Time pressure test: UN Series 1 / Series 2, Test 1 (c) (i) and 2 (c) (i))

Contact

Call us
+49 (0) 69 30530012 or write:

This form collects and processes your e-mail address, if you also specify your name and your company. By using this form, you consent to the storage and processing of your data through this website. You have read the privacy policy and agree.

To protect against spam, this form uses simple anti-spam questions.

What is the capital of Germany?

Time/pressure test: UN Series 1 / Series 2, Test 1 (c) (i) and 2 (c) (i))

The time/pressure test provides information on how quickly gas is released after ignition of the test substance under confinement and whether the resulting pressure leads to deflagration with explosive force.

The test apparatus consists of a small cylindrical autoclave with a capacity of approximately 17 mL and which is filled with 5 g of the test substance. At the lower end of the interior is the ignition system, consisting of an electric fusehead and a 13 mm x 13 mm square piece of primed cambric (linen fabric coated on both sides with a pyrotechnic composition of potassium nitrate/silicon/sulphur-free black powder).

For liquid samples, the primed cambric is wrapped and sealed with a plastic foil in such a way that the primed cambric is not in contact with the liquid substance.

The vessel is closed with a screw fitting containing a 0.2 mm thick aluminum bursting disc with a response pressure of approx. 25 bar. The ignition is triggered and the time/pressure curve is recorded. The test is also described as UN Test 1 (c) (i) and 2 (c) (i).

The time during which the pressure increased from 690 kPa to 2070 kPa is used for classification (see table).

Result Classification according to UN series 1 and 2
Time difference between 690 kPa and 2,070 kPa:
< 30 ms
Test 1 (c) “+” and Test 2 (c) is “+”
(“Yes, rapidly”)
Time difference between 690 kPa and 2,070 kPa:
≥ 30 ms
Test 1 (c) “+” and Test 2 (c) is “-”
(“Yes, slowly”)
2070 kPa not reached Test 1 (c) “-” und Test 2 (c) is “-”
(“No”)

Time-pressure test