EPA Method 1050

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EPA Method 1050:
TEST METHODS TO DETERMINE SUBSTANCES LIKELY TO SPONTANEOUSLY COMBUST

Summary:
Test Method A is performed to determine if a solid ignites within five minutes of coming in contact with air at ambient room temperature. A representative sample of waste is dropped from a height of one meter onto a non-combustible surface, the waste is observed to determine whether the waste ignites while dropping or within five minutes of settling. If ignition is not observed, this test is repeated five times or until a positive result is obtained, whichever occurs first. The results of this test may be used to classify a solid waste as having pyrophoric properties. Test Method B consists of a two part procedure that may be used to determine if a liquid waste ignites when exposed to air at ambient temperature. In the preliminary test, a representative liquid sample is added to an inert carrier in a porcelain cup at ambient temperature and the mixture is observed to determine if the liquid ignites within five minutes. If ignition is not observed, this test is repeated five times or until a positive result is obtained. If no ignition occurs, the liquid waste is then delivered onto a Whatman filter paper to determine whether ignition or charring occurs on the filter paper within five minutes. If ignition or charring is not observed, this part of the test is repeated two times or until a positive result is obtained, whichever occurs first. The results of this test may be used to classify liquids as having pyrophoric properties. Test Method C may be performed to determine whether a solid waste exhibits self-heating properties. This test procedure is limited to granular solids, pastes, and other solid wastes that can be reduced in particle size to fit into a 25-mm or 100-mm stainless steel cube. Solid wastes that show pyrophoric properties as demonstrated by Test Method A must not be evaluated by this test.

Scope:
This method provides test procedures which may be used to evaluate and categorize liquid and solid wastes that are likely to spontaneously combust. This method provides three separate test procedures for evaluating the spontaneous combustion properties of solid and liquid wastes.

Report Number:
SW-846 www