SAE AMS 3678-4B-2016

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AEROSPACE

MATERIAL SPECIFICATION

AMS3678™/4

REV. B

Issued 1999-03

Reaffirmed 2006-06

Revised 2010-11

Stabilized 2016-02

Superseding AMS3678/4A

Type 4

25% Glass Filled Virgin Polytetrafluoroethylene (PTFE) Moldings or Extrusions

RATIONALE

This document has been determined to contain basic and stable technology which is not dynamic in nature.

STABILIZED NOTICE

This document has been declared "Stabilized" by the SAE AMS P Polymeric Materials Committee and will no longer be

subjected to periodic reviews for currency. Users are responsible for verifying references and continued suitability of

technical requirements. Newer technology may exist.

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1. SCOPE

1.1 Form

This specification covers a polytetrafluoroethylene (PTFE) resin filled with 25% glass fiber in the form of extruded or

molded rods or tubes which are sintered after molding or, in the case of extrusions, sintered during the extrusion process.

1.2 Application

These products have been used typically for dynamic seal components requiring dimensional stability up to 450 °F

(232 °C), but usage is not limited to such applications. Each application should be considered individually.

2. APPLICABLE DOCUMENTS

See AMS3678.

3. TECHNICAL REQUIREMENTS

3.1 Basic Specification

The complete requirements for procuring the products described herein shall consist of this document and the latest issue

of the basic specification, AMS3678.

3.2 Material

All products shall be molded or extruded from virgin polytetrafluoroethylene (PTFE) powder conforming to ASTM D 4894,

Type II or Type IV, uniformly blended with the specified filler. The blended powder shall consist of 25% ± 2 milled glass

fibers and the remainder virgin PTFE powder, filler percentage measured by weight.

SAE INTERNATIONAL

AMS3678™/4B

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3.2.1 Filler

It is recommended that the milled glass fiber should be E-glass produced through a 14 micron die, then hammer milled,

and finally passed through a 0.032 inch screen.

3.3 Properties

The product shall conform to the requirements shown in Table 1.

TABLE 1 - MATERIAL PROPERTY REQUIREMENTS

Property Requirement Test Method

3.3.1 Tensile Strength, min 1800 psi (12.4 MPa) ASTM D 4745

3.3.2 Elongation, min 180% ASTM D 4745

3.3.3 Specific Gravity 2.15 to 2.26 ASTM D 792

3.3.4 Dimensional Stability 0.002 inch per 1 inch, max

measured on circumference 4.5.3.1 of AMS3678

3.3.5 Color Off White to Dark Gray

4. QUALITY ASSURANCE PROVISIONS

See AMS3678.

5. PREPARATION FOR DELIVERY

See AMS3678.

6. ACKNOWLEDGMENT

See AMS3678.

7. REJECTIONS

See AMS3678.

8. NOTES

See AMS3678.

PREPARED BY AMS COMMITTEE “P"

SAE INTERNATIONAL

AMS3678™/4B

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摘要：

SAE AMS 3678-4B-2016是美国汽车工程师学会（SAE）发布的航空材料规范，专为聚四氟乙烯（PTFE）玻璃纤维织物层压垫片材料制定。该标准明确了材料在航空、航天及高端工业领域的性能要求、测试方法及验收标准，内容涵盖材料的物理机械性能、热稳定性、化学惰性及厚度公差等关键指标。作为AMS 3678系列的第4部分，该版本更新了耐温极限和尺寸稳定性参数，确保材料在极端环境下的密封与绝缘可靠性。适用于飞机燃油系统、液压管路及电气设备的垫片设计，是工程选材、质量控制和供应链合规的重要依据。

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