1、INC”DI MIL-G-2857B 10 November 1984 SUPERSEDING HIL-G-2857A 28 June 1968 (See 6.6) Beneficial comments (recommendations, additions, deletions) and any pertinenc data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 5523, Department of t
2、he Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document improvement Proposal (DD Form 1126) appearing at the end of this document or by letter. I NILITARY SPECIFICATION CLASS, HEAT-TREATED, GLAZING, RECTMGUUR (FOR BRIDGE WINDOWS) This specification is approved for use
3、 by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scoq. This specification covers rectangular heat-treated quality This specification does not include clear glazing glass for bridge windows. bulletproof glass. 2. APPLICABLE DOCUMENTS 2.1 Government doc-. 2.1.1 SPecificatbns
4、 standar d. The following specifications and standard form a part of this document to the extent specified herein. otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cite
5、d in the solicitation (see 6.2). Unless SPECIFICATIONS FEDERAL PPP-B-636 - Boxes, Shipping, Fiberboard. PPP-F-320 - Fiberboard; Corrugated and Solid, Sheet Stock (Container Grade), and Cut Shapes. MILITARY MIL-L-19100 - Lumber and Plywood, Fire-Retardant Treated. Provided by IHSNot for ResaleNo repr
6、oduction or networking permitted without license from IHS-,-,-NIL-C-2857B STANDARD MILITARY MIL-STD-2073-1 - DoD Materiel Procedures for Development and pplication of Pachging Requirements. (Unless otherwise indicated, copies of federal 8nd Military specifications and standardti are available from t
7、he Nav8l Publications and Forms Center, (AT“: NPODS), 5801 Tabor Avenue, Philadelphia, PA 19120-5099.) 2.2 Non -Government Dt outside dimensions, 16 by 16 inches. The plates shall be cut from a 1-inch thick steel plate. smoothly planead and shall be covered with rubber gasket material 1/L) inch in t
8、hickness. The lower frame .hall be bolted to a wooden frame of such thickness that the clearance between the under glass surface and the floor is 4 inches. Since heat-treated glass sheets cannot be cut to size, it is necessary to use the sheets as received. The lower frame shall be placed on the flo
9、or, and the sheet of glass shall be placed so that the “overhang“ is nearly uniform. The upper frame shall then be placed with the rubber-protected edge down, so that the inner and outer edges coincide with the lower frame. placed as to drop the ball as near as possible to the center area of the gla
10、ss plate bounded by the frame. The surface shall be The ball suspension shall be so TABLE 1. Juma ct test mea surem ents . Thickness of Height of fall I glass of ball 1/4 5/16 3/8 7 8-1/4 10 4.4.2 Ljght transmissio n test. Samples shall be tested at the place of manufacture. The rectangular (paralle
11、l) luminous transmittance of the sheet of glass shall be measured at normal incidence calculated to the International Commission on Illumination “Illuminant A“. The original value shall be the photometer reading without the glass in position. after testing shall be considered as the percentage of th
12、e photometer readings with the glass in position as compared to the reading without the glass in pos ition. The luminous transmittance 4.4.3 polar iscoo ic examination. Samples shall be subjected to polariscopic examination as specified in 3.8. glass is subjected to stresses, the strained regions in
13、side are characterized by changes in their optical properties, whereby they became partially birefringent. The amount of birefringence produced at any point in the material is, in part, a measure of the strain existing there. containing strains is inserted between crossed polarizers, light is restor
14、ed in When ordinary transparent material such as Consequently, when a sample glass Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-flIL-G-ZS?B 5b 977990b 0146224 O D HIL-G-2857B the region under strain. This restored light usually appears in the form
15、 of various colored striations or colored patterns. concentric rings as Specified in 3.8, the lot represented shall be rejected. strain pattern in properly heat-treated plate glass ehall take the form of concentric rings of color ntar the edge of the plate of glass or ray represent regular patterns
16、of color (for example, Scotch plaid). Tkm glu6 ohall be moved to right or left as the pattern may not be visible at the particular angle in which the glass Ir placed with respect to the viewing polariscope used. A Nicol prism, or equal, or polaroid-equipped lens may be used, so long as the apparatus
17、 is equipped with a shutter mechanism carrying a tint plate so that the strain pattern may be viewed alternately as black lines or m a colored-fringed pattern. A typical black line pattern is illustrated on figure 1. If any glass does not show The 6.1.4 . Sanples ohall be visually examined under an
18、equivalent of light from a clear sunless sky when placed In a vertical position plus or minus 10 degrees. level with the center of the sample, he shall look through the sample from a distance of 36 inches, toward a brick wall or similar background at the same distance, 6howing essentially straight p
19、arallel lines. During this examination, the viewer shall move his head horizontally through a slight distance to each side. Under such conditions, and with the viewers eye on a L.5 -. Sample packs, and the inspection of the Presemation, packing and marking for shipment, stowage, and storage shall be
20、 in accordance with the requirements of section 5 and the documents specified therein. 5. PACKAGING (The packaging requirements specified herein apply only for direct Government acquisition.) 5.1.1 pr S. O - e (a) Treated lumber and 11- ood. Unless otherwise specified (see 6.2). all lumber and plywo
