1、 NOT MEASUREMENT SENSITIVE MIL-HDBK-695E 20 October 2011 SUPERSEDING MIL-HDBK-695D w/CHANGE 2 23 May 2005 DEPARTMENT OF DEFENSE HANDBOOK RUBBER PRODUCTS: RECOMMENDED SHELF LIFE THIS HANDBOOK IS FOR GUIDANCE ONLY. DO NOT CITE THIS HANDBOOK AS A REQUIREMENT. AMSC N/A FSC 9320 Provided by IHSNot for Re
2、saleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-695E ii FOREWORD 1. This handbook is approved for use by all Departments and Agencies of the Department of Defense (DoD). 2. This handbook is for guidance only. The handbook covers elastomeric products of Military, Fed
3、eral, and recognized industry specifications. It provides guidance as to the time periods during which these elastomeric products may be stored without deterioration. 3. Comments, suggestions, or questions on this document should be addressed to Commander, Naval Inventory Control Point, Attn: Code P
4、077, 700 Robbins Avenue, Philadelphia, PA 19111-5098 or emailed to matthew.l.feenavy.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduction
5、 or networking permitted without license from IHS-,-,-MIL-HDBK-695E iii CONTENTS Paragraph Page FOREWORD ii 1. SCOPE 1 1.1 Scope . 1 1.2 Applicability . 1 1.2.1 Products included . 1 1.2.2 Products excluded 2 1.3 Application 2 2. APPLICABLE DOCUMENTS 3 2.1 General 3 2.2 Government documents 3 2.3 No
6、n-Government publications 3 3. DEFINITIONS 3 3.1 Age resistance . 3 3.2 Cure date . 3 3.3 Shelf life 4 3.4 Service life 4 4. GENERAL GUIDANCE 4 4.1 Introduction . 4 4.2 Type of rubber. 4 4.3 External factors influencing shelf life . 4 4.3.1 Packaging . 4 4.3.2 Storage . 4 4.3.2.1 Temperature 4 4.3.2
7、.2 Humidity . 5 4.3.2.3 Ozone 5 4.3.2.4 Light 5 4.3.2.5 Stock rotation 5 4.4 Documents 5 4.4.1 Cancelled documents . 5 4.4.2 Supersession . 5 4.4.3 Superseding documents . 5 5. NOTES 6 5.1 Intended use 6 5.2 Subject term (key word) listing . 6 5.3 Changes from previous issue 6 Provided by IHSNot for
8、 ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-695E iv TABLES TABLE I. Age resistance generally associated with products fabricated from various rubbers. 7 TABLE II. Documents. . 8 TABLE III. Documents having material composition of natural or synthetic rubber.
9、26 TABLE IV. Documents having material composition of synthetic rubber. 30 APPENDIX A A.1 SCOPE . 31 A.1.1 Scope . 31 A.2 APPLICABLE DOCUMENTS 31 A.3 REMOVAL CRITERIA 31 A.4 DISPOSITION TABLES . 31 APPENDIX A TABLES TABLE V. Material cross reference. 31 TABLE VI. Document cross reference. . 32 CONCL
10、UDING MATERIAL 37 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-695E v THIS PAGE INTENTIONALLY BLANK Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-695E 1 1. SCOPE 1.1 Scope. This
11、 handbook provides guidance for establishing time periods for the expected life of elastomeric products during shelf storage. The use of the expected shelf storage lives listed herein is NOT MADE MANDATORY by this handbook. This handbook is for guidance only and cannot be cited as a requirement. The
12、 decision as to whether or not a product will have a limit placed upon the time that it may remain in storage is a function of the agency responsible for the products ultimate use. 1.2 Applicability. The handbook covers only elastomeric products described by Government specifications and standards o
13、r by nationally recognized technical society specifications and standards. The documents defining the items covered by this handbook were selected from the following sources: a. Acquisition Streamlining and Standardization Information System (ASSIST) (available from https:/assist.daps.dla.mil/quicks
14、earch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Philadelphia, PA 19111-5094). b. SAE International (available from www.sae.org or from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001). c. National Aerospace Standards (NAS) (available from www.aia-aero
15、space.org or from Aerospace Industries Association of America, Inc., 1000 Wilson Boulevard, Suite 1700, Arlington,VA 22209). d. ASTM International (available from www.astm.org or from ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959). 1.2.1 Products included. The types of
16、elastomeric products covered by this handbook are as follows: a. Products fabricated solely from rubber. These include solid rubber, cellular rubber and hard rubber (ebonite) items. b. Composites in which the rubber is present as a discrete phase. Examples are cables, fabric reinforced gaskets, non-
