Constantan Wire Manufacturer,Supplier and Exporter in India
Product Code : EL-SLE-4754
Jlab Export is a leading Constantan Wire Manufacturer,and suppliers in India
Constantan Wire (code EL-SLE-4754) is a nickel–copper alloy resistance wire, sold in 75 g rolls, used to wind resistance coils and for resistance and resistivity experiments in school and college physics labs. Its low temperature coefficient means the resistance stays nearly constant as the wire warms, which is why it is preferred over copper for these jobs. It is made by Jain Laboratory Instruments Pvt Ltd (JLab) at its works in Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Material | Constantan — an alloy of nickel and copper |
| Key property | Low temperature coefficient of resistance |
| Wire gauges | SWG 24, SWG 26, SWG 28, SWG 30 and SWG 32 |
| Roll weight | 75 g per roll |
| Listed use | Resistance coils |
| Quality check | Each roll is visually inspected before dispatch |
| Pack quantity | One 75 g roll in the gauge you choose |
| Minimum order quantity | 10 units |
| Dispatch time | Usually 7–10 working days |
| Product code | EL-SLE-4754 |
| Manufacturer | Jain Laboratory Instruments Pvt Ltd (JLab) — OEM |
| Country of origin | India (made in Ambala, Haryana) |
How Does It Compare with JLab Copper Wire?
| Wire | Alloy or metal | Roll weight | Gauges | Typical job |
|---|---|---|---|---|
| This constantan wire (EL-SLE-4754) | Nickel–copper alloy, low temperature coefficient | 75 g | SWG 24, 26, 28, 30 and 32 | Resistance coils and resistance experiments |
| Copper Wire | Enamelled copper | 75 g | SWG 24, 26, 28, 30 and 32 | Transformer, inductor and electromagnet windings |
Pick constantan when the wire is meant to provide resistance — a home-made resistance coil or a length of wire whose resistivity students will measure. Pick copper when the wire only has to carry current to a coil or winding with as little loss as possible.
What Is Constantan Wire Used For?
Constantan has a much higher resistance than copper and, more importantly, a resistance that hardly changes with temperature — the property that gives the alloy its name. That makes it the usual choice for resistance coils and for experiments where readings must not drift as current warms the wire: finding the resistivity of a wire with a metre bridge in class 12 physics, checking the laws of resistances in series and parallel, and Ohm’s law practicals. Joined to copper it also forms a simple thermocouple for demonstrating the thermoelectric effect. Students should straighten the wire without kinking it, measure the length used carefully, and clean the ends before clamping them in terminals so contact resistance does not upset the readings.
What to Specify When Ordering
- Gauge — SWG 24, 26, 28, 30 or 32 (higher numbers are thinner and give more resistance per metre); state the number of rolls for each gauge.
- Quantity — the minimum order is 10 units (rolls).
- Whether you need bare or insulated wire, or a minimum length per roll — the listing does not state these, so mention them in your enquiry.
- Matching apparatus — a metre bridge, rheostats or copper winding wire can go on the same quotation.
Frequently Asked Questions
What is constantan wire made of?
It is an alloy of nickel and copper. The alloy is chosen because its resistance changes very little with temperature, unlike pure copper.
Which gauges are available, and how much is on a roll?
SWG 24, SWG 26, SWG 28, SWG 30 and SWG 32, each in a 75 g roll. The length on a roll is not listed and depends on the gauge, so ask JLab if your practical needs a set length.
Why use constantan rather than copper for a resistance coil?
Constantan gives far more resistance for the same length and keeps almost the same value as it warms, so a coil wound from it is compact and its resistance stays steady during an experiment.
Can it be used in a metre bridge resistivity experiment?
Yes — a length of constantan wire is a common “unknown” wire for the class 12 experiment to find resistivity with a metre bridge. Measure the length you connect and the wire diameter, then calculate the resistivity from the resistance you find.
Is the wire insulated?
The listing does not say. If your use needs bare wire or an enamelled finish, state that in the enquiry and JLab will confirm what it can supply.
Who manufactures this constantan wire?
JLab — Jain Laboratory Instruments Pvt Ltd — makes it at its works in Ambala, Haryana, India, and quotes for it directly as the manufacturer.
OEM Manufacturer
Behind the JLab name is Jain Laboratory Instruments Pvt Ltd, a manufacturer of school, college and university lab equipment in India, incorporated in 2017 and based on Hargolal Road, Ambala, Haryana. This resistance wire comes from JLab’s own works, not from a reseller, so schools, colleges, dealers and importers buy it factory-direct, every roll is visually inspected before it ships, and repeat orders are handled by the manufacturer. JLab exports worldwide and ships to buyers in every region — for example Angola in Central Africa, the UAE in the Middle East, Belize in Central America and the Caribbean, Canada in North America and Tanzania in East Africa. Information for tender buyers is on the JLab lab tenders page.
Resistance Experiment Apparatus
- Copper Wire — enamelled copper winding wire in the same gauges and roll weight.
- Meter Bridge and Pencil Jockey — a metre bridge with constantan wire along a wooden metre scale, for finding unknown resistances.
- Rheostats (Continuous Constantan Type) — sliding-contact rheostats wound with constantan resistance wire.
- Potentiometer — a wire potentiometer with pencil jockey for measuring potential and cell EMF.
Find more physics lab equipment for schools in the School Lab Equipment range.
Request a Quote
Quotes come direct from the manufacturer. Use the Add To Cart enquiry button on this page, or send the gauges and number of rolls (minimum 10 units), whether you need bare or insulated wire, and your delivery city or port through the contact page.
Last updated: 4 October 2026
