SAE AMS 3909B-2014

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AEROSPACE MATERIAL

SPECIFICATION

AMS3909 REV. B

Issued 1985-07

Revised 2008-01

Reaffirmed 2014-08

Superseding AMS3909A

Cloth, Aramid

Intermediate Modulus

RATIONALE

AMS3909B has been reaffirmed to comply with the SAE five year review policy.

__________________________________________________________________________________________________________________________________________

SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is

entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”

SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and

suggestions.

recording, or otherwise, without the prior written permission of SAE.

TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada)

Tel: +1 724-776-4970 (outside USA)

Fax: 724-776-0790

Email: CustomerService@sae.org

SAE WEB ADDRESS: http://www.sae.org

SAE values your input. To provide feedback

on this Technical Report, please visit

http://www.sae.org/technical/standards/AMS3909B

1. SCOPE

1.1 Form

This specification and its supplementary detail specifications cover an intermediate modulus aramid yarn in the form of

cloth.

1.2 Application

This cloth has been used typically in construction of parachutes, but usage is not limited to such applications.

1.3 Classification

The requirements specified herein and in the applicable detail specifications define each cloth by weight and breaking

strength, both of which are shown in the titles of the detail specifications.

2. APPLICABLE DOCUMENTS

The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the

extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue

is specified. When the referenced document has been cancelled and no superseding document has been specified, the

last published issue of that document shall apply.

2.1 ASTM Publications

Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959,

Tel: 610-832-9585, www.astm.org.

ASTM E 168 General Techniques of Infrared Quantitative Analysis

SAE INTERNATIONAL AMS3909B Page 2 of 8

2.2 U.S. Government Publications

Available from the Document Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue,

Philadelphia, PA 19111-5094, Tel: 215-697-6257, http://assist.daps.dla.mil/quicksearch/.

FED-STD-191 Textile Test Methods

2.3 ASQ Publications

Available from American Society for Quality, 600 North Plankinton Avenue, Milwaukee, WI 53203, Tel: 800-248-1946

(North America) or +1-414-272-8575 (International), www.asq.org.

ANSI/ASQZ 21.4 Sampling Procedures and Tables for Inspection by Attributes

2.4 Federal Trade Commission Publications

Available from the Federal Trade Commission, 600 Pennsylvania Avenue, N.W., Washington, DC 20580, Tel: 202-326-

2222 or www.ftc.gov.

Textile Fiber Products Identification Act, Rules and Regulations

3. TECHNICAL REQUIREMENTS

3.1 Detail Specifications

Requirements for a specific cloth shall consist of requirements specified herein in addition to requirements specified in the

applicable detail specification. In case of conflict between requirements of this specification and an applicable detail

specification, requirements of the detail specification shall govern.

3.2 Material

Cloth shall be woven from an intermediate modulus para-aramid yarn (See 8.3) as shown in Table 1. Yarn shall not

carbonize at a temperature lower than 780 °F (416 °C) determined in accordance with FED-STD-191, Method 1534.

Attenuated total reflectance infrared analysis methods in accordance with ASTM E 168 shall be used to identify the

material.

TABLE 1 - INITIAL YARN MODULUS

Yarn Size

Denier

Initial Modulus

gms/denier ±10%

200

400

1000

1500

3000

740

670

605

565

545

3.3 Properties

Shall conform to requirements specified in the applicable detail specifications. Tests shall be performed on the cloth

supplied and in accordance with specified test methods.

3.4 Quality

Cloth, as received by purchaser, shall be clean, evenly woven, and free from foreign materials and from imperfections

detrimental to usage of the cloth.

SAE INTERNATIONAL AMS3909B Page 3 of 8

4. QUALITY ASSURANCE PROVISIONS

4.1 Responsibility for Inspection

The manufacturer of the cloth shall supply all samples and shall be responsible for the performance of all required tests.

Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the

cloth conforms to specified requirements.

4.2 Classification of Tests

4.2.1 Acceptance Tests

Requirements shown in Table 2 are acceptance tests and shall be performed on each lot.

TABLE 2 - ACCEPTANCE TESTS

Requirement

Paragraph

Reference

Material Identification

Weight

Breaking Strength

Quality

3.2

See Detail Specification

3.4

4.2.2 Preproduction Tests

All technical requirements are preproduction tests and shall be performed prior to or on the initial shipment of cloth by the

manufacturer, when a change in ingredients and/or processing requires reapproval as in 4.4.2, and when purchaser

deems confirmatory testing to be required.

4.3 Sampling and Testing

Shall be as follows:

4.3.1 For Acceptance Tests

Sufficient cloth shall be taken at random from each lot to perform all required tests. The number of determinations for

each requirement shall be as specified in the applicable test procedure or, if not specified therein, not less than three.

4.3.1.1 A lot shall be all cloth of a single weight and breaking strength produced in a single production run under the

same fixed conditions and presented for manufacturer’s inspection at one time.

4.3.1.2 The sample unit shall be 4 yards (3.7 m), full width, of the finished cloth. The sample size shall be as shown in

Table 3. Lot size shall be expressed in units of 1 yard (0.9 m). The lot shall be unacceptable if one or more

sample units fail to meet any specified requirement.

TABLE 3 - CLOTH SAMPLING

Lot Size

Yards

Lot Size

Meters

Sample

Size

Up to 800, incl

Over 800 to 22, 000, incl

Over 22, 000

Up to 732, incl

Over 732 to 20,117, incl

Over 20, 117

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摘要：

SAE AMS 3909B-2014 是美国汽车工程师学会（SAE）发布的一项航空航天材料规范，主要涵盖以聚四氟乙烯（PTFE）涂覆的玻璃纤维纱线制成的机织布。该标准规定了材料的结构、性能要求、测试方法及验收标准，确保产品在高温、耐化学腐蚀及电气绝缘等极端环境下的可靠性与一致性，广泛应用于航空航天领域的绝缘层、隔热罩及防护覆盖材料。

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