1、I %-97-/? -. MIL-R-25506C SUPERSEDING 24 April 1975 MIL-R-255066 MILITARY SPECIFICATION RESIN SOLUTION, SILICONE, LOW-PRESSURE LAMINATING This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE- 1 .l Scope. This specification covers the requireme
2、nts for low-pressure laminating silicone resin used in the fabrication of glass fabric-based plastic laminates that conform to MIL-P-25518 (see 6.1 and 6.3). 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1 1 Specifications, standards, and handbooks. Unless otherwise sPecified. the followins so
3、ecifications, standards. and handbooks of the issue . lhsted in-that issue of-the Department f Defense Index of Specifications and Standards (DoDISS) specified in the solicitation form a part of this specification to the extent specified herein. -h SPECIFICATIONS . FEDERAL PPP-C-96 - Cans, Metal, 28
4、 Gage and Lighter, PPP-D-705 - Drum, Shipping and Storage, Steel, 16 and 30 Gallon PPP-D-729 - Drums, Shipping and Storage, Steel, 55 Gallon (208 PPP-P-704 - Pails, Metal: (Shipping, Steel, 1 through 12 Gallon). Capacity. Liters) . MI L ITARY MIL-P-25518 - Plastic Materials, Silicone Resin, Glass Fi
5、ber Base, Low Pressure Laminated. Beneficial comments (recommendations, additions, deletions) and any pertinent data whlch may be of use in improving this document should be addressed to: Engineer1 ng Specifications and Standards Department (Code 93), Naval Air Engineering Center, Lakehurst, NJ 0873
6、3, by using the self -addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC TH18 DOCUMENT CONTAINS PAGES, 9330 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I- - flIL-R-2550bC
7、 93 9q9990b 0319205 4 m MIL-R-25506C STANDARDS MI L ITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by MIL-STD-129 - Marking for Shipment and Storage. MIL-STD-147 - Palletized Unit Loads. Attributes. (Copies of specifications, standards, handbooks, drawings, and publications requir
8、ed by manufacturers in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. The issues of the docum
9、ents which are indicated as DoD adopted shall be the issue listed in the current DoDISS and supplement thereto, if applicable. UNIFORM CLASSIFICATION COMMITTEE, AGENT Uniform Freight Classification Rules (Application for copies should be addressed to the Uniform Classification AMERICAN SOCIETY FOR T
10、ESTING AND MATERIALS (ASTM) Committee, Room 1106, 222 South Riverside Plaza, Chicago, IL 60606.) ASTM D 974 - Neutralization Number by Color-Indicator Titration. ASTM D 1084 - Viscosity of Adhesives. ASTM D 1209 - Color of Clear Liquids (Platinum-Cobalt Scale). ASTN D 1259 - Nonvolatile Content of R
11、esin Solutions. ASTM D 1298 - (Application for copies should be addressed to the American Society for (Industry association specifications and standards are generally available Density, Specific Gravity, or API Gravity of Crude Petro- leum and Liquid Petroleum Products by Hydrometer Method. Testing
12、and Materials, 1916 Race Street, Philadelphia, PA 19103.) for reference from libraries, They are also distributed among technical groups and using Federal agencies. ) 2.3 Order of precedence. In the event of a conf 1 ict between the text of this snecification and the references cited herein, the tex
13、t of this specification shall take precedence. 3. REQUIREMENTS 3,l Materials. The materials used in the manufacture of the resin shall react to form a product which complies with the requirements of this specification. The resin shall be of the silicone, thermosetting, low-pressure laminating type.
