CFR

Title 1 - General Provisions
Title 2 - Grants and Agreements
Title 3 - The President
Title 4 - Accounts
Title 5 - Administrative Personnel
Title 6 - Domestic Security
Title 7 - Agriculture
Title 8 - Aliens and Nationality
Title 9 - Animals and Animal Products
Title 10 - Energy
Title 11 - Federal Elections
Title 12 - Banks and Banking
Title 13 - Business Credit and Assistance
Title 14 - Aeronautics and Space
Title 15 - Commerce and Foreign Trade
Title 16 - Commercial Practices
Title 17 - Commodity and Securities Exchanges
Title 18 - Conservation of Power and Water Resources
Title 19 - Customs Duties
Title 20 - Employees' Benefits
Title 21 - Food and Drugs
Title 22 - Foreign Relations
Title 23 - Highways
Title 24 - Housing and Urban Development
Title 25 - Indians
Title 26 - Internal Revenue
Title 27 - Alcohol, Tobacco Products and Firearms
Title 28 - Judicial Administration
Title 29 - Labor
Title 30 - Mineral Resources
Title 31 - Money and Finance: Treasury
Title 32 - National Defense
Title 33 - Navigation and Navigable Waters
Title 34 - Education
Title 35 - Panama Canal
Title 36 - Parks, Forests, and Public Property
Title 37 - Patents, Trademarks, and Copyrights
Title 38 - Pensions, Bonuses, and Veterans' Relief
Title 39 - Postal Service
Title 40 - Protection of Environment
Title 41 - Public Contracts and Property Management
Title 42 - Public Health
Title 43 - Public Lands: Interior
Title 44 - Emergency Management and Assistance
Title 45 - Public Welfare
Title 46 - Shipping
Title 47 - Telecommunication
Title 48 - Federal Acquisition Regulations System
Title 49 - Transportation
Title 50 - Wildlife and Fisheries

90.329—Catalyst thermal stress test.

(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.

(b) Evaluation gas composition. (1) A synthetic exhaust gas mixture is used for evaluating the effect of thermal stress on catalyst conversion efficiency.

(2) The synthetic exhaust gas mixture must have the following composition:

Constituent	Volume percent	Parts per million
Carbon Monoxide	1
Oxygen	1.3
Carbon Dioxide	3.8
Water Vapor	10
Sulfer dioxide		20
Oxides of nitrogen		280
Hydrogen		3500
Hydrocarbon*		4000
Nitrogen = Balance
* Propylene/propane ratio = 2/1.

(c) Phase 2 engines. The catalyst thermal stress test is not required for engine families certified to the Phase 2 standards.

Code of Federal Regulations

[60 FR 34598, July 3, 1995, as amended at 64 FR 15243, Mar. 30, 1999]

Tips