UDC 629.113.01:629.113-592.2:621.93:668.4 JAPANESE INDUSTRIAL STANDARD Automotive parts — Elastomeric boots of hydraulic disc brakes cylinders using a non-petroleum base hydraulic brake fluid JIS D 2611»: Translated and Published by Japanese Standards Association Printed in Japan us‘UDC 629. 113, 01: 629. 113-592. 2: 621. 93: 668. 4 JAPANESE INDUSTRIAL STANDARD JIs Automotive parts — Elastomeric boots D 2611-1995 of hydraulic dise brakes cylinders using a non-petroleum base hydraulic brake fluid 1. Scope ‘This Japanese Industrial Standard specifies the rubber boots (here- after referred to as "boots") assembled to the hydraulic dise brakes for ‘automobiles using non-petroleum base hydraulic brake fluid for the purpose of prevention of the intrusion of foreign matters, water, etc. into its inside. Remarks: The following standards are cited in this Standard: JIS D 2605 Rubber cups for hydraulic cylinders for automotive hydraulic brake systems using a non-petroleum base hydraulic brake fluid JIS D 2609 Road vehicles — Elastomeric seals for hydraulic disc brake cylinders using a non-petroleum base hydraulic brake fluid JIS K 2233 Non-petroleum base motor vehicle brake fluids JIS K 6251 Tensile testing methods for vulcanized rubber JIS K 6253 Hardness testing methods for vulcanized rubber JIS K 6257 Accelerated aging test methods for vuleanized rubber JIS K 6259 Testing methods of resistance to ozone cracking for vuleanized rubber JIS K 6262 Permanent set testing methods for vulcanized rubber JIS Z 8401 Rules for rounding off of numerical values 2. n Boots shall be classified as given in Table 1. ‘Table 1, Classification of boots Classification Division ‘Type 1 The boots capable of being used under ordinary conditions Type 2 ‘The boots capable of being used under the conditions at a high temperature 3. Quality 3.1 Appearance Boots shalll be free from blisters, pin holes and cracks on the surface and shall not exist intrusion foreign materials. 3.2 Performance When boots are tested in accordance with 4., their perfor- mance shall be as given in Table 2.( ‘Auyjood pu s9ys1]q 09 10U [TeYs ex9yT, oes, (wonepeulop jo oBeyuanu0d) | % aauey xeur oF] woReAuo[o Jo aBeyuassag (aonepesaap jo alejuassed) % —_ adueys qriuans xeu OF apsuay Jo aBequa.s9g or +o o1— adueys ssoupiey % aiueys peor soueysisar pinta et +108 st + oer aumpoa Jo eBequsos9q °F YIM soweps0s08 Uy WTF 02 ‘0.8 ¥ 0ST UT OL 0.8 = 081 | () oun pue oammmsoduiag, | eouersiser pig payesoued oq wou [jeys HORI ‘aquys oo1asos oy 07 yUNYS 10 popuEdxo uaYa ‘ZBAIOW ‘uOTSOUpE oq ByJeUIOS 9g you [TRYS 70K, amg (wonepeatiap 50 oeyuaazed) % asueyo “xem op] Worresuoy Jo aSequaoieg (wonepeailep jo aeyua010d) % aduvya yisuens “xeu OF ‘ap suai Jo aBequaDIg “3807 sourrsisor Buysiy ort — edunyp ssoupaeyy 2° WIE souepaos9e Uy WTF 04 (0,2 = OST UTS 02 ‘9.2 Fost | () auM pue amnyesoduay, | sounystsor Sindy uw ogg | % uoneSu0( 3901 ones Kz0UspI TP Haim sounpacao” uy ut O'S Pa Widuons opsuog 9 ¥ 09 10 ¢ F 08 ssoupieEy ares AuBUrpiQ poyjour soy, godky, | T edky wOHwaYISELID way] D 2611-1995 2 syooq Jo aoueuuoyzag °Z a[QR,D 2611-1995, 897 oouwystsax 24070) “wonwoyiuseur om} Jo seu[3 SurAjruseur Aq pouryuos aq uB9 7B} yIeI9 oy} Jo LoNVeIIUES ayy aq JOU [[eYS o04T, ams 5 g-st (oneys) uoneBuolg, WTF OL ‘0.3 F oF ( ouin puw ammyereduieg, umydd 6'F WyUM oaUepI0008 Up 9=09] — G) wonexqUasU09 euozg | aouess}s0s ou0zo % reas aso} wrens xew ¢@ xew of] Tusueurzed uorssordwog Sie quousuuiod uorssaxdw09 quoweurod 8 Uya oowepz0.9" Ul WTF o6 ‘0.8 F 09 UTF 2 ‘0.6 F O81] Geum pue ounyezoduey, | uoIBso4duI0D “xeur ¢z| % woneducye wueuwusog 3801 eo oreo} uoneduop quoupuiog ot ® () Sonesuorg uonesuo|9 2 tm goueps0998 Uy WTF 02 ‘0.8 5 0st U1 = 040.2 F o2t| (4) um pue ainaeoduiay,| juouvmuag _ Uru T UNyHM adwys [PUEBLO ayy a uunp9d [TeYs s300q 9M pu ye aq Jou [TeYs O10) ° ‘murpuog sumyesoduioy mort |__242 OMX [EUS si00q ox puE >>e29 94 YOU TTEYS 9404, ves — 9°F YIM aouEpsosoe Uy ULF 2e ‘0.0 = OF -| (9 2m puw omquseduray, aanjeseduiay MoT "1801 AanqerZOm, aanqeseduia) Moy °F AEM oouEpso99R UT ‘paywsoUES oq you [Toys y9"s0 ‘saplsagq ‘a8 “uoysid ‘repurfao Jo sized Zuytjeasus| ayy Wo4y pasowias aq you [TeYs syo0q ayy 4893 ay BULAN aig UT FOL 0,8 F OF () omy pur amyesoduy, qe yION aunqerodmay mor ys01 Ayrntqeyzom aanqex 03 USE ‘souaa9]194U go syed Au wos aABY [[RYS “m9 “Uoysid “sapuyyAo| ISUT Oyy PUR y9BIO oq Jou TTeYS a0yI, aes AVqeysOM aang FF YIM oouepz0s08 UT UT #02 ‘0.8 = OST TF 020.9 F o@t| () eum pue ommpereduay | -eradmer you @ ade, 7 adky powrou asa, WOR ROUISSeID mary (panuyuos) -z a1quy,4 D 2611-1995 “aouasayad aAnyvULosUt 10y UMOYS are “y UL payloads suoyyrpuos 4sa3 ayy, (;) a10N "3803 aouey, -s18a4 uoyiwoulzad 970, OT'F YIM aouRpsos9e Uy “81009 Jo eaood ayy ydaoxa uauTmads| 24} JO apisur s9,eM JO uOROWLEd ou oq [[eys azoys, ors 08 + 00g war 6) 4adop 29784 UT FOL ‘0.9 = 0st ULF 02 ‘0.9 ¥ Oat () Buse 3294 30 own pure amyesoduay, aousysisar wore -sundod 407104) pousour 3807, zadiy, Tadey, uorrwayisseig, (panunuos) -Z a1qey,4. 