zinc coating

Building codes require steel framing to have a fire resistance rating based on ASTM standard E119. Since United Metal Sections follows the ASTM standards for materials, coatings and manufacturing, we can confirm that our products meet the E119 standard when used, as recommended in the applications notes sections of this catalogue.

You may refer to Improving the Durability of Steel Framing section in this catalogue for additional information on this topic. 

With the adoption of heavier zinc coatings on galvanized steel, United Metal Sections products provide superior durability. This is particularly important in aggressive environments such as humid coastal regions. This makes United Metal Sections the preferred supplier of steel framing products in the Gulf region.

Durability

Used by United Metal Sections

(microns)

19.4

275

G90 Z275

Recommended by  ASTM

12.7 (microns)

180

G60 Z180

Notes

Zinc Thickness

g/ m2

Mass

Code

Coating

  

However, at United Metal Sections we are proud to exceed these requirements since we insist on making our profiles from G90 / Z275. This results in more durable quality products. The following table shows the United Metal Sections advantage:

According to the ASTM standards the minimum zinc coating requirements for load-bearing steel profiles is G60 / Z180.

18

0.047

1.2

19

0.039

1.0

23

0.028

0.60

25

0.024

0.50

26

0.020

0.45

Nearest U.S. Gauge Number

 (mm)      (inch)

Thickness However common gauges are: Most of United Metal Sections products can be manufactured in any gauge, as required by the customer. in this catalogue by a maximum of 0.05 mm. The actual steel thickness used in United Metal Sections profiles may differ from the thickness specified to ASTM A446-83, Grade A steel. United Metal Sections steel profiles have minimum yield strength of 230 Mpa (33,000 psi) according All United Metal Sections profiles conform to the finest steel standards accepted by the ASTM.   The following specifications apply to all our steel products presented in this catalogue unless otherwise indicated. Steel Specifications

The following specifications apply to all our steel products presented in this catalogue unless