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Environmental concerns dominate division activities.

Environmental Concerns Dominate Division Activities

Environmental concerns dominate the research activities of this division. An entire technical session was devoted to these issues at Castexpo '90 in Detroit earlier this year.

Research work done at the University of Michigan on lead leachate from waste sand was summarized. An update on OSHA's ruling concering airborne lead in brass and bronze foundries was also presented.

Additional technical papers on lead leachate from waste sand were presented a year earlier at the Casting Congress in San Antonio, as was a research project performed at the University of Alabama on airborne lead. This work concentrated on lead emissions from various alloys and the use of cover fluxes to reduce the emissions. Papers resulting from this research work are included in AFS Transactions.

A subject of considerable interest now concerns lead in potable water. Efforst to develop standards to control lead in copper alloy plumbing fittings have been led by the National Sanitation Foundation (NSF) and the Environmental Protection Agency (EPA).

Many companies in the plumbing industry have formed a Copper Alloy Task Force to research the lead problem. Working with the Brass and Bronze Division of AFS, and the Copper Development Association (CDA), the group began by investigating nine alloys for castability, machinability, corrosion resistance, solderability and polishing ability. Research funding was provided by the member foundries, CDA and AFS.

A progress report was presented in Detroit during the division's session on environmental concerns. Current research indicates that a silicon bronze alloy offers the most potential.

The task force is working with NSF and EPA to prove that existing alloys pose no threat and are acceptable for continued use in plumbing fixtures.

The division's Permanent Mold Committee has been revitalized and has been assigned to act on the following:

* set new permanent mold mechanical property standards and promote their adoption by ASTM and CDA;

* establish a marketing effort aimed at application and design engineers;

* sponsor the creation of a manual on permanent mold casting and design.

Since presenting technical papers on pressurized gating for red brass aloys and effective gating and risering for aluminum bronze production castings, the Gating and Risering Committee has begun research on the effects of phosphorus on the fluidity of red brass alloys.

This work began a few years ago, using a typical fluidity spiral, now replaced with a pattern they developed because of inconsistencies in initial trials. Tests have been conducted at various foundries and the CMI lab using green sand and no-bake molds. Early data indicated that process variables affected the results, therefore, tests have been run at two foundries with automatic molding and pouring and the results will be presented in a technical paper next year.

Plans for this committee include reports on the use of filters in gating copper-base alloys and on the gating and risering of silicon bronze alloys.

The division had booth space at the American Society of Plumbing Engineers Exposition in Cincinnati, Nov. 5-7, 1990, a first for the division. The booth was sponsored by the Brass and Bronze Division of AFS along with ten foundries providing the funding and examples of copper-base alloy plumbing castings.

Advantages of brass and bronze alloy castings also were discussed and division literature was distributed.
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Title Annotation:American Foundrymen's Society Brass and Bronze Division
Author:Smith, Geary R.
Publication:Modern Casting
Date:Jan 1, 1991
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