41 41. 5 D 2611-1995 Performance test methods Ordinary state test Specimen _The specimen shall be the product or the test piece shown below: @ (2) (3) 4.1.2 @ (2) 4.138 q) @) 414 qa) (2) ‘The test piece shall be taken from the vulcanized plate manufactured under the same condition as in the product. The specimen used in measuring the hardness shall be the piece cut from the product or test piece conforming to JIS K 6253. The test pieces used in measuring tensile strength and elongation shall be three No. 3 dumbbell specimens specified in 4. of JIS K 6251. Testing apparatus The testing apparatus shall be as follows: Hardness tester __ the hardness tester shall be the Type A durometer specified in 5. of JIS K 6253. The microtester specified in 4, of JIS K 6253 may be used on the basis of the agreement between the parties concerned. Tensile tester The tensile tester shall be that specified in 3. of JIS K 6251. ‘Test method The test method shall be as follows Measurement of hardness The measurement of hardness shall be in accordance with 5. of JIS K 6253, or according to the agreement between the parties concerned, with 4. of JIS K 6253. Measurement of tensile strength and elongation The measurement of tensile strength and elongation shall be in accordance with 5. of JIS K 6251. Calculation The calculation shall be as follows: Tensile strength The tensile strength shall be calculated by the follow- ing formula: _ Ps Tea where, Tn : tensile strength (MPa) Fs : maximum tensile force (N) A: cross section area of test piece (mm*) Elongation The elongation shall be calculated by the following formula: Bye Ele x 1006 D 2611-1995 where, Ey : elongation (%) Ly : reference length (mm) Ly : reference length at the time of breaking (mm) 4.1.5 Method for completion of test result ‘The method for completion of test result shall be as follows: (2) Hardness ‘The hardness shall be expressed by the integer places of the median (°) of five measured values by rounding off in accordance with JIS Z 8401. (2) ‘Tensile strength ‘The tensile strength shall be expressed by three places of significant numerical value by rounding off in accordance with JIS Z 8401, the median (®) of each value resulted from the calculation in 4.1.4 (1) after testing three test pieces. (3) Elongation The elongation shall be expressed by two places of significant numerical value by rounding off in accordance with JIS Z 8401, the median (*) of each value resulted from the calculation in 4.1.4 (2) after testing three test pieces. Note () When placing the numerical values in a line in the order from large value, the value that falls on the middle digit when the values consist of odd number and the average value of two digits put on both sides of the middle when consisting of even number. 4.2 Aging resistance test 42.1 Specimen The specimen shall be in accordance with 4.1.1, 4.2.2 Test condition ‘The test condition shall be as shown in Table 3. ‘Table 3. Aging resistance test condition Se, Classification | Test temperature °C Test time h Type 1 120+2 41 Type 2 150 +2 42.8 Test method The test shall be carried out under the condition shown (1) Measurement of hardness After measuring the hardness before the test by the method in 4.1.3 (1), test the specimen in accordance with 4. of JIS Z 6257, and after the test, measure the hardness by the method in 4.1.3 (1). (2) Measurement of tensile strength and elongation Test the specimen in accordance with 4. of JIS K 6257, and after the test, measure the tensile strength and elongation by the method in 4.1.3 (2).