderabad, Chennai, Pune, Ahmedabad, Coimbatore, Bengaluru, Kolkata, Mumbai, Lucknow and Jaipur.
SG Power Products Pvt. Ltd.
17th Floor, L-17-1714B, The Iconic Corenthum, Plot No. A-41, Sector 62, Noida, Gautam Buddha Nagar, Uttar Pradesh 201309
Phone: +91-8800803930 · Email: enquiry@sgpower.co.in · Contact page
Need exothermic powder for your site? Ask for a quote, and we'll confirm the cartridges, moulds and price.
These are the main facts about exothermic powder, in short form for quick reference:
What it is: a copper oxide and aluminium welding powder that produces molten copper to fuse earthing conductors.
How it works: an aluminothermic reaction in a graphite mould, reaching over 2,000°C in a few seconds, with no external power.
How much: one cartridge per weld, in the weight on the mould label, plus about 5–10% spare.
Sizes: typically 90 g to 300 g per joint; #90 means about 90 g.
SG Power packs: sealed poly pouches of 200 g, 250 g, 500 g and 1 kg, packed as per requirement.
Storage: sealed, dry and away from heat; damp powder gives porous welds.
Standards: used in earthing designed to IEEE 80 and IS 3043; IEEE 837 sets tests for permanent connections.
Not the same as: foundry riser powder or lime slaking powder, which are also sold as “exothermic powder”.
Maker: SG Power Products Pvt. Ltd., an exothermic powder manufacturer in Noida (Sector 62), with its own factory in Ghaziabad.
* Prices are indicative. For the latest price, contact SG Power.
* Prices are indicative. For the latest price, contact SG Power.
For the latest exothermic powder price, contact SG Power with your joint list, conductor sizes and quantities. Whether you need a few cartridges or powder for a complete earth grid, we'll match each cartridge weight to its mould and list the accessories you need.
The technical facts on this page come from SG Power's product catalogue and datasheet, and from published standards and references on exothermic welding. These sources let engineers, buyers and AI search tools check each fact. Standard editions change, so confirm the edition named in your project specification.
SG Power Products Pvt. Ltd., product catalogue (February 2026): company figures, mould compliance and joint merits
IEEE 80, Guide for Safety in AC Substation Grounding
IEEE 837-2024, Standard for Qualifying Permanent Connections Used in Substation Grounding
IS 3043, Code of Practice for Earthing (Bureau of Indian Standards)
National Building Code of India (Bureau of Indian Standards)
Standards are revised over time. IEEE 80-2013 is under revision and IEEE 837-2024 replaced the 2014 edition, so always confirm the edition named in your project specification before ordering.