./.WORLD TRADE
ORGANIZATIONG/TBT/Notif.99.90
12 March 1999
(99-0989)
Committee on Technical Barriers to Trade
NOTIFICATION
The following notification is being circulated in accordance with Article 10.6.
1. Member to Agreement notifying:  THAILAND
If applicable, name of local government involved (Articles 3.2 and 7.2):           
2. Agency responsible:  Thai Industrial Standards Institute, Ministry of Industry
Agency or authority designated to handle comments regarding the notification shall be
indicated if different from above:           
3. Notified under Article 2.9.2 [ X ], 2.10.1 [    ], 5.6.2 [    ], 5.7.1 [   ], other:           
4. Products covered (HS or CCCN where applicable, otherwise national tariff heading.
ICS numbers may be provided in addition, where applicable):  Motor cycles and moped(43.140)
5. Title, number of pages and language(s) of the notified document:  Draft Ministerial
No… (B.E.2542) Issued under the Industrial Product Standard Act B.E.2511 Amending
Compulsory Standard TIS 341-2528(1985) Motorcycle Exhaust Muffler (3 pages, available
in Thai language)
6. Description of content:  The Thai Industrial Standards Institute (TISI) has proposed to
amend the compulsory Standard TIS 341-2528(1985) Motorcycle Exhaust Muffler which:
- Covers exhaust mufflers for 2-stroke engine and 4-stroke engine in motorcycle;- specifies materials, i.e. steel, galvanized steel, aluminium-plated steel and stainless
steel;
- classifies the steel product into two types i.e. Type 1: part that emits the flow of
exhaust gases and part that reduces exhaust noise level are assembled as an integral
component and Type 2: part that emits the flow of exhaust gases and part that
reduces exhaust noise level are visibly two separate components;
- prescribes requirements for materials (e.g. thickness, corrosion resistance, adhesive
strength of plating surface), components, surface plating, maximum noise level,
leakage of exhaust muffler.  Includes marking, labelling, sampling and criteria for
conformity testing.G/TBT/Notif.99.90
Page 2
6. Description of content (cont'd.):
The principal changes are as follows:
1. Amending table 1, Thickness of materials
2. Amending maximum noise level:
- not more than 95 decibel A for motorcycle having cylinder capacity 50 cm3
to 125 cm3;
- not more then 99 decibel A for motorcycle having cylinder capacity
exceeding 125 cm3.
3. Amending maximum leakage to not exceeding 900 cm3/sec.
7. Objective and rationale, including the nature of urgent problems where applicable:
Environmental protection
8. Relevant documents:
1. TIS 341-2528 (1985) Motorcycle Exhaust Muffler (15 pages: A5, available in Thai
language).
2. ISO 5130-1982 Measurement of Noise Emitted by Stationary Road Vehicles -
Survey method.
3. MIL-M-52590-1983 Military Specification:  Mufflers, Exhaust, Internal
Combustion Engine, General Purpose.
4. Will appear in the Government Gazette when adopted.
9. Proposed date of adoption:
Proposed date of entry into force: } To be determined
10. Final date for comments:  16 April 1999
11. Texts available from:  National enquiry point [ X ] or address, e-mail and telefax number of
the other body:           