Perforated and Expanded Metal Updates
Even though
perforated and expanded metals have been used in construction for over
100 years, architects, designers and builders continue to find new
applications for them and their usage is growing. Here are nine things
you should know about these two building components.To get more news
about expanded mesh, you can visit boegger.net official website.
1. NEW APPLICATIONS
Recently,
there has been increased demand in both architectural and security
applications for expanded metal. “The advantage of expanded metal for
security applications is increased strength and difficulty breaching
compared to chain link,” says Drew Bahner, vice chairman of Expanded
Metal Manufacturers Association (EMMA) and general manager of Expanded
Solutions LLC, Oklahoma City. “It also works well behind drywall to
prevent business-tobusiness building breaches.”
Bill Phillips
Jr., president/COO of Niles International, Niles, Ohio, says expanded
metal has new applications in and is quite functional for absorbing
specific sound frequencies, EMI/RFI and microwave containment, control
of design, control of lighting, control of ventilation, control of sound
and the fabricating/structural considerations of open area. “Other
unique applications for expanded metal are in foils with lightning
strike protection, fuel cells, filtration and medical,” he adds.
From
a design perspective, perforated metals are becoming more popular in
parking garage applications, for sunshading elements and accents with
backlighting, according to Jim Bush, vice president of sales, ATAS
International Inc., Allentown, Pa. “In some cases, corporate images with
customdesigned perforations are also requested,” he says.
2. SUSTAINABLE ISSUES
Some
believe expanded metal is the greenest type of open area metal on the
market today. While it looks like expanded metal is punched, it is
actually slit and stretched in one motion and there is no scrap
generated in the process. A typical expanded product expands the raw
material more than 300 percent; however, depending on the product, this
can vary. “When perforating a 4-foot by 8-foot sheet, you get a 4-foot
by 8-foot sheet of perforated along with all of the punched scrap,”
Bahner says. “Both expanded metal and perforated metal are cold
processes utilizing mechanical energy and dies and require no welding.
Yet another type of open area metal would be metal bar grating, which,
like expanded metal, doesn’t create scrap in its process. However, metal
bar grating does use a significant amount of energy since it is a
welded product. The lower environmental impact also generally translates
into a lower overall cost.”
3. MANY MATERIAL CHOICES
Many
different metals can be perforated. Bush contends aluminum is the
desired material due to its inherent corrosion-resistant properties. He
feels this is especially true with exposed cut edges at the holes or
penetration locations. Bahner agrees that aluminum is popular because it
doesn’t rust and doesn’t require paint.
Expanded mesh is
available in most any ductile metal, alloy, plastic and polymer.
Phillips says common materials expanded by his company are aluminum,
brass, bronze, copper, carbon steel, nickel alloys, platinum, silver,
stainless steel and titanium.
4. COATINGS
Designers are
further stretching the boundaries of aluminum by adding colors with an
anodizing coating. Expanded metal is also available in original mill
finish, powder coating and polyvinylidene fluoride (PVDF) finishes.
Phillips says coatings available in secondary treatments completed after
the expansion process include Corten, hot-dip galvanizing, and painting
and plastic coatings. Bush says for materials other than
corrosion-resistant materials such as metallic-coated steels, it may be
desirable to post paint the material after perforating because the
primer and paint coating can provide some element of corrosion
protection at the cut edges of the perforations.
The Wall