What is Involved in a U.L. 181 Test?

28 April 2017 Kingspan Insulation Middle East

Our Kingspan KoolDuct and Kingspan PalDuct Phenolic products are UL Listed as a Class 1 Air Duct to standard for safety UL 181, but what does this test involve? Read below to find out.

The Test

1.      Test for Surface Burning Characteristics

This test measures how quickly and how far the flame spreads in the Steiner tunnel; values are calculated relative to red oak, which has an arbitrary rating of 100, and reinforced cement board, which has a rating of 0.

The test is conducted in a 25-foot tunnel, with pre-insulated panels — including the closure system - subject to the test.

 

2.       Flame Penetration Test

This test measures resistance to flame while the sample supports a static load of 2 pounds per square inch. The test was conducted in a furnace for 30 minutes.

 

3.       Burning Test

This test measures resistance to ignition and to progressive burning. The test utilises a Bunsen burner; Pre-insulated ductwork sections mounted in horizontal, vertical and 45-degree positions.

 

4.       Mold Growth and Humidity Test

This test measures resistance to mold growth and to the effects of high humidity. The samples are kept for 60 days in an atmosphere saturated with water vapour

 

5.       Low Temperature and High Temperature Test

This test measures resistance to the temperatures higher and lower than normal service.

 

6.       Puncture Test

This test measures resistance to puncture by a plunger. The test apparatus provides a free fall of a plunger onto the surface of the ductwork sections.

 

7.       Static Load Test

This test measures resistance to sagging, permanent deformation or damage.

Sections of ductwork are installed horizontally on supports. A static load is applied at the longitudinal center of the sample by suspending two 5-pound (2.26-kg) weights on a 1-inch (25.4-mm) wide pipe strap material for 24 hours.

 

8.       Impact Test

This test measures resistance to damage as a result of an impact. The test apparatus provides a free fall of a sand bag weighing 15 pounds (6.8 kg) onto the surface of the ductwork sections.

 

9.       Erosion Test

This test measures resistance to erosion when air is passed through typical ductwork sections at a velocity of two and one-half times the manufacturer’s rated velocity.

 

10.   Pressure and Collapse Tests

These tests measure resistance to positive and negative pressure.

Sections of ductwork are subject to internal air pressure of 2-1/2 times the manufacturer’s rated positive pressure and 2-1/2 times the manufacturer’s rated negative pressure.

 

11.   High Temperature and Humidity (as part of the Corrosion test)

This test measures resistance of the ductwork against damage and atmospheric corrosion.

Sections o ductwork are supported vertically in a closed chamber at a constant temperature of 40°C (104°F) and 100 percent relative humidity for 90 days.

 

12.   Corrosion Resistance Test

This test measures resistance to corrosion for iron and steel articles using the Standard Test Method for Weight [Mass] of Coating ANSI/ASTM A90.

 

13.   Leakage Test

This test measures ductwork air leakage

Sections of ductwork including joints are subject to an air pressure of 0.50-inch water column (124.5 Pa) maintained for a period of 1 hour. The total volume of air recorded from the time beginning with the establishment of the test pressure in the sample.

Our U.L. Listed Products

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