Skip to Content

4047 & 4032 Aluminum Silicon Brazing Alloy

Aluminum Overview

Eagle Alloys Corporation (EAC) is the leading global supplier of 4047 Aluminum Alloy and 4032 Aluminum Alloy in castings, forgings, billets, foil, fin, coil, ribbon, strip, sheet, plate, wire, rod, bar, tubing, rings, blanks, and custom sizes. A wide variety of sizes are available from stock with same or next day shipping.  If Eagle Alloys does not have your exact requirement in stock, we can offer competitive pricing with short lead times. Below are most of EAC common stock sizes available for immediate shipping.

Eagle Alloys Corporation is an ISO Certified Corporation and have been supply the highest quality Aluminum for over 35 years.

Specifications & Applications

Aluminum 4032

Aluminum 4032

Aluminum 4047

Aluminum 4047


About Aluminum Metal (Al) and Aluminum Alloys

Aluminum is a chemical element with symbol Al and atomic number 13. It is a silvery-white, soft, nonmagnetic and ductile metal in the boron group. By mass, aluminum makes up about 8% of the Earth’s crust; it is the third most abundant element after oxygen and silicon and the most abundant metal in the crust, though it is less common in the mantle below. The chief ore of aluminum is bauxite. Aluminum metal is so chemically reactive that native specimens are rare and limited to extreme reducing environments. Instead, it is found combined in over 270 different minerals.

Aluminum is remarkable for its low density and its ability to resist corrosion through the phenomenon of passivization. Aluminum and its alloys are vital to the aerospace industry and important in transportation and building industries, such as building facades and window frames. The oxides and sulfates are the most useful compounds of aluminum.

How is Aluminum Used?

Laser welded covers for Microwave Integrated Circuits and similar devices have been fabricated from 4047 aluminum alloy due to the high silicon content (11.5%) which provides ductile welds with most common aluminum housing alloys. Covers with dimensions of 2” in length and smaller are best fabricated from 4047 aluminum alloy.

We recommend the use of 4032 aluminum alloy for covers larger than 3” because the 4032 alloys has better creep characteristics than 4047 aluminum when material is stressed at temperature above 80 degree C.

4032 Aluminum may be viewed as either a heat treatable type 4047 or a laser weldable type 6061. The 4032 material compositions contain 12.2% silicon to provide welding characteristics. In addition, magnesium, nickel, and copper content allow the material to be heat treated to yield strength levels comparable to 6061-T6.

The laser welding characteristics of 4047 and 4032 aluminum alloys are similar and the laser weld schedules may effectively be interchanged.

We will be glad to answer any questions regarding 4047 and 4032 Aluminum.

STATEMENT OF LIABILITY - DISCLAIMER Any suggestion of product applications or results is given without representation or warranty, either expressed or implied. Without exception or limitation, there are no warranties of merchantability or of fitness for particular purpose or application. The user must fully evaluate every process and application in all aspects, including suitability, compliance with applicable law and non-infringement of the rights of others Eagle Alloys Corporation and its affiliates shall have no liability in respect thereof.


Contact Eagle Alloys

Toll Free: 800.237.9012
Local: 423.586.8738
Fax: 423.586.7456


Company Headquarters:
178 West Park Court
Talbott, TN 37877

Or fill out the form below:

"*" indicates required fields

Drop files here or
Max. file size: 32 MB.
    *Hold ctrl to select multiple files.
    Do you want to receive future emails?*
    This field is for validation purposes and should be left unchanged.

    This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply