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TL52498_EN_2006-07-01

Klass.-Nr./Class. No. 55614

July 2006

Glass/Mineral Fiber Insulating Material for Exhaust Systems, Filaments

Material Requirements 3 Types: A, B, C Konzernnorm Descriptors: glass fiber insulating material, mineral fiber insulating material, exhaust system, muffler, exhaust system, filament, damping

TL 52498

The English translation is believed to be accurate.In case of discrepancies the German version shall govern.

Changes The following changes have been made as compared to Technical Supply Specification TL 52498: 2003-04:


Table 1, no. 3.1.3, Type A: value increased

Previous issues 2001-10, 2003-04 1
Numerical notation according to ISO practice (see VW 01000).

Scope

The damping material specified in this standard is used for sound absorption in front, middle and rear mufflers of motor vehicle exhaust systems. 2 Description

Glass fiber insulating material according to TL 52498-A or TL 52498-C. Mineral fiber insulating material according to TL 52498-B. 3 3.1 Requirements General requirements

Approval of first supply and changes acc. to Volkswagen standard VW 01155. Avoidance of hazardous substances acc. to VW 91101. Fibrous material as specified in this standard is classified as posing "no danger to health" with respect to the Hazardous Substances Regulation valid at the time of issue. This classification arises from the fiber sizes. For complete testing, 10 test specimens in finished form or 1 kg of fibrous material (in case of bobbin goods) are/is required. Additional test material shall be made available upon request. The material is subject to technical engineering approval (BMG). Other tests, such as function tests and road trials are required for an evaluation. 3.2 Quality

The fibrous material must facilitate trouble-free processing under standard production conditions in all delivery forms. In consideration of the specified packing density, bag-packed goods must be adapted with regard to the design of the respective muffler chamber.
Form FE 41 - 01.06

Page 1 of 6
Fachverantwortung/Technical responsibility 4–PKQ-2 Mr. Gallinger Tel.: +49-561-490-2859 Normung/Standards E2TC/4 Mrs. Hager-Süss E2TC Mr. Terlinden Tel.: +49-5361-9-49035

Confidential. All rights reserved. No part of this document may be transmitted or reproduced without prior permission of a Standards Department of the Volkswagen Group. Parties to a contract can only obtain this standard via the B2B supplier platform “www.vwgroupsupply.com”.

? VOLKSWAGEN AG

Norm vor Anwendung auf Aktualit?t prüfen / Check standard for current issue prior to usage.

Page 2 TL 52498: 2006-07

The contours of molded parts must be perfectly formed. If molded parts are assembled from several individual parts, glass fiber, PE or PP strips shall be used. For adhesive bonds, inorganic adhesives shall be preferred to organic ones. 3.3 Design and delivery form

According to drawing. Type C includes requirements according to Type A. Depending on the requirements
─ ─ ─

as filament (bobbin goods) to be directly inserted into mufflers, as filament packed in PP film bags or as organically bonded molded part. Weight in g

3.4

Nominal weight and tolerance acc. to drawing. For functional reasons, the weight shall always be specified so as to guarantee a minimum packing density of 120 g/l in consideration of the permissible tolerance. 4 Material requirements

For Type A and B, see Table 1. For Type C, see Table 2. Table 1 – Type A and B No. Property Unit Requirement Fibrous material Type A Type B Filament Molded Filament Molded part part Bobbin in PP Bobbin in PP goods bag goods bag ≤ 0,2 ≤ 0,2 ≤ 0,2 ≤ 0,5 ≤ 0,5 ≤ 0,5 ≤ 0,5 ≤ 0,5 ≤ 3,0 ≤ 0,5 ≤ 0,5 ≤ 3,0

1 2 3 3.1 3.1.1

3.1.2

Loss on drying, see Section 6.1 Ignition loss, see Section 6.2 Materials Fibrous material Chemical composition SiO2 CaO Fe2O3 Al2O3 MgO Na2O K2O B2O3 TiO2 Other constituents Fiber diameter, see Section 6.3

% %

% % % % % % % % % % ?m

59 to 62 20 to 24 ≤ 0,8 12 to 15 1,0 to 4,0 ≤ 2,0 ≤ 2,0 ≤ 0,5 ≤ 2,0
11 24 + ?7

50 to 56 7,5 to 10,0 7 to 11 16 to 19 3,5 to 7,0 2,0 to 4,0 ≤ 2,0 ≤ 2,0 9 to 32

Page 3 TL 52498: 2006-07

No.

