Ask X3What does 49 CFR 178.818 (Tear test) require?
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Based on 49 CFR 178.818, the tear test requires the following steps and criteria for flexible Intermediate Bulk Containers (IBCs):
1. Preparation: Fill the flexible IBC to at least 95 percent of its capacity and to its maximum net mass, ensuring the load is evenly distributed.
2. The Cut: Place the IBC on the ground and make a 100-mm (4-inch) knife score that completely penetrates the wall on a wide face. This cut must be made at a 45° angle to the principal axis of the IBC, halfway between the bottom surface and the top level of the contents.
3. Superimposed Load Test: Apply a uniformly distributed superimposed load equivalent to twice the maximum net mass on the IBC for at least five minutes.
4. Lifting Test: If the IBC is designed to be lifted from the top or the side, remove the superimposed load, lift the IBC clear of the floor, and hold it in that position for five minutes.
5. Passing Criterion: The IBC passes the tear test (outlined in 49 CFR 178.818) only if the initial cut does not propagate more than 25 percent of its original length.