17、aerospace hoses, rubber coated fabrics, shock mounts and tires. c. Kits, accessories and outfits. The shelf life for these items should be determined by the component with the earliest expiration date. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
18、MIL-HDBK-695E 2 1.2.2 Products excluded. The types of products excluded from this handbook are as follows: a. Rubber-base adhesives, coatings, sealers, and liquid rubber materials packaged in cans or tubes. b. Rubber tapes. c. Aerospace o-rings and other molded seals. Refer to SAE ARP5316 for recomm
19、ended shelf lives. d. Aerospace bulk hoses and hose assemblies. Consult SAE AS1933 for age control limits for acceptance of aerospace bulk hoses and hose assemblies. e. Non-aerospace bulk hoses and hose assemblies (surface vehicle, industrial and marine application). Consult SAE J517 for age control
20、 limits for acceptance of non-aerospace bulk hoses and hose assemblies. f. Unvulcanized rubber, such as tread repair stock and tank lining sheet stock. g. Composites in which the rubber is in admixture with other ingredients, for example, rubber-asbestos packings and rubber-cork gaskets. h. Subassem
21、blies, assemblies and systems which contain elastomeric items as component parts, such as small arms, weapons, vehicles, aircraft, missiles and space vehicles. i. Products fabricated from flexible materials that are not elastomeric, for example, some plastics. 1.3 Application. The information contai
22、ned in this handbook is intended to be used as a guide by those agencies whose responsibility it is to place control requirements on rubber products, as well as by those activities whose responsibility it is to control the age of products stocked in Government storage facilities. The handbook is not
23、 intended for use in controlling the age of rubber products prior to their acceptance by the Government or by Government contractors. The decision as to whether or not to dispose of “overage“ products is not made mandatory by this handbook. Responsible activities should make every attempt to limit t
24、he procurements of rubber products to the extent that large volumes of “overage“ products will not be accumulated in storage. Where technically feasible and economically practical, “overage“ products should be reviewed to determine whether or not they still meet the requirements of the applicable sp
25、ecifications. Products within their shelf life range should also be reviewed if visual examination shows any signs of accelerated aging. Procurement documents should require the mold marking of the cure date, such as the year and month on the rubber product (or on its package) and careful records ke
26、pt of the cure date of all stored rubber products. When age limitations of the item specification listed herein conflict with the requirements herein, the requirements of the item specification take precedence. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from
27、 IHS-,-,-MIL-HDBK-695E 3 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed below are not all of the documents referenced herein. See 4.4.1 4.4.3 for information on how specifications are referenced within this handbook. 2.2 Government documents. Government documents are available from https:
28、/assist.daps.dla.mil/quicksearch/ or from the Standardization Document Order Desk, 700 Robbins Avenue, Philadelphia, PA 19111-5094). 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. SAE AS1933 Age Controls for Hose Containing Age-S
29、ensitive Elastomeric Material. (DoD adopted) SAE ARP5316 Storage of Aerospace Elastomeric Seals and Seal Assemblies Which Include an Elastomer Element Prior to Hardware Assembly. (DoD adopted) SAE J517 Hose, Hydraulic. (DoD adopted) (Copies of these documents are available online at http:/www.sae.or
30、g or from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001.) 3. DEFINITIONS 3.1 Age resistance - Resistance to deterioration in storage by environmental factors, such as heat, light and ozone. 3.2 Cure date - The date the rubber is fully cured. Two methods in expressing the cure
31、date are as follows: a. Shelf life to a maximum of 3 years. Cure date stated in terms of month of calendar year and the year, e.g., 6-83. b. Shelf life in excess of 3 years. Cure date stated in terms of the quarter of calendar year and the year, e.g., 2Q-83. Provided by IHSNot for ResaleNo reproduct
32、ion or networking permitted without license from IHS-,-,-MIL-HDBK-695E 4 3.3 Shelf life - The maximum period of time between the cure date and the date the elastomeric product is first removed or unpackaged for installation or fabrication into a component part of a subassembly, assembly, or system.