14、shall be such that the cured system shall not be corrosive to metals. The component materials of the resin system -2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-R-2550bC 73 7779706 OLL7206 6 MIL-R-25506C 3.2 - Form. The resin shall be be dis
15、solved in a suitable solvent and shall be suitable for impregnating fabric. mat ter. The resin shall be free of foreign 3.3 Code number. The manufacturer shall designate each resin composition The by a code number. base resin shall be included as part of the code number, components or manufacturing
16、procedures shall-necessitate use of a different code number. The code number may include the trade name if desired. Any changes in the 3.4 Physical and reactive properties. Physical and reactive properties for the resin furnished under this specification shall be as specified in table I. 3.5 Shelf l
17、ife. The minimum shelf life of the unactivated resin, when stored at a temperature of 32.2OC (90OF) maximum in the suppliers unopened unit containers, shall be 90 days following the suppliers date of shipment. During this 90 day period, the resin shall be capable of forming laminates conforming to t
18、he requirements of the applicable laminate specification. 3.6 Workmanship. The material specified herein shall be processed as required in accordance with the best practice for a high quality resin. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the
19、contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection req
20、uirements specified herein, unless disapproved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections-are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Classification of i
21、nspections. The inspections spec classified as quality conformance inspections (see 4.3) fied herein are 4.3 Quality conformance inspection. 4.3.1 Lot formation. Unless otherwise specified herein, a lot shall consist of all the resin of one code number or designation offered for inspection at one ti
22、me. 4.3.1.1 Sampling. 4.3.1.1.1 Physical property inspection. One gallon of liquid resin or 10 pounds of dry resin shall be selected at random from each lot; also an equivalent quantity of any curing agent which is to be furnished with the resin under the contract (see 6.2.1) The sample selected sha
23、ll be examined for all the requirements in table II. requirement therein shall be cause to reject the lot represented by the sample. Failure of the sample to pass any c - s Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI L-R-25506C 4.3.1.1.2 Packa
24、ging inspection. lhe lot size for this inspection shall be the total number of shipping containers. The sample unit shall be one container fully prepared for delivery, just prior to closure. The MIL-STD-105 inspection level shall be S-2 and the AQL shall be 4.0 percent defective. Inspection shall be
25、 in accordance with 4.6. 4.4 Test conditions. 4.4.1 Standard conditions, Specimens shall be conditioned and tested at an air temperature of 23“ + 1,lC (73.4 t. 2OF) and relative humidity of 50 L t 4 percent. lhe conditioning period,prior to test, shall be 96 hours. 4.5 Test methods. 4.5.1 Specific g
26、ravity. lhe specific gravity of the unactivated and of the cured unfilled resin shall be determined in accordance with ASTM D 1298 or by weighing a specific volume of the resin in grams and dividing by the volume in cubic centimeters. 4.5.2 Viscosit . The viscosity of the liquid unactivated resin sh
27、all be determined + in accor ance with ASTM D 1084. 4.5.3 Nonvolatile content. Nonvolatile content of the resin shall be determined in accordance with ASTM D 1259, method A, using a 1.5 gram (to nearest 0,0001 gram) sample heated 3 hours at 135“ L t 1C (275 5 2F). Nonvol ati le content shall be dete
28、rmined as fol lows : Percent nonvolatile content = .final weight x 100 initial weight 4.5.4 Gel time, Gel time shall be determined by the manufacturer at 160 + 1C q320“-_+2F)* 4.6 Packa in . The sample selected in 4.3.1.1.2 shall be inspected as specified T-%? n ta e III. 5. PACKAGING 5.1 Preservati
29、on, Preservation shall be level A or industrial, as 5.1.1 Level A. The resin solution shall be packaged, as specified (see specified (see 6.2.le). 6.2.lf), in 1-gallon or smaller cans conforming to type V, class 2, round, of PPP-C-96; 5-gallon pails conforming to type II, class 3 of PPP-P-704; 16-ga
30、llon drums conforming to type III of PPP-0-705; or 55-gallon drums conforming to type III or type IV of PPP-729. Cans in accordance with PPP-C-96 shall be rust-resistant coated on the exterior in accordance with plan B of that specification and the side seam shall be striped with a suitable corrosio
31、n-resi stant coating. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- . MIL-R-2550bC 73 W 797790b 0339208 T W MIL-R-25506C 5.1.2 Industrial. Packaging shall be such as to afford adequate protection against corrosion, deterioration and damage durin
32、g shipment from the supply source to the first receiving activity for immediate use. Providing this requirement is met, packaging in accordance with the suppliers commercial practice shall be acceptable. 5.2. Packin . (see 6.2.le T_e Packing shall be level A, 13 or industrial, as specified 5.2.1 Lev
