1、1 MIL-STD-298 73 7977733 URLLOLL E 98 17 January 1957 SUPERSEDING November 1954 NAVSJHIPS 250-344-6 I THIS DOCUMENT CONTAINS - q-1 PAGES / Licensed by Information Handling ServicesMIIATD-298 17 January 1957 II ISTA Y 17 January 1957 Supply aiid Logistics VISUAL INSPECTION GUIDE FOR RUBBER EXTRUDED G
2、OODS MIL-STD-298 1. This standard lias been approved by the Department of Defense and is mandatory for use by tlie Departments of t.he Army, the Navy, and the Air Force, effective immediately. 2. In accordance witli established procedure, the Standardization Division lias designated the Ordnance Cor
3、ps, the Bureau of Ships, aiid the Air Force, respectively, as Army-Xavy-Air Force custodians of this standard. 8. Recommended corrections, additions, or deletions sliould be addressed to the Standardization Division, Office of tlie Assistant Secretary of Defense (Supply and Logistics), Washington 25
4、, D. C. R Licensed by Information Handling ServicesFOREWORD Government material procurement specifications have been primarily concerned Ath detailing composition, construction, and necessary physical requirements. However, little attention has been paid to defining the limits of amptable quality re
5、garding manufacturing defkts other than such general- izations as “the workmanship shall be first class. In such a diverse industry as that of rubber manufacturing, individual plants vary considerably in their production and .quality control techniques. Defects are likely to occur from many causes,
6、such as variation in the quality of the basic materials and vari- ations in manufacturing processes and finishing operations. Theref ore, the quality generalizations used in this document must of necessity cover a con- siderable range which represents the best available judgment. This document is is
7、sued as a practical yardstick which inspectors will use to appraise visually the quality of rubber extruded goods. III Licensed by Information Handling Servicese MMTD-298 17 January 1957 IV 4. DEFECT DESCRIPTIONS Table I-Defects Classication_- 1- . r- AND CLASSIFICATION - - _ _ - - - - - 1 TABLES A
8、2 Licensed by Information Handling ServicesMIL-STD-278 73 999779LL OOL60LEi T LIST OF FIGURES 1. Cross sections of typical extrusions. 2. Cross sections of typical extrusions. 3. Cross sections of typical extrusions. 4. Cross sections of typical extrusions. 5. Identification marks. Bottom example- 6
9、. Stain or discoloration-not a defect. 7. Minor deformation-not a defect. 8. Delamination-major, all casa. 9. Foreign material-major, all cases. 10. Foreign material-major, all cases. 11. Split mark-major, all cases. 12, Hole or open blister-major, all cases. 13. Small lump or closed blister. Sealin
10、g sur- face-minor. Wonsealing but visible sur- face-not a defect. Nonsealing and non- visible surface-not a defect. 14. Lump or closed blister. Sealing surface- major. Nonsealing but visible surface- minor. Nonsealing and nonvisible sur- f ace-not a defect. 15. Lump or closed blister. Sealing surfac
11、e- major. Wonsealing but visible surface- minor. Nonsealing and nonvisible sur- face-not a defect. 16. Large lump or closed blister. Sealing sur- face-major. Nonsealing but visible sur- face-major. Nonsealing and nonvisible surf aceminor. 17. Rough, Sealing sudace-minor. Non- sealing but visible sur
12、face not a defect, Nonsealing and nonvisible surface-not a defect. 18. Rough. fSealing surface-major. Non- sealing but visible surfaceminor. Non- sealing and nonvisible surfacenot a de- fect. 19. Rough. Sealing -surface-major. Non- sealing but visible surfacemino% Non- sealing and nonvisible surface
13、-not a defect. 20. Rough. Sealing surface-major. Non- sealing but visible surfacemajor. Won- sealing and nonvisible surfaceminor. single line. Top example-pyramids. - - - .; 1 _- .F 7- .r e- = % -. - - - - -.-_ MIMTD-298 17 January 1957 21. Small multiple lumps or closed blisters. Sealing surface-mi
14、nor. Nonsealing but visible surface-not a defect. Nonsealing and nonvisible surface-not a defect. 82. Small multiple lumps or closed blisters. Sealing- surface-major. Nonsealing but - visible surface-minor. Wonsealing and nonvisible surface-not a defect. 23. Small multiple lumps or closed blisters.
