1、The Engineering SocietyFor Advancing MobilityLand Sea Air and SpaceINTERNATIONAL400 Commonwealth Drive, Warrendale, PA 15096-0001AEROSPACEMATERIAL AMS 3267/4ASPECIFICATION Issued 1 APR 1984Revised 1 APR 1992Submitted for recognition as an American National Standard Superseding AMS 3267/4SEALING COMP
2、OUND, LOW ADHESION, CORROSION INHIBITING9,000 to 14,000 Poises (900 to 1400 Pa.s), 2 Hour Application Time (B-2)1. SCOPE:1.1 Form:This specification covers accelerated curing synthetic rubber compounds withcorrosion inhibitors and low adhesive strength supplied as a two-componentsystem.1.2 Applicati
3、on:This product has been used typically for sealing aircraft access doors andaccessories where gaskets are required, but usage is not limited to suchapplications. Compound is classified as a B-2 sealing compound; the compoundbeing suitable for application by an extrusion gun or spatula with a minimu
4、mapplication time of two hours after the start of mixing.2. APPLICABLE DOCUMENTS:See AMS 3267.3. TECHNICAL REQUIREMENTS:3.1 Basic Specification:The complete requirements for procuring the sealing compound described hereinshall consist of this document and the latest issue of the basicspecification,
5、AMS 3267.3.2 Properties:Compound, mixed in accordance with manufacturers instructions and cured asspecified in the basic specification, shall conform to the followingrequirements, determined in accordance with test methods listed in AMS 3267an Table 1.dSAE Technical Standards Board Rules provide tha
6、t: “This report is published by SAE to advance the state of technical and engineeringsciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patentinfringement arising therefrom, is the sole responsibility of the user.”SAE r
7、eviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites yourwritten comments and suggestions.Copyright 1992 Society of Automotive Engineers, Inc.All rights reserved.Printed in U.S.A.91-0942/EGAMS 3267/4A SAE AMS 3267/4ATABLE 1 - P
8、ropertiesParagraph Property Requirement3.2.1 Color3.2.1.1 Base Compound3.2.1.2 After Curing3.2.2 Specific Gravity, maximum3.2.3 Nonvolatile Content, minimum3.2.4 Viscosity of Base Compound(See 4.2)3.2.5 Flow (See 4.3)3.2.6 Application Time(See 4.4)3.2.7 Tack-Free Time, maximum3.2.8 Hardness (Cure ti
9、me to attain30 Durometer “A“), minimum3.2.9 Peel Adhesion3.2.10 Resistance to Heat3.2.11 Resistance to Salt Water andHydrocarbons3.2.12 Weight Lossand Flexibility3.2.13 Low-Temperature Flexibility3.2.14 Accelerated Storage Stability3.2.14.1 Application Time, minimum(See 4.4)ReddishReddish1.6592% by
10、weight9,000 to 14,000 poises(20 to 60 Pa.s)0.10 to 0.75 inch (2.5 to 19.0 mm)2 hours after the beginning ofmixing, 15 grams per minute, minimum,shall be extruded24 hours, measured from the beginningof mixing72 hours4 pounds force per inch (700 N/m)width maximum; 98% adhesive failure,minimumNo visual
11、 evidence of softening,sponging, blistering, checking,cracking, shrinkage, or powderingNo visual evidence of softening,blistering, or evidence ofcorrosion8% weight loss;No cracking when bentNo visual evidence of cracking orcheckingTwo hours, measured from thebeginning of mixing-2-AMS 3267/4A SAE AMS
12、 3267/4ATABLE 1 - Properties (Continued)Paragraph Property Requirement3.2.14.2 Tack-Free Time, maximum 24 hours, measured from the beginningof mixing3.2.14.3 Viscosity of Base Compound 9,000 to 14,000 poises(900 to 1400 Pa.s)3.2.15 Soluble Chromate Content,minimum2.5% by weight4. QUALITY ASSURANCE P
13、ROVISIONS:See AMS 3267 and the following:4.1 Application of Sealing Compound:Unless otherwise specified herein, test panels shall be given an applicationof sealing compound to produce a coating having a thickness of 1/8 inch 1/64 (3.2 mm 0.4) when cured.4.2 Viscosity of Base Compound:Shall be determ
14、ined with the base compound placed in a 1 quart (1 L) can.The can shall be filled with base compound to within 1/2 inch (12.7 mm) ofthe top, covered, and stored at 25 C 1 (77 F 2) for not less thaneight hours. The base compound shall then be thoroughly mixed by stirringslowly for three minutes after
15、 which the can shall be closed and the basecompound allowed to stand for one hour. The Brookfield Model RVFviscosimeter with No. 7 spindle at 2 rpm, or equivalent, shall be used andthe readings obtained converted to poises. The highest reading shall betaken after the instrument has run in the compou
16、nd for one minute.-3-AMS 3267/4A SAE AMS 3267/4A4.3 Flow:A standard Semco sealant gun cartridge, or equivalent, fitted with a nozzle,shall be filled with freshly mixed sealing compound. The gun and sealingcompound shall be maintained at standard conditions throughout the test. Thetest shall be condu
17、cted with a flow-test jig as shown in Figure 1. Depth ofplunger tolerance is critical and shall be controlled within the toleranceduring all tests. The flow-test jig shall be placed on a table with thefront face upward and the plunger depressed to the limit of its travel.Within 15 minutes after the
18、beginning of mixing, enough of the-mixed sealingcompound shall be extruded from the application gun to fill the recessedcavity of the jig and leveled off even with the block. The test at thisinterval shall be considered the initial flow of the sealing compound.Within 10 seconds after the leveling op
19、eration, the jig shall be placedupright on its end and the plunger immediately advanced to the limit of itsforward travel. The flow measurement shall be taken 30 minutes after thesealing compound has been applied to the test jig. The flow shall bemeasured from tangent to the lower edge of the plunge
20、r to-the furthest pointto which flow has advanced. As the sealing compound progresses in itsapplication time, the flow-test shall be repeated 90 minutes after the end ofmixing.4.4 Application Time:The base compound, accelerator, and application gun shall be stabilized atstandard conditions for not l
21、ess than eight hours before not less than250 gram of base compound is mixed with the proper amount of accelerator.The mixed sealing compound shall be promptly used to fill a standard Semcosealing compound gun cartridge, or equivalent, having a Semco 440 nozzle withan orifice diameter of 0.125 inch 0
22、.005 (3.18 mm 0.13). The gun andsealing compound shall be maintained at standard conditions throughout thetest. The gun shall be attached to a constant air supply of 90 psi 5(621 kPa 34). From 2 to 3 inches (51 to 76 mm) of sealing compound shallbe extruded initially to clear trapped air. At the end
23、 of two hours,measured from the beginning of the mixing period, the sealing compound shallbe extruded onto a suitable receptacle for one minute and the amount ofextruded sealing compound determined.5. PREPARATION FOR DELIVERY:See AMS 3267.6. ACKNOWLEDGMENT:See AMS 3267.7. REJECTIONS:See AMS 3267.8. NOTES:See AMS 3267.-4-AMS 3267/4A SAE AMS 3267/4AMATERIAL: Aluminum AlloyDIMENSIONS IN INCHES (MILLIMETERS).TOLERANCES: DECIMALS 0.016 INCH ( 0.41 mm)FIGURE 1. Flow-test jig.I-5-
