ERSIN SOLDER WIRES

Competitors' Single
Core Solder

Ersin Multicore
5-Core Solder

Competitors' Imitation
5-Core Solder

Multicore Solders Ltd. has employed its own unique extrusion process for over 40 years to guarantee flux continuity. It has earned an enviable reputation for this reliability that has never been challenged.

Firstly we use machines of our own design to minimise variations of temperature variations etc. during extrusion.

Secondly we are the only company in the world, to the best of our knowledge, that extrudes 5 truly separate cores of flux inside the solder wire.

Until 1967 we had patents covering our principle of extruding more than one core of flux. Most competitors still make single core. Some have tried to imitate our technology but we have proved that the shape of their flux cores (which sometimes collapse together at the centre as in the photo above) is due to flux being injected through a single nozzle having 5 holes in it. Such a crude imitation is no more technically reliable than a single cored solder.

The probability of all 5 cores being absent from Ersin Multicore 5-Core Solder is 5x4x3x2x1 = 120 times less than competitors' cored solder, even if the single core solder process was as closely controlled as Multicore's.

Faster Soldering

As the flux cores in Ersin Multicore 5-Core Solder Wire are closer to the circumference than in single core solders it is only necessary for the soldering iron to melt a thin wall of solder before the flux is melted and liberated, enhancing heat transfer and melting of further solder.

Purity of Metals and Accurate Alloying

We could save considerable sums of money in a year by using lower purity metals for solder alloys which, when subsequently assayed, would meet the B.S.I., American, DIN or JIS standards for the respective alloys. However our research has shown that many impurities present at levels permitted by these specifications reduce the mobility and wetting force of the molten solder thus reducing soldering speed, increasing the weight of solder used per joint and reducing the strength of the adhesion. It should be clear therefore that the cheapest solder per kg or lb conforming to a particular specification is not necessarily the most economical in terms of overall solder usage, productivity or reliability.

Quality Control

We could also save considerable sums of money in a year by dispensing with our Works Inspectors and Laboratory Q.C. staff. We have always aimed to supply products of guaranteed reliability. This cannot be achieved without process control and Q.C. testing.

All Ersin Multicore Solders are made with tested discrete batches of alloys extruded with tested discrete batches of fluxes. The batch numbers of alloy/flux appear on every reel and shipping carton. They also appear on a batch card included in every shipping carton which shows the personnel number of every person in our factory who handled the material through the various stages of its manufacture and packing. We keep retain samples of every batch of solder and flux for a considerable period and test records for ever. If you have already used the solder and thrown away the packaging, our computer can identify the batch number if you can quote our invoice number and require further technical information.

How do you prove the reliability and economy of Ersin Multicore Solders? The answer is simple. Use it for over 40 years like many of the world's leading manufacturers have done.

% Impurities permitted by major international specification in tin/lead solders are shown below compared with typical analysis of Ersin Multicore Solder 60/40 tin/lead solder.

Exclusive Products of Multicore Solders Ltd.
As is well known, the most common fluxing medium for use when soldering electrical connections is a high grade wood or gum rosin. Molten rosin wets both metals and metal oxide with ease, and on cooling leaves a hard protective, non corrosive flux residue on the joint. Unfortunately, though it wets metal oxides it is not, generally, sufficiently acidic to dissolve them. Flow of solder is thereby impeded. To overcome this difficulty, the range of Ersin fluxes was introduced; many years of research has permitted the extension of this range so that it is now possible to choose a flux to cope with almost any electrical soldering job, and to meet practically any public, government or industrial specification.

Ersin fluxes contain, dissolved in the rosin, a small proportion of complex substances ("activators"). The properties of these substances have been carefully chosen so that, on raising the flux to the soldering temperature, a small controlled quantity of a special reagent is liberated. This dissolves away the metal oxide and so promotes the flow of molten solder over the clean metal surface. Most of the reagent is either destroyed by combination with the metal oxide, or by the soldering heat. Any small quantity remaining in the flux is rendered innocuous by a re-combining with the activator, and so the flux residue is, like pure rosin, non corrosive, non sticky and impervious to moisture.

The activator is itself a wetting agent, and so it augments the wetting effect and reduction of surface tension produced by the rosin.

Any of the various heating methods (soldering iron, flame, oven, induction, etc.) may be used with Ersin Fluxes, provided the recommended soldering temperature is not exceeded. Care should be taken that the flux is not allowed the char. Where the temperature is raised rapidly (as with a soldering iron in electronic assembly) full benefit of the rapid heating can only be gained by using a very fast flux, such as Ersin 362, 366 or 370.

Ersin Multicore Solder is manufactured in thousands of combinations of different alloys, fluxes and flux contents.

Generally any combination can be manufactured to order, but certain standard specifications which are in regular demand are those found by experience to be suitable for most existing applications and are as follows:

Standard flux/alloy Ersin Multicore Solders
Ersin R3 and 360 fluxes are supplied in Grade KP (60/40) and Sn60 alloys respectively.
Ersin 381 flux is supplied in Sn60, Sn62 and Sn63 alloys.
Ersin 304 flux is supplied in Grade KP (60/40) alloy.
Ersin 370 flux is supplied in alloys conforming to U.S. Spec. QQ-S-571E.
Ersin 362 flux is supplied in B.S. 219 tin/lead alloys, pure tin, Savbit, H.M.P., L.M.P., 96S and TLC alloys.
Ersin 366 flux is supplied in 60/40, Savbit, 40/60, H.M.P., 20/80, 15/85, and 10/90 alloys.
Ersin 362B2 flux is supplied in Grade KP (60/40) alloy and Sn62 alloy.
Ersin 399 flux is supplied in 60/40 alloy.

The following table summarises the important features of the various standard Ersin fluxes. All are manufactured as 5-core solder with a nominal flux content of 3.0% w/w in 60/40 alloy. Equivalent volume in other alloys. Special flux can be supplied to order.

Tinning/Cleaning of soldering iron tips.
If soldering iron tips become oxidised as a result of being left switched on for long periods of time without use, they can easily be retinned using Multicore Tip Tinner/Cleaner TTC1. Please ask for details.