Property

Unit

Requirement Fibrous material Type A Type B Filament Molded Filament Molded part part Bobbin in PP Bobbin in PP goods bag goods bag 7 020 ± 580 4 820 ± 400 with 5 800 individual fibers with 4 000 individual fibers 0 0

3.1.3 3.1.4 3.1.5

Fiber coarseness

tex

3.1.6

3.1.7

3.1.8

3.1.9 3.2 3.2.1

Percentage of beads, % see Section 6.4 Acid resistance, see Section 6.5 Weight loss % Akaline resistance, see Section 6.6 Weight loss % Glass transition temperature, see Section 6.7 ONSET temperature °C PEAK temperature °C Application temperature °C under continuous operation conditions, see Section 5.2 and 6.10 Recrystallization, see Section 6.8 Binding agents Base material

≤ 1,0

≤ 3,5

≤ 10,0

≤ 6,0

≥ 750 ≥ 780 still to be determined

≥ 1 100 ≥ 1 150 still to be determined

not permissible

-

-

acc. to sample (shall be specified) -

-

-

acc. to sample (shall be specified) -

3.3 3.3.1 3.3.2 3.3.3

Film Base material Nominal thickness Type

?m

-

PP 25 perforated across entire surface

PP 25 perforated across entire surface

Table 2 – Type C No. Property Unit Requirement Fibrous material Type C Filament Molded part Bobbin in PP bag goods ≤ 0,2 ≤ 0,2 ≤ 0,2 ≤ 0,65 ≤ 0,65 ≤ 3,0

1 2

Loss on drying, see Section 6.1 Ignition loss, see Section 6.2

% %

Page 4 TL 52498: 2006-07

No.

Property

Unit

Requirement Fibrous material Type C Filament Molded part Bobbin in PP bag goods

3 3.1 3.1.1

3.1.2 3.1.3 3.1.4 3.1.5

Materials Fibrous material Chemical composition SiO2 CaO Fe2O3 Al2O3 MgO Na2O K2O B2O3 TiO2 Other constituents Fiber diameter, see Section 6.3 Fiber coarseness

% % % % % % % % % % ?m tex

56 to 62 20 to 25 ≤ 0,2 11 to 15 ≤ 0,6 ≤ 0,5 ≤ 1,0 2,0 to 3,5 ≤ 2,0
11 24 + ?7

3.1.6

3.1.7

3.1.8

3.1.9 3.2 3.2.1 3.3 3.3.1 3.3.2 3.3.3

Percentage of beads, % see Section 6.4 Acid resistance, see Section 6.5 Weight loss % Akaline resistance, see Section 6.6 Weight loss % Glass transition temperature, see Section 6.7 ONSET temperature °C PEAK temperature °C Application temperature °C under continuous operation conditions, see Section 5.2 and 6.10 Recrystallization, see Section 6.8 Binding agents Base material Film Base material Nominal thickness Type

4 820 ± 400 with 4 000 individual fibers 0

≤ 2,0

≤ 2,0

≥ 760 ≥ 795 still to be determined

not permissible

-

-

acc. to sample (shall be specified) -

?m

-

PP 25 perforated across entire surface

Page 5 TL 52498: 2006-07

5 5.1

Functional requirements Fiber loss by blow out in %

See Section 6.9. Requirement still to be determined. 5.2 Application temperature under continuous operation conditions in °C

See Table 1, no. 3.1.8. The maximum application temperature is defined in consideration of time and mechanical load (e.g., due to gas pulsation). Requirements still to be determined. 6 6.1 Notes on testing Loss on drying

24 h at 110 °C in forced ventilation oven. 6.2 Ignition loss

2 h at 550°C in muffle furnace. The result refers to dried material (Section 6.1). The total ignition loss is composed of organic sizing and binding agent (e.g., phenolic resin, starch or similar). 6.3 Fiber diameter

Microscopic measurement. 6.4 Percentage of beads

A bead percentage of "0" arises from the fiber manufacturing method. 6.5 Acid resistance

A fiber specimen is pretreated in accordance with Section 6.2 (2 h at 550 °C). After this, 1 g of the pretreated fibrous material is statically aged in 200 ml half-concentrated hydrochloric acid (HCI 1:1) for 240 h at RT, then filtered, washed, dried, and reweighed. The specified weight loss is the difference compared to the initial weight in %. 6.6 Alkaline resistance

A fiber specimen is pretreated in accordance with Section 6.2 (2 h at 550 °C). After this, 1 g of the pretreated fibrous material is statically aged in 200 ml 20% sodium lye for 24 h at (50 ± 2) °C in a covered test vessel in the forced ventilation oven. Subsequently, the specimen is filtered, washed, dried and reweighed. The specified weight loss is the difference compared to the initial weight in %. 6.7 Glass transition temperature

Measurement using high-temperature differential scanning calorimeter (DSC) (heating rate 20 °C/min).

Page 6 TL 52498: 2006-07

6.8

Recrystallization

X-ray microstructure method (e.g., Debye-Scherrer Method); after pretreatment according to Section 6.2 (2 h / 550 °C). 6.9 Fiber loss by blow out

Procedure still to be determined. 6.10 Application temperature

Procedure still to be determined. 7 Referenced standards* Vehicle Supply Parts; Approval of First Supply and Changes Environmental Standard for Vehicles; Vehicle Parts, Materials, Operating Fluids; Avoidance of Hazardous Substances

VW 01155 VW 91101

*

In this Section, terminological inconsistencies may occur as the original titles are used.


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