33、el A. Resin solution packaged in containers conforming to PPP-C-96 shall be packed in accordance with the overseas requirements of the appendix thereto. Resins packaged in containers conforming to PPP-P-704, PPP-D-705 or PPP-D-729 require no overpacking. When specified (see 6.2.19), 5-gallon pails a
34、nd 16-gallon drums shall be palletized in accordance with MIL-STD-147. 5.2.2 Level B. Resin solution packaged in containers conforming to PPP-C-96 shall be packed in accordance with the domestic requirements of the appendix thereto. Resins packaged in containers conforming to PPP-P-704, PPP-D-705, o
35、r PPP-D-729 require no overpacking. When specified (see 6.2.1g), 5-gallon pails and 16-gallon drums shall be palletized in accordance with MIL-STD-147. 5.2.3 Industrial . Low pressure laminating resin solution, packaged as specified inhall be packed to afford protection against corrosion, deteriorat
36、ion and damage during direct shipment from the supply source to the first receiving activity for immediate use. Containers shall comply with Uniform Freight Classification Rules or other common carrier regulations applicable to the mode of transportation. In addition to any special marking required
37、by or herein, interior packages, exterior unit loads shall be marked in accordance with MIL-STD-129. The nomenclature shall include: RESIN, SI LICONE, LOW-PRESSURE LAMI NATI NG MIL-R-25506C Code number (see 3.3) Date of shipment Storage conditions Hand1 i ng i nstruct i ons 6. NOTES 6.1 Intended use
38、. Low-pressure silicone resin solution covered by this specification is intended for use in fabricating MIL-P-25518 laminates for general structural parts, aircraft radio and radar antenna housing, and .other applications. Laminate requirements are found in MIL-P-25518. 5 Provided by IHSNot for Resa
39、leNo reproduction or networking permitted without license from IHS-,-,-MIL-R-25506C 6.2 .Orderi ng data, 6.2.1 Acquisition requirements. Acquisition documents should sp fol lowing: ify th a, Title, number and date of this specification. b. Quantity (weight) (see 6.2.2). c, Curing agent to be furnish
40、ed, when applicable (see 6.3). d. Electrical requirements, when applicable (see table I). e. Levels of preservation and packing required (see 5.1 and 5.2). f. Size and type of containers required (see 5.1 and 5.2). g. Whether palletizing is required (see 5.2.1 and 5.2.2). h. Special marking, if requ
41、ired (see 5.3). 6.2.2 Purchase. unit. The unit of purchase for the resin is the pound, 6.3 Resin systems, The silicone resin described in this specification is used in resin systems comprising the resin itself dissolved in a solvent and a curing agent or agents (hardener, accelerator, etc,), which m
42、ay constitute a large percentage, by weight, of the cured silicone product. The resins furnished under this specification may be furnished as pre-mixed systems in a partially reacted condition in a single container or the curing agents may be packaged separately to be mixed with the resin at time of
43、 use, In the latter cace, the packaged curing agents may be acquired with the resin or may be acquired separately. It should be understood that the optimum properties of a given brand of resin may not be developed in the cured product if the curing agents and procedures are not in accordance with th
44、e manufacturers recomendat i ons , 6.4 Changes from previous issue. Asterisks are not used in this revision to identify changes with respect to the previous issue due to the extensiveness of the changes. Custodians : Amy - MR Navy - AS Air Force - 20 Review activities: Air Force - 99 Amiy - AR, AV,
45、MI OLA - GS Preparing activity: Navy - AS (Project No. 9330-0956) ! 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-2550bC 93 m 9999906 0339230 B m MIL-R-25506C TABLE I. Physical and Reactive Properties. Unacti vated base resin : Specific gra
46、vity Viscosity at 25OC (77OF), CPS Color, max Nonvolatile content, percent min Acid number, neutral number, max Activated resin: Cured, unfilled resin: Gel time at 160C. (32OoF), minutes Speci fi c gravi ty Dielectric constant Loss tangent Requirement 3.08 + 1 20 - 50 250 59 0.02 10 + 1 - 1.08 t 1 1
47、 /- I/ Test paragraph 4.5.1 4.5.2 ASTM D 1209 4.5.3 ASTM D 974 4.5.4 4.5.1 1/ When electrical properties are required (see 6.2.ld), the manufacturer shall furnish nominal values, adequate for design calculations for dielectric constant and loss tangent. 7 Provided by IHSNot for ResaleNo reproduction
48、 or networking permitted without license from IHS-,-,-TABLE II. Physical property inspection. - 1/ Property Specific gravity Vi scosi ty Col or Nonvolatile content Acid number Gel time Paragraph Requirement 3,4 3,4 3.4 3.4 3.4 3.4 Test method 4,5*1 4.5.2 ASTM D 1209 4.5.3 ASTM D 974 4.5.4 No. of tes
49、t spec i mens Average results to nearest .0.01 unit 1 unit I 2/ 1 percent L 2/ I + 30 seconds I 1/ When electrical properties are specified (see table I), test values shall be averaged and reported as specified by the manufac$urer. L 2/ Results shall be reported as specified in the ASTM method. TABLE III. Examination of packaging. I Exami ne Preservation Packing Count Weight Markings Defect Not level. speci
