1、- - MIL-C-70810 13 m 9999906 0484242 4 m ILITARY SPECIFICATIO MIL-C- O810 (AR) 28 May 199 S COMBUSTIBLE CARTRIDGE CASE ASSEMBLY PARTS NITROCELLULOSE PAPER PROCESS, FOR CHARGE, PROPELLING, 155MM, M203A1 This specification is approved for use by the US Army Armament, Munitions and Chemical Command and
2、 is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope, This specification covers requirements, quality assurance provisions and packaging for the paper used to manufac- ture combustible case components for the artil.3ery propelling charge designated a
3、s M2O3Al Charge, Pro.pel1ing 155MM. 2. APPLICABLE DOCUMENTS 2.1 - Government documents. 2.1-1 - SEecifications - L- standards and handbooks. - The follow- ing specification, standards and handbooks form a part of this document to the extent Specified herein. Unless otherwise specified, the issues of
4、 documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and Supplement thereto, cited in the solicita- tion (see 6.2). SPECIFIC ATIONS MILITARY MIL-A-48078 - Ammunition, Standard Quality Assurance Provisions, General Specifications For MIL
5、-C-70462 - Charge, Propelling, 15SMM, M2O3Al Loading, Assembly and Packing Beneficiat cumments (reuommenaatiaaS, ad Volume of Gas in Eudiometer Tube (mi) Barometric Pressure (mm Hg), Table IV Temperature Correction (mm Hg) Table IV Vapor Pressure of Water over 33% w/w NaOH at T (mm Hg) Table V Local
6、 Gravity & Sea Level Values corrected to standard values 20 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I l 1 I l I I 1 I t ! i i I I I I I l i I I I I I I I I I I I I i I l l I l I I I MIL-C-70810 13 W 9999906 0484262 T -_ - MIL-C-7081 O (AR) Pr
7、epare samples as follows: Cut a specimen into 1/4 inch or smaller squares, Dry to constant weight using microwave moisture analyzer. Displace the nitric oxide (NO) from the previous run by aspirating the gases through the drain or venting through a hood. Open the stop- cock at the top of the eudiome
8、ter tube and carefully raise the leveling bulb until all the gas has been expelled. Rest the bulb in its holder and stopper it. Loosen the eudiometer tube from the rubber stopper in the bottom of the bath and drain the NaOH in the tube into the tank. Fill the leveling bulb to 90% of its capacity and
9、 place the empty eudiometer tube back onto the rubber stopper and secure it. Fill the eudiometer to the 0.0 ml mark with the leveling bulb, remov- ing all air bubbles, close the stopcock, secure the bulb and stopper it. Replace the 33% w/w NaOH as needed to maintain a constant level in the tank. Qua
10、ntitively transfer 0.8 - 1.0 g (weighed to + 0.1 mg) of the dry sample into a 250 ml Kjeldahl flask, add 50 mL deionized water and a few glass beads to prevent bumping. Attach the addition funnel/check value assembly to the freshly greased joint of the Kjeldahl flask. Attach spring clamps or rubber
11、bands to the ears of the flask and ad- dition funnel. Adjust the gas evolution assembly so that the exit tube is gently resting on the bottom of the NaOH bath. Place the lead band round the exit tube opening. Open the addition funnel stopcock and turn on the heating mantle, Following the purging of
12、the Kjeldahl flask, close the addition funnel stopcock and purge the rest of the tubing for 5-10 minutes. The sys- tem .is thoroughly purged when no more bubbles escape into the bath. Remove the heating mantle from the Kjeldahl flask and observe the drawing of the NaOH solution into the exit tubing
13、and the closing of the check valve. Remove the eudiometer tube from the rubber stopper, place it over the open end of the exit tube. Rest the bottom of the eudiometer tube on the lead band and secure the eudiometer. Refill the leveling bulb to 90% of its volume, stopper the bulb and place it back in
14、to its ring. Place 25 ml of FeCl2 solution into the addition funnel, Open the stopcock slowly and allow most of the FeC12 to flow into the flask. Retain a few drops in the stopcock to preclude the flow of air into the system. If air is allowed into the system, the analysis is in- valid and must be r
15、epeated. Place 25 ml of concentrated HC1 to the addition funnel and add it to the Kjeldahl flask. Add 10 ml deionized water in a similar fashion. Following the last addition, fill the 21 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-70810 (AR
16、) addition funnel with 30 ml deionized water and tighten the stopcock nut. Place the heating mantle around Kjeldahl flask and heat, for 20- 30 minutes or until bubbling has stopped. Remove the heating mantle and check to see that the valve closes. Loosen the stopcock nut on the addition funnel, allo