21、od (including laminated veneer material used in shipping containers and pallet construction, members, blocking, bracing, and reinforcing) shall be fire-retardant treated material conforming to KL-L-19140 as follows: Levels A and B - Type II - weather resistant. Level C - Type I - non-weather resista
22、nt. Category 1 - general use. Category 1 - general use. (b) Fiberboard. Fiberboard used in the construction of class- domestic, non-weather resistant fiberboard, cleated fiberboard boxes (including interior packaging forms) shall meet the flame spread index and the specific optic density requirement
23、s specified in PPP-F-320. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-2857B Sb 999990b Olt96225 2 HIL-C-2857B 5.2 Deservatiog. Preservation ahall be level A. Quantities of plate glass of uniform size lights, or a single light. shall be pa
24、ckaged in a snug- fitting fiberboard container conforming to PPP-B-636, class weather-resistant. Individual li&htc, and the top and bottom of the stack, shall be separated and overwrapped with a sheet of neutral unprintad paper. Containers shall be closed method V in accordance with the appendix to
25、the box specification. 5.3 m. Packing ahall be level A, B. C. or camerclal as specified (see 6.2). 5.3.1 bvels A. B. and C contglners . Glu8 pre8erved as 8pecified in 5.2 shall be packed in overaeas shipping containers in rccordance with MIL-STD-2073-1, table VI1 of appendix C, as specified (see 6.2
26、). The gross weight of a case of heat-treated glass shall not exceed 80 pounds. 5.3.2 m. Glass preserved as specified (see 5.2) shall be packed for shipment in accordance with ASTM D 3951 and herein. case of heat-treated glass shall not exceed 80 pounds. The gross weight of a S.& plor- (levels A. B.
27、 C. and com e retal1 . In addition to any special marking required (see 6.2), shipping containers shall be marked for shipment and storage in accordance with MIL-STD-2073-1, appendix F, and shall include bar codes and applicable packaging acquisition options herein as specified (see 6.2). S. S $Decm
28、 mark- . The shipping container shall be plainly marked “HEAT- TREATED GLASS - HANDLE WITH CARE“. 6. NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Jntended use. The glass covered by this specification-is intended to be use
29、d for bridge windows aboard ship and for general architectural use in construction. .- 6.2 &xuisit ion reauirements. Acquisition documents must specify the following: Title, number, and date of this specification. Issue of DoDISS to be cited in the solicitation, and if required, the specific issue o
30、f individual documents referenced (see 2.1.1 and 2.2). Rectilinear dimensions (see 3.3). Bevelling or grooving required (see 3.5). Thickness of glass desired (see 3.6). When fire-retardant treated lumber and plywood is not required Level of packing required (see 5.3). Additional packing requirements
31、 for level A, b, and C containers Special marking, if required (see 5.4). Bar coding and packaging acquisition options (see 5.4). (see 5.1.1(a). (see 5.3.1). 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-28578 5b 799990b Olrb22b D NfL-G-285
32、7B 6.3 1 . The following data requirements .* rhwld be considered when this apecification is 8ppli.d on a contract. The rpplicable Dat8 Item Descriptions (DIDr) should be reviewed in conjunction with the specific acquisition to ensure th8t only essential &ta art requested/ provided and that the DIDI
33、 are tailorod to reflect the rquir.rsntr of the specific acquisition. requir-nts, a Contract Data bquirsiente Ust (DD Porn 1423) ust be prepared to &tain the bu, except uhert DoD FAR Supplement 27.475-1 -ti the requirement for a DD Form 1123. To aneurm cormct coaaatual rppliccrtinn of the &ta 3.5 DI
34、 4-7031 Drnrings , engineering - and rorociatd lists The above DID was cleared as of the date of this specification. The current issue of DoD 5010.12-L, Acquisition Hanagement Systems and Data Requirements Control List (AFISDL), must be researched to ensure that only current, cleared DIDs are cited
35、on the DD Form 1423. 6.4 Wted or aualitv confow cem n. Sampling for quality confornance inspection should be as epecified in 6.4.1 through 6.1.3. 6.1.1 a. A lot should consist of all glass of one rire produced in one plant under roentially the rame conditions. 6.4.2 Sam- for vis-nsional ewtio ns. Sa
36、mples for visual examination should be in accordance with level I of HIL-STD-105, and the acceptable quality level (AQL) should be 4.0 percent defective. Samples for dimensional examination should be in accordance with level S-3 of MIL-STD-105, and the AQL should be 2.5 percent defective. 6.6.3 for
37、test s. in accordance with level 5-2 of PUL-STD-105. for rejection of the lot represented by the sample. Samples for quality conformance tests should be Failure of any test should be cause 6.5 Subiect term kev word) lis-. Grooving Impact resistance Light transmission Po lari scop ic examination 6.6
38、mes fr om urevious iss ue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extensiveness of the changes. Custodians: Navy - SH Air Force - 84 Amy - ME Preparing activity : Navy - SH (Project 5620 -0028 ) 7 Provided by IHSNot for Resa
39、leNo reproduction or networking permitted without license from IHS-,-,-MIL-G-28578 56 m 999990b OlLib227 b m KIL-C-28578 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-257B Sb 999990b 0lLIb228 8 m HIL-C-2857B FIGURE 1. Strain oattern. 8-1/2 in ches diam eter. 7/8 inch thick - Continued 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