(3) 4.2.4 a (2) 42.5 7 1D 2611-1995 State After aging, observe visually the state of surface of specimen and examine whether there are adhesion and other abnormality. In addition, examine visually whether there is the generation of crack or not when the specimen is expanded or shrunk approximately to the state of service. Calculation The calculation shall be as follows: Change of hardness The change of hardness shall be calculated by the allowing formula: Au =H ~ Ho where, Ay : change of hardness Hy + hardness before the test H, : hardness after the test Percentage of tensile strength change and percentage of elongation change ‘The percentage of tensile strength change and the percentage of elongation change shall be calculated by the following formula: where, Ac : percentage of tensile strength change (%) or percent of elongation change (%) Xp : median (°) of tensile strength (MPa) or elonga- tion (%) before the test. In the case of the same lot, the value obtained in 4.1 may be used, X, : median (*) of tensile strength (MPa) or elonga- tion (%) after the test ‘Method for completion of test results The method for completion of test results shall be as follows: @ (2) 43 4.3.1 Change of hardness ‘The change of hardness shall be expressed by the integer places of the value resulted from the calculation in 4.2.4 (1) after obtaining the hardness before and after the test in accordance with 4.1.5 a. Percentage of tensile strength change and percentage of elongation change The percentage of tensile strength change and the percentage of elongation change shall be expressed by the integer places of the value resulted from the calculation in 4.2.4 (2) after rounding off in accordance with JIS Z 8401 Fluid resistance test Specimen ‘The specimen shall be as follows:8 D 2611-1995 qa) (2) 4.3.2 a (2) 4.3.3 ‘The specimens used in measuring the hardness, and the tensile strength and elongation shall be in accordance with 4.1.1. ‘The specimen used in measuring the change of volume shall be three pieces of 3 g cut off from the product, In the case of the product not more than 3 g, the specimen shall be three products. Testing apparatus The testing apparatus shall be as follows: Thermostat. The thermostat shall be capable of keeping the test tem- perature during the test time shown in Table 4. Test container The test container shalll be that specified in 6.3.2 of JIS D 2605. Test condition The test condition shall be as shown in Table 4. ‘Table 4, Fluid resistance test condition Classification | Test temperature Tost time h ‘Test uid % The fluid conforming to JIS K Tepes Ta) Re 701 | 9938 or the fluid specified in the agreement between the parties ‘Type 2 ABO 4 concerned, (2) (3) (4) ‘The test method shall be as follows: Cleaning of specimen After washing the specimen with isopropyl alcohol or ethyl alcohol (hereafter both of them are referred to as "alcohol’) to remove attached stain, test fluid, ete., wipe the alcohol away by dry cloth. When washing the specimen with alcohol, it shall not be dipped in alcohol for 30 s or more. Immersion test Put the specimen into a weighing bottle, add 75 ml of lest fluid, cover it and place it in a pressure vessel. Seal tightly the cap of pressure vessel and keep it in the thermostat regulated at the test tem- perature shown in Table 4 for the duration of test time. After finishing the immersion, dip the specimen in the new test fluid (room temperature) of the same kind for about 30 min to cool down to the room temperature. Measurement of volume change After washing the specimen by the ‘method in (1), weigh its mass in the air to the nearest 1 mg, and after measuring the virtual mass in distilled water of room temperature, wash again by the method in (1). Suecessively carry out the immersion test by the method in (2), weigh the mass of specimen in the air immediately after washing by the method in (1), and furthermore, measure the virtual mass in the distilled water of the room temperature. Measurement of hardness Measure the hardness before the test by the method in 4.1.8 (1), carry out the immersion test of the specimen by the method in (2), and after washing by the method in (1), measure the hardness by the method in 4.1.3 (1).(5) (6) 4.3.5 @ 2) (3) 9 D 2611-1995 Measurement of tensile strength and elongation _ Carry out the immer- ssion test of the specimen by the method in (2), and after washing by the method in (1), measure the tensile strength and elongation by the method in 4.1.3 (2). State After the immersion test, observe visually the state of surface of specimen and examine whether there are blister and peeling Remarks 1, Measurement and observation in (3), (4), (5) and (6) shall be carried out within 60 min after washing by alcohol following the finish of immersion test. 2. (8), (4) and (6) are allowed to be carried out by using the same specimen. Calculation ‘The calculation shall be as follows: Percentage of volume change _The percentage of volume