17、w the water to drip into the Kjeldahl, then increase the flow to effectively rinse the walls of the flask, close st6pcock before air enters and tighten the nut. Attach the heating mantle, tap the check valve lightly until it opens and continue for 5- 10 more minutes. Following the completion of the
18、reaction, remove the heating mantle and observe the closing of the check valve. Carefully move the eudiometer tube from its present position back to the rubber stopper and secure it. Slowly release the vacuum inside the Kjeldahl flask by allowing water and air to enter the flask through the stopcock
19、. Tap the check valve to help it open. Allow the gas to equilibrate thermally with the water in the jacket around the eudiometer tube. Wait at least 20 minutes. Measure the volume of gas collected in the eudiometer tube by uncorking the leveling bulb and adjusting it so that the top of the fluid in
20、the bulb is at exactly the same height as the top of the fluid in the eudiometer tube. Read the volume to the nearest 0.1 ml. Use the following equation to calculate the % NC in the sample. %NC v= B= c= P= F= N= w= T= s= - - 2.246 V (B - C - P - SI F - NW (273.15 + T) Volume of Gas in Eudiometer Tub
21、e (mi) Barometric Pressure (mm Hg) Temperature Correction (mm Hg) Table IV Vapor Pressure of Water over 33% (w/w) NaOH at T (mm Hg) Table IV Eudiometer Factor Percent Nitrogen in NC (%) Mass of Sample (g) Temperature of Condenser Water (Degrees C) Local Gravity & Sea Level values corrected to standa
22、rd values PREPARATION OF FeC12: - - Prepare the solution by adding 1000 g of FeC12.4H20, 1200 ml deionized water and 70 ml of concentrated HC1 to a 5 liter round bot- tom flask. Attach the reflux condenser and reflux for 20 minutes. Cool to room temperature. Slowly add 20 grams of iron filings or po
23、w- der to the cool solution. When the gas evolution has stopped, filter quickly without aerating the solution to remove the fines. Use A.C.S. grade chemicals throughout th synthesis. I I I I I I I I * 22 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
24、,-I l l ! I l l l l l l l l I I i l l l l 1 l I I I l l I I l t I I l l 1 I MIL-C-70LO 13 9999906 0484264 3 W - MIL-C-70810 (AR) Prepare the bath fluids by dissolving reagent grade NaOH in deionized water until the concentration is 33% weight to weight. 23 Provided by IHSNot for ResaleNo reproductio
25、n or networking permitted without license from IHS-,-,-_ - _ MIL-C-70810 13 m 999990b 0484265 5 MIL-C-7081 O (AR FIGUREL SCHULTZ - TIEMANN APPARATUS I I I I I l ,. 24 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-C-70LO 13 m 9999906 0484266 7
26、 m MIL-C-70810 (AR) TABLE IV BAROMETRIC PRESSURE IN mm Hg - 740 760 780 Temp (See Note 1) 14 1.69 15 1.81 16 1.93 17 2.05 18 2.17 19 2.29 s 20 2.41 21 2.53 22 2.65 23 24 2.77 2.89 25 3.01 26 3.13 27 3.25 28 3.37 1.73 1.86 1.98 2.10 2.23 2.35 2.47 2.60 2.72 2.84 2.97 3.09 3.21 3.34 3.46 1.78 1.91 2.0
27、3 2.16 2.29 2.41 2.54 2.67 2.79 2.92 3.05 3.17 3-30 3.42 3.55 Note 1: Temperature (Degrees C) on Barometer Thermometer. Vapor Pressure of Water Dyer 33% (w/w) NaOH Variable F Temperature of Condenser Water O .( C) I 18 I 19 f 20 f 21 I 22 I 23 I 24 I 25 I P= I 11.6 I 12.4 I 13.2 I 14.0 I 14.9 I 15.8
28、 I 16.8 I 17.81 Barometric pressure temperature correction, Variable C 25 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-._ _._ _ . MIL-C-70810 13 9999906 0484267 9 MIL-C-70810 (AR) TABLE V Pressure correction value due to the vapor pressure of sodi
29、um hydroxide solution in the eudiometer tube. TEMPE RATURE VAPOR PRESSURE OF O NaOH SOLUTION - (mm Hg) - C - 18 19 20 21 22 23 24 25 11.6 12.4 13.2 14.0 14.9 15.8 16.8 17.8 Calculation of P (actual pressure) given a temperature T (actual temperature): a a (T -T ) X (P - P ) + P = p al 21 la Where: T
30、 = actual condenser water temperature a 1 a 2 a 1 1 T = next lowest tabulated temperature value from T P = pressure at next highest tabulated temp from T P = pressure at T 4.5.5.3.3.1 Nitrocellulose (Alternative method). To provide good heat conduction to the solvent, place a sufficient quantity of
31、glycerin on the flask bottom and on the surface of the heat source to produce a continuous film. Add 10 ml of ethyl alcohol to the thimble and residue from 4.5.5.3.1 and extract with acetone using the method in 4.5.5.3.1. After extraction dry the residue remaining at 100 + 2 Degrees C for one hour.