15、Sealing surface-major, Nonsealing but visible surface-minor. Nonsealing and nonvisible surface-not a defect. 24. Small multiple lumps or closed blisters. Sealing surface-major. Nonsealing but visible surface-major. Nonsealing and nonvisible surf ace-minor. 25. Contact roughness. Sealing surface-mi-
16、nor. Nonsealing but visible surface-not a defect. Nonsealing and nonvisible sur- facenot a defect. 26. Contact roughness. Sealing surface-ma- jor. Nonsealing but visible surface- minor. Nonsealing and nonvisible sur- face-not a defect,. 27. Contact roughness. Sealing surface-ma- jor. Nonsealing but
17、visible surface- minor. Nonsealing and nonvisible sur- face-not a defect. 28. Contact roughness. Sealing surface-ma- , jor. Nonsealing but visible surface- major, Nonsealing and nonvisible sur- f ace-minor. 29. Abrasion. Sealing surf ace-minor. Non- sealing but visible surface-not a defect. Nonseali
18、ng and nonvisible surf ace-not a defect. 30. Abrasion. Sealing surfacemajor. Non- sealing but visible surface-minor. Non- sealing and nonvisible surf ace-not 8. defect. 31. Abrasion. Sealing surface-major. Non- sealing but visible surface-minor. Non- sealing and nonvisible surface-not a defect. 32.
19、Abrasion. Sealing surface-major. Non- sealing but visible surface-major. Non- sealing and nonvisible surface-minor. V Licensed by Information Handling Services1. SCOPE AND PURPOSE 1.1 $cope.-This document covers the de- fects for conventional rubber extruded goods, that is, items which are made by f
20、orcing un- vulcanized rubber compound through a forming die and which are subsequently cured without being confined in a mold. Cast plastisol items, coated electrical wire and items containing cel- lular rubber are specifically excluded. 1.2 Purpose.-The primary objective of this document is to pres
21、ent word descriptions and photographs of possible defects in rubber ex- truded goods that may be presented for in- spection. In addition, it provides a training aid for inspectors. 12.1 In general, this document is not in- tended to take the place of a particular inspec- tion procedure aid which may
22、 be provided for inspectors to verify conformance with a particular specification. The quality require- ments specified in the basic specific a t ion are governing. 2% REFERENCED DOCUMENTS 2.1 Standards MILITARY: MILSTD-105-Sampling Procedures and Tables for Inspection by At- tributes. MIL-STD-177-R
23、ubber P r o d U c t I, Terms for Visible Defects of. (Copies of specifications, standards, drawings, and publications required by contractors in connection with specific procurement functions should be obtained from the procuring agency or as directed by the contracting offlcer. 1 3. DEFINITIONS 3.1
24、 The categories, major and minor defects; are as defined in Standard MILSTD-105. 3.2 Word descriptions of visible defects used in this standard are in accordance with Standard MIL-STD-1-77, 3.3 Abrasion.-An uneven edge or feather- ing where two surfaces come together. 3.4 . Corntact roughmess.-$urfa
25、ce heveil- ness where the extrusion rested on the curing pan. MUTD-298 17 January 1957 3.5 Foreigm material.-Extraneous mate- rial, such as paper, wood or metal, in the extrusion. 3.6 Eumg.-Surface protrusion of the basic material as distinguished from foreign ma- terial. 3.9 Rough.-$tiirface uneven
26、ness where the compound does not extrude smoothly. 3.8 Spider mark.-A delamination, that is, a cleavage where the compound did not unite after passing the spoke of the spider in an ex- trusion machine. 33 Split mark.-4 slit or cleavage in the surface. 4. D E F E C T DESCRIPTIONS AND %ASS%FICAT%ON 4.
