40 CFR 90.329 - Catalyst thermal stress test.
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(a) Oven characteristics. The oven used for thermally stressing the test catalyst must be capable of maintaining a temperature of 500 ±5 °C and 1000 ±10 °C.
(1) A synthetic exhaust gas mixture is used for evaluating the effect of thermal stress on catalyst conversion efficiency.
|Constituent||Volume percent||Parts per million|
|* Propylene/propane ratio = 2/1.|
|Oxides of nitrogen||280|
|Nitrogen = Balance|
(c) Phase 2 engines. The catalyst thermal stress test is not required for engine families certified to the Phase 2 standards.
[60 FR 34598, July 3, 1995, as amended at 64 FR 15243, Mar. 30, 1999]
Title 40 published on 2013-07-01
no entries appear in the Federal Register after this date.