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24-7068-6401

Organic Cored Wire For Lead-bearing and Lead-free alloys

Unspecified 

331

Application Notes

Availability:

Kester 331 is available in a wide variety of alloys, wire diameters and flux percentages. For most applications,

Sn63Pb37 or Sn96.5Ag3.0Cu0.5 is used. Consult the alloy temperature chart in Kester’s product catalog

for a comprehensive alloy list. The standard wire diameter for most applications is 1.00mm (0.031in). Wire

diameters range from 0.40 - 1.57mm (0.015 to 0.062in). A "Standard Wire Diameters" chart is included in

Kester’s product catalog. The amount of flux in the wire dictates the ease of soldering for an application.

For most applications, core 58 and 66 (2.2% and 3.3% flux by weight, respectively) are recommended. Core

size 50 (1.1% flux by weight) is also available. Kester 331 is packaged on spools of different sizes to

accommodate a variety of applications.

Process Considerations:

Solder iron tip temperatures are most commonly between 315-371°C (600-700°F) for Sn63Pb37 and

Sn62Pb36Ag02 alloys and 371-427°C (700-800°F) for lead-free alloys. Heat both the land area and component

lead to be soldered with the iron prior to adding Kester 331 cored wire. Apply the solder wire to the land area

or component lead. Do not apply the wire directly to the soldering iron tip. If needed, Kester 2331-ZX organ-

ic flux may be used as a compatible liquid flux to aid in reworking soldered joints. Kester 2331-ZX is also

available in Flux-Pens® for optimum board cleanliness.

Cleaning:

The 331 flux residue is conductive and may cause corrosion of metal parts over time. Soldered samples left

up to 48 hours in a simulated production environment, without removing the flux, showed no evidence of the

flux residue having any corrosive properties. Kester 331 Organic Flux has the advantage over many

competitive water-soluble flux formulations in that the residue is easily and completely removed with plain

water. No neutralizers. saponifiers or detergents are necessary to completely solubilize the residue. Softened

tap water or deionized water is recommended for high reliability. Use of hard or high mineral content tap

water will lower ionic cleanliness measurements.

Storage, Handling, and Shelf Life:

Storage must be in a dry, non-corrosive environment. The surface may lose its shine and appear a dull

shade of grey. This is a surface phenomena and is not detrimental to product functionality. Flux cored solder

wire has a limited shelf life determined by the alloy used in the wire. For alloys containing > 70% lead, the

shelf life is two years from date of manufacture. Other alloys have a shelf life of three years from date of

manufacture.

Health & Safety:

This product, during handling or use, may be hazardous to health or the environment. Read the Material

Safety Data Sheet and warning label before using this product.

World Headquarters: 800 West Thorndale Avenue, Itasca, Illinois, 60143 USA

Phone: (+1) 630 616-4000 • Email: customerservice@kester.com • Website: www.kester.com

Asia Pacific Headquarters

500 Chai Chee Lane

Singapore 469024

(+65) 6449-1133

customerservice@kester.com.sg

European Headquarters

Zum Plom 5

08541 Neuensalz

Germany

(+49) 3741 4233-0

customerservice@kester-eu.com

Japanese Headquarters

20-11 Yokokawa 2-Chome

Sumida-Ku

Tokyo 130-0003 Japan

(+81) 3-3624-5351

jpsales@kester.com.sg

The data recommendations presented are based on tests, which we consider reliable. Because Kester has no control over the conditions of use, we disclaim any responsibility connected with the

use of any of our products or the information presented. We advise that all chemical products be used only by or under the direction of technically qualified personnel who are aware of the

potential hazards involved and the necessity for reasonable care in their handling. The technical information contained herein is consistent with the properties of this material but should not be used

in the preparation of specifications as it is intended for reference only. For assistance in preparing specifications, please contact your local Kester office for details.

Rev: 2317Feb11

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