IEC 61482-1-2 Box Method


The box method uses a plaster box to focus a short arc toward a panel of fabric or a garment. There are two exposures: 4000 A, 0.5 second (Class 1) and 7000A, 0.5 second (Class 2). Higher energy levels are not addressed in this method. The requirements below must be met to pass testing, and the end result is a classification of 1 or 2.

Box Test Method Acceptance Criterion:

  • No melting through to the inner side
  • Afterflame less than or equal to 5 seconds
  • No hole larger than 5mm in any direction
  • All 8 value pairs in testing must be below the Stoll Curve

This method differs from the open-air arc method as the passing result is either Class 1 or Class 2, and there is no direct arc rating. The IEC 61482-2 Specification requires at least one of the two methods to be performed: open-air and/or box method.

Sample Requirements

Single layer test - Length: 3 meters or yards; Width: 1.5 meters or 60 inches
Multi-layer test - Length: 4 meters or yards; Width: 1.5 meters or 60 inches

Garment Testing to Box Method: 2 Finished Garments Size: XL (European) or Large (US)

If fabric is less than 1.5 meters or 60 inches wide, let us know the actual width and we will tell you how many meters or yards we will need.

Get Started

Please download and fill out the Test Form for fabric (XLS) or the Test Form for garments (XLS) and email it to Also, print the form and enclose it with your sample shipment.

Shipping Address

Attn: Hugh Hoagland
3018 Eastpoint Parkway
Louisville, KY 40223
United States


After your IEC 61482-1-2 Box Method testing is complete, we will send you an email with the results. Within a few weeks, we will send you another email with the full test report. You will receive a user name and password for our web site, You can log on to download test reports and the raw data, photos and videos from your tests.