We welcome you to this edition of United News. Spring is here, and the precious metal markets continue to be aggressive, which certainly keeps all of us in the marketplace
on our heels. We bring you this newsletter in hopes of sharing with you some things in the industry that can assist you in your pursuit of business. If you see anything here
that brings questions, concerns, or possibilities to your world – please let us know. We are here to serve.
President and CEO
In this issue of United News …
Investment Casting - Air Bubble Defects
Air bubbles trapped in injection wax patterns can cause surface holes like defects in jewelry castings. The defect will be
a recessed cavity visible on the surface of the casting and will vary in size or shape. The holes are usually smooth inside. Air bubbles inside the wax patterns will
break during the final vacuum cycle of the investing process and investment will fill the hole. The casting will have a hole like defect due to the air bubbles in the wax
The most common causes of this defect are as follows:
- Air Pressure too high on wax pot: Check the air pressure settings on wax pot.
- Wax temperature
too hot or cold: Check the temperature on the wax pot.
- Wax pot low on wax: Try to keep the wax pot at least ½ full.
- Rubber mold held at wrong angle to nozzle: Hold
mold on same plain as nozzle.
- Lack of vent lines in rubber mold: Cut vent lines to release air trapped in mold.
- Moisture in compressor or air lines: Drain compressor daily,
use moisture traps on wax pots.
- Moisture in wax added to wax pot: Store wax in covered container in cool, dry place.
- Trapped air bubbles in wax pot: Adjust
temperature and stir wax to release air bubbles.
If you have additional questions about this process, please do not hesitate dropping us a note.
Refining Lots and Scrap Metal
It is very helpful to check the scrap material in your refining lots. Occasionally we run
across Titanium and Stainless steel rings and jewelry put in with gold scrap. This material adds weight to your scrap lot, not value. The melting points of titanium and stainless
steel items are very high and will not melt at normal gold scrap melting temperatures. This may slow down the processing time for your scrap lot as it takes extra time to remove
this non-precious material.
The "Conflict Minerals Law", also known as the Dodd–Frank Wall Street Reform and Consumer Protection Act, was passed by the US Senate on May 20, 2010 and signed by President
Barack Obama on July 21, 2010. All products manufactured and sold by United PMR, Inc. are completely FREE of the four minerals namely - Columbite-Tantalite, Cassiterite, Wolframite,
Mined Gold as well as any pure metals extracted from these minerals which are sourced from conflict areas as defined in the Conflict Minerals Law. United is presently undergoing
a third party certification (SCS) which officially certifies our organization to be complaint with the Conflict Minerals Law.
Products and Services to Consider
We at United have a variety of timely products available to help in your manufacturing and repair industry challenges.
- Karat Sterling™ - Suitable for casting, Karat Sterling™ is a high tarnish resistant "gold based sterling silver" ready to use grain. Similar in appearance to white gold,
the alloy offers high fluidity for casting filigree or stone-in-place designs, tarnish-resistance, and no fire-scale. Due to the alloy's improved whiteness, jewelry
manufactured with this alloy exhibits a high surface luster.
- Champagne Pink – Champagne pink is available as a ready-to-cast grain for 10K, 14K & 18K castings or fabrication. This alloy in various karat - offers a subtle pink color,
closely resembling the tone of the sparkling wine -Champagne. This unique pink alloy seems to be very appealing to jewelry manufacturers specializing in bridal collections with