Main Page
About ST
Location
Products
Prices
Contact Us!
Material Selection

Galvanized
What is Galvanized?

Hot-dipped galvanized steel starts out as plain carbon steel onto which a zinc coating has been applied. This coating is produced by a metallurgical reaction between the iron and the coating material (namely molten zinc). A series of hard abrasion resistant iron/zinc alloys are formed at the interface by means of a series of chemical treatments and these alloys are then over coated with relatively pure zinc as the steel is withdrawn from the galvanizing bath.

Why use Galvanized?

The galvanized coating provides excellent, cost-effective corrosion resistance in most above ground air ducting applications. When cleaned and prepared properly it can be painted and has excellent durability. It is also the benchmark material for HVAC applications.


Galvaneel / PaintGrip
What is Galvaneel?

Hot-dipped galvanized steel starts out as plain carbon steel onto which a zinc coating has been applied (See Galvanized). As the coated steel emerges from the galvanizing bath, all excess zinc is removed and the material is passed through an annealing furnace which heat-treats the material and converts the zinc coating into a zinc-iron alloy coating.

Why use Galvaneel?

The galvaneel coating provides excellent, cost-effective corrosion resistance in most above ground air ducting applications. In addition, the iron-rich zinc coating, which is dull-grey in appearance, provides an excellent surface for finish painting.


PCD / PVS
What is PCD?

PCD material is fabricated from prime, hot-dipped, galvanized steel (1) that has been cleaned and fire-treated. Next an epoxy primer (2) is bonded to both sides of the metal. Lastly, a 4 mil polyvinyl coating (3) is heat-fused onto one (4x1) or both (4x4) sides of the metal.

Why use PCD?

4x1 PCD products are fabricated with the polyvinyl coating to the outside, and are used for either underground systems, where protection from the soil is needed, or above ground where protection from the environment is required.

4x1 Reverse PCD products are fabricated with the polyvinyl coating to the inside, and are used for above groun fume exhaust systems where protection from corrosive materials is required.

4x4 PCD products are fabricated with the polyvinyl coating on both the inside and outside, and are used in applications where maximum protection is wanted both inside and outside.


Aluminum
What is Aluminum?

Aluminum and its alloys are lightweight, conductive, and corrosion resistant metals. While aluminum alloys are only 1/3 the density of iron alloys, their strength properties don't drop off as fast, allowing for a stronger part for the equivalent weight when compared to steel.

Why use Aluminum?

The passivation layer of Aluminum is too thin to be visible, which means the metal will maintain its shiny appearance. It is also impervious to air and water and , therefore, protects the metal beneath it. Further, when scratched, the layer quickly reforms, continuing protection of the base metal. Therefore, aluminum is ideal in environments which are normally corrosive to plain carbon or galvanized steel (Exception: environments involving chlorine, which easily attack the passive layer), such as fume or wet air exhaust.

In addition to the corrosion resistance, being a lightweight material makes aluminum products easier to hang and support, although being a softer material makes it prone to damage.

Lock-forming quality 3003 alloy is used primarily in HVAC applications.


Stainless Steel
What is Stainless Steel?

Stainless Steel alloys are ferrous (iron) alloys with a minimum of 10.5% chromium content. This chromium addition to the alloy results in a passive, corrosion resistant layer of chromium (III) oxide (CR2O3) when the alloy is exposed to oxygen.

Why use Stainless Steel?

The passivation layer of stainless steel is too thin to be visible, which means the metal will maintain its shiny appearance. It is also impervious to air and water and , therefore, protects the metal beneath it. Further, when scratched, the layer quickly reforms, continuing protection of the base metal. Therefore, stainless steel is ideal in environments which are normally corrosive to plain carbon or galvanized steel (Exception: environments involving chlorine, which easily attack the passive layer), such as fume or wet air exhaust. In addition, the ability to manufacture stainless in many finish qualities, including mirrored, makes stainless steel ideal from an aesthetic standpoint.

Typical alloys:

304
316L

Common finishes for stainless steel products are as follows:

2B - "Dull" Mill Finish
4B - "Brushed" Finish
8 - "Mirror" Finish