32、Cool in a desiccator (1/2 hour min) weigh to the nearest 0.2 mg (Weight D). Evaporate the acetone extract to dry- ness and the inert atmosphere throughout this test. Reflux the solution for five (5) minutes. Add to the flask, via the condenser, 25 ml of 0.7N ferrous amonium sulfate (prepared per MIL
33、-STD-286, Method 604.1) and 10 ml concentrated hydrochloric acid. Reflux for thirty (30) minutes more to obtain a yellow liquid in which the specimen is completely disintegrated. With the inert gas still run- ning, cool in a water bath to room temperature. Add 5 ml of 20% ammoniumthiocyanate solutio
34、n (MIL-STD-286, Method 601.1). Perform a blank titration on the reagents. Calculate the percent NC as follows: P 26 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I- MIL-C-70810 13 = 7999906 O484268 9 MIL-C-70810 (AR) % NC = 46.69N (V-B) x 100 IE W
35、Where: V = Volume titanious chloride used for sample, ml B = Volume titanious chloride used for blank, ml W = Weight of dried sample, ml N = Normality of titanious chloride E = Percent nitrogen in the nitrocellulose 4.5.5.3.4 Talc content (ash test). The specimen of approximately 1 - 1.5 grams shall
36、 be taken from the same case body for the above testing and weighed to within 0.2 mg. in a tared porcelain crucible. Cover the crucible. The specimen shall then be ignited at 500 Degrees C in a muffle furnace. The crucible shall be cooled at room tempera- ture and then weighed. Heat until all eviden
37、ce of carbon is gone (no black residue), or for one hour. The increase in weight of the crucible shall be calculated on a total volatile - free basis to the percent of talc content. u 5 4.5.5.3.5 Kraft, resin and additives. Calculate the percent kraft, resin and additives as follows: $ Kraft + % res
38、in + % additives = 100 - (% NC + % DPA + % Talc) 4* 5.5.3.6 Report the total methylene chloride extractables w - C X 100 and the total acetone extractables (C - DI X 100 W W 0 4.5.6 Tensile strength. Two specimens shall be prepared from each wrapped body. The specimens shall be taken from the center
39、 of the wall of the body. Test specimens shall be taken 180 Degrees apart. The specimens shall have a one-inch gage length and width, but wall thickness shall fall within the tolerance specified on the ap- plicable drawing. The test specimens shall be preconditioned for a minimum of 4 hours at 23 pl
40、us or minus (+) 2 Degrees centigrade (C) at a relative humidity of 50 + 5 percent (%. The tensile breaking strength of the specimen shall be determined in accordance with ASTM- D-638, using a cross head speed of one (1) inch per minute. 27 Provided by IHSNot for ResaleNo reproduction or networking p
41、ermitted without license from IHS-,-,-c -_ .-. ._ MIL-C-70810 13 9999906 04842b9 2 E MIL-C-7081 O (AR) 4.5.7 Density. Six (6) specimens shall be taken from each wrapped body in accordance with Figure 2. Three (3) specimens shall be taken from each rear cap, enclosure cap and igniter container sample
42、 in accordance with Figure 3, Figure 4 and Figure 5 respec- tively. All the specimens shall be dried for 3 hours at 105 Degrees C or for 12 hours at 70 Degrees C. The specimen thickness shall be measured, the volume computed and the sample weighed on a calibrated scale having an accuracy of + 0.02 g
43、. The average density for each part shall be calculated and-shall be in accordance with the ap- pl icable requirements. 28 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I I I l i 1 I I I I I I I 1 I I I i I I Q 4- b. -1 ,MIL-C-70810 13 m 9999906 04
44、84270 9 m - i MIL-C-70810 (AR) - - T - -0- L z 1. Three samples, 1 in. X 3 in. displaced by 1200 for testing the density. (Each from top and bottom) h . FIGURE 2. Body 29 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ _ MIL-C-70810 13 9999906 0484
45、273 O MIL-C-7081 O (AR) 1. Three samples, 1/2 in. by 1/2 in. displaced by 120 for density test. FIGURE 3. Rear Cap 30 s I 1 I l ! I l I I I I I I l l l I I I I 1 1 I I I 1 I i I I l I I I I 1 I l l 1 I I I I I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
