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Technical Questions


Aluminum Reaction With Cement

When aluminum components come into contact with cement or lime mortar, exposed aluminum surfaces should be painted with heavy bodied bituminous paint, water-white methacrylate lacquer or zinc chromate.

What are the differences among welding, brazing and soldering of aluminum?

Aluminum Standards and Data provides definitions for welding and brazing:  Welding is the "joining of two or more pieces of aluminum by applying heat or pressure, or both, with or without filler metal to produce a localized union through fusion or recrystallization across the interface".  Brazing...more

What is the difference between Pipe and Tube?

IPS stands for iron pipe size – a standard that was originally developed for fluid transfer but has also become the standard for designating handrail sections in all alloys.  There is often confusion as to which size product the customer actually needs – Pipe Size or OD Tubing Size.   Keep in mind...more

Mechanical Properties of Various Alloys

View Allowable Stress, Minimum Yield and Modulus of Elasticity for Aluminum, Bronze, Stainless Steel and Steel.  MaterialAllowable Stress  (psi)  Minimum Yield  (psi)  Modulus of Elasticity  (psi)  Aluminum, 6061-T621,00035,00010,000,000Aluminum, 6061-T6 (pipe)24,00035,00010,000,000Aluminum,...more

What is the difference between "wrought" and cast iron?

In contemporary useage, Wrought iron is metal that is "worked," often on an anvil. Using the skills of a blacksmith, the metal is heated in a forge and hammered to shape. A metalsmith can either forge the metal by hand over an anvil or by using a modern power hammer. Wrought Iron also is a term...more

Clearing the Confusion Over Wrought Iron

One of the most confusing terms in the ornamental metals business is the phrase "wrought iron." However, the confusion is understandable since even dictionaries cannot agree on a single definition The first thing to clear up is the spelling. Many consumers spell the metal "rod iron" or "rot iron...more

NFPA Code brackets

2003 ruling NFPA handrails need to have a minimum of a 2-1/4” clearance The 1770 bracket will meet the NFPA codes if used with 1-1/2” OD Tubing. At the present time, the only states that I know to have adopted NFPA are Vermont and New Hampshire. We have redesigned two brackets to meet this code:...more