33、During the shelf life time, the stored elastomeric product is expected to retain its characteristics as originally specified, if it is stored under proper storage conditions. 3.4 Service life. A general term used to quantify the average or mean life of an item once put in use. Service life, which is
34、 depicted in years, is the number of years of economical service reasonably expected of equipment as established in applicable DoD, Service, and/or Agency manuals, bulletins, regulations, instruction manuals, and/or the technical judgment of the item and/or equipment manager. 4. GENERAL GUIDANCE 4.1
35、 Introduction. The key factor involved in the shelf life of rubber end products is the age resistance of the rubber from which the product was fabricated. External factors such as packaging and storage conditions (e.g. temperature, humidity, ozone, light, etc.) can reduce the effective shelf life of
36、 rubber products. Additionally, commodity specification requirements may contain criteria that influence end product shelf life. The relative importance of these factors is difficult to assess, especially because the age resistance of the raw rubber does not always correspond to the age resistance o
37、f the finished product. Note: SAE ARP5316 was used as a basis for developing Table I shelf life values and providing the external factors that influence an items shelf life. Appendix A provides a cross reference of all materials (Table V) and specifications (Table VI) that have been removed from the
38、 previous revision of this handbook. 4.2 Type of rubber. Certain types of rubber are more age resistant than others. This is due to the inherent stability of the chemical bonds of those rubbers. For example, the bonds in silicone rubber are not susceptible to attack by oxygen or ozone, therefore it
39、has a much higher age resistance than other rubbers. Table I indicates the age resistance generally associated with products based on various types of rubber. 4.3 External factors influencing shelf life. The following external factors should be considered so as to not shorten an items shelf life. 4.
40、3.1. Packaging. All rubber shelf life items should be adequately packaged to prevent any deterioration of the item. As contact with other materials, such as liquids, semi-solids, metals, other elastomers, etc., can affect item shelf life, it is recommended that rubber shelf life items be individuall
41、y preserved. 4.3.2 Storage. Proper storage of rubber shelf life items is critical so as not to shorten the shelf life of the item. Important factors to consider when storing rubber shelf life items are specified in 4.3.2.1 4.3.2.5. 4.3.2.1 Temperature. Rubber end products should be stored below 100
42、F (38 C). It may be necessary to raise the temperature of the product if it was stored below its optimum use Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-HDBK-695E 5 temperature prior to installation. Optimum installation temperatures may vary
43、 based on the end use or application of the product. 4.3.2.2 Humidity. Rubber end products should be stored in an atmosphere of less than 75 percent relative humidity. Extra care should be taken when storing polyurethane rubbers as they are more susceptible to degradation through exposure to humidit
44、y. 4.3.2.3 Ozone. Minimize exposure to ozone, since ozone can degrade some unprotected rubber products. This is especially pertinent when products are stored in a manufacturing environment, as equipment that uses high voltage sources or emits combustion products generates precursors to ozone formati
45、on. 4.3.2.4 Light. Rubber products should not be stored in direct sunlight or ultraviolet light. 4.3.2.5 Stock rotation. In general, stock of rubber end products should be issued based on their shelf life expiration date. Use of a first-in, first-out (FIFO) principle based on cure date may aid in th
46、is process. 4.4 Documents. The documents listed in Table II, Table III, and Table IV list only the documents which had procurements within 10 years of the date of this handbook. Tables III and IV do not list specific shelf life dates because the specific rubber types are not defined in the document.
47、 The shelf life values listed in Table II were determined based upon the optimum storage conditions and the type of rubber commonly used or required by the document. 4.4.1 Cancelled documents. Since shelf life items have been procured to cancelled documents and they are actively stocked, there is a
48、need to list these documents in this handbook along with their corresponding shelf life. 4.4.2 Supersession. In order to determine the proper shelf life of an item when referring to documents, the characteristics of the end item procured must be known. If a document has been superseded and is specif
49、ied on the contract, then a determination must be made on which document the delivered item meets (i.e., does the delivered item meet the cancelled document or the superseding document?). 4.4.3 Superseding documents. The parenthetical documents (superseding documents) listed after the document title in Ta