27、1 $inca the classification of man:r defects depends on the service requirement of a par- ticular surface of the extrusion, it is imperative that the end uses (see 4. 3) of thevarious ex- trusion surfaces be known before inspection is started. In many cases, the procurement docu- ment will contain th
28、is information. In other cases, where a common generic name, such as a refrigerator door gasket, is used in the procure- ment document, the functions of the various surfaces will be readily apparent. However, in case of doubt, the technical bureau or agency concerned (on primes) or the endorsing in-
29、 spection service (on subs) should be requested to supply this information. 4.2 For clarity, the following are listed: 4.2.1 1delzti)eation marka.-These are raised lines in the shape of pyramids or flats which are most commonly used to identify the manufac- turer. Correctly used they are not defects
30、. However, when used where the procurement document proscribes their use or when used to misidentie the item, they are major defects. 4.2.2 Stains, discdoration, bloom and sur- f ace di and the fact that the Government may have formulated, furnished, or in any way supplied tlie said drawings, specif
31、ications, or other data is not to be regarded by implication or otherwise us in any manner licensing the holder or any other person or corporation, or conveying any rights or permission to manufacture, use, or sell any patented invention that may in any wag be related thereto. Cudodians: Army-Ordnan
32、ce Corps Navy-Bureau of Ships Air Force Arm y-CEMQSig Navy AMCOrY. Other interest: Licensed by Information Handling ServicesJTXIXJFE 1.-Groee sectwm of typical eltrusbns. - -r . . MILSTD-298 17 January 1957 i i 5 Licensed by Information Handling ServicesMIL-STD-298 93 79797kL 61133661Z3 5 . ML-STD-2
33、98 I7 January 1957 FIQIJEE 2.-Cr088 sections of typical estrusimis. y 6 / -_ 4- - .- Licensed by Information Handling ServicesMIL-STD-278 73 77737a13 001e022 7 FIQUEE 3.-Crosg sections of typical eztrilsions. , .?, MWTD-298 17 January 1957 7 Licensed by Information Handling ServicesM WTD-298 II Sanu
34、ary 1957 Licensed by Information Handling ServicesI ME-STIB-298 17 January 1959 PIWJBE S.-Identification marks. Bottom e8ample-eingle ine. - . Top eaample-pyramds. 9 Licensed by Information Handling ServicesMUTD-298 17 January 1957 FIGURE 6.-gtain OP dCscoloratiort-not a defec%. Licensed by Informat
35、ion Handling ServicesMIL$TD-298 17 January 1957 FIGUBE 7.-Minor deformathMt a defect. 11 Licensed by Information Handling Services1 I MIL-STD-298 93 7997733 00160Z7 b MGSTD-298 17 January 1957 12 ;: , FIGURE 8.-Delamination-major, all cases. . , Licensed by Information Handling ServicesMIL-STD-278 7
36、3 $77773L 0036028 B MPLSTD-298 17 January 1957 FIGURE %-Foreign material-major, all caaey. 13 Licensed by Information Handling ServicesFIGURE lO.-Foreign materia- .I% . -.- . _ L - _. r-: t 21 Licensed by Information Handling Services.I* , 22 RQUBE 18.-Rough. iSealing ewface-major. Noneealing but vi
37、sible surface-minor. Nonsealhg and nonvisible surface-mt a defect. ; i Licensed by Information Handling ServicesMIL-STD-278 73 977791% 0036038 O b FIQUBE 19.-Rough. Ymealing but visible eurface-minor. Realing surfce-majot . I Nonaealing and nonvisible eurface-mt a defect. r L. MCSTD-298 17 January 1
38、957 23 Licensed by Information Handling Services-. MIL-STD-278 73 77997aiL 001b037 2 , i Licensed by Information Handling ServicesMWTD-298 17 January 1957 FIQVRE 2I.-i3tnall multiple lumps or closed b.%ster8. Kealing surface-minor. Notwealing but visible eurface-not a defect. Nomealing and nonuisible surface-mt a defect. Licensed by Information Handling Services