change shall be calculated by the following formula: AV ig = {Mis = Ma) = (rma = ma) 199 (my = ms) where, AVio : percentage of volume change (%) m, : mass in the air before immersion (g) ‘mz : virtual mass in water before immersion (g) ms : mass in the air after immersion (g) ms : virtual mass in water after immersion (g) Change of hardness ‘The change of hardness shall be calculated by the following formula: Cu = Hi - Ho where, Cu : change of hardness Hy : hardness before the test Hy : hardness after the test Percentage of tensile strength change and percentage of elongation change ‘The percentage of tensile strength change and the percentage of elongation change shall be calculated by the following formula: jp — Sa Sa x 100 where, Sc : percentage of tensile strength change (%) or percentage of elongation change (%) median (°) of tensile strength (MPa) or elonga- tion (%) before the test. In the case of the same lot, the value obtained in 4.1 may be used. Ss: median (®) of tensile strength (MPa) or elonga- tion (%) after the test Sa10 D 2611-1995 Method for completion of test results The method for completion of test (1) Percentage of volume change —_The percentage of volume change shall be expressed by the integer places of the median (*) of the value resulted from the calculation in 4.3.5 (1) by rounding off in accordance with JIS Z 8401. (2) Change of hardness ‘The change of hardness shall be expressed by the integer places of the value resulted from the calculation in 4.3.5 (2) after obtaining the hardness before the test in accordance with 4.1.5 (1). (3) Percentage of tensile strength change and percentage of elongation change ‘The percentage of tensile strength change and the percentage of elongation change shall be expressed by the integer places of value resulted from the calculation in 4.3.5 (3) by rounding off in accordance with JIS Z 8401. The cross section area to be used when obtaining the tensile strength after the test shall be the cross section area before the test. 4.4 High temperature workability test 44.1 Specimen The specimen shall be the product. 44.2 ‘Testing apparatus ‘The testing apparatus shall be in accordance with 5.9.2 of JIS D 2609. 4.4.3 Test condition The test condition shall be as shown in Table 5, Table 5, High temperature workability test condition Classification |Test temperature] ‘Test time Stroke num- | Hydraulic pressure ber/hour “ h (times/hour) Type 1 12045 7041 1000+ 100 | 7+ 0.3 MPa or the hydraulic pressure — specified by the Typea Tas te arte ara Remarks: The cylinder hydraulic fluid shall be the fluid conforming to JIS K 2233 or the fluid specified by the agreement between the parties concerned. 4.4.4 Test method The test method shall be as follows: (1) Assemble the specimen to a caliper assembly and operate for the specified time under the condition specified in Table 5. As for the thickness of pad to be used, select one or two conditions from the conditions of new article, half wear state and whole wear state in accordance with the agreement between the parties concerned. (2) After the operation, take the specimen away from the thermostat and allow it to stand as it is for 24 + 1 h at the room temperature to cool it.ul D 2611-1995 (3) After cooling, examine visually whether there is crack or about the state of appearance. Examine moreover the interference of the installing parts of cylinder, piston, ete. 4.5 Low temperature workability test 4.5.1 Specimen The specimen shall be the product. 4.5.2 Testing apparatus The testing apparatus shall be in accordance with 5.9.2 of JIS D 2609. However, the thermostat shall be able to maintain the calliper assembly at the test temperature shown in Table 6. 4.5.3 Test condition The test condition shall be as shown in Table 6. Table 6. Low temperature workability test condition ar Classifi- | Low temperature standing Low temperature working cation Test tompe- | Test time | Working | Working | Hydraulic pressure rature intervals | frequency 6 h (times/90 8) | (times) 7 £03 MPa or the Typel | -4022 | 7021 ' 8 hydraulic pressure specified by the 2 agreement between ‘Type the parties concerned. Remarks: The cylinder hydraulic fluid shall be the fluid conforming to JIS K 2233 or the fluid specified by the agreement between the parties concerned. 4.5.4 Test method The test method shall be as follows: (1) Assemble the specimen to a calliper assembly and allow it to stand in the thermostat under the condition of low temperature standing shown in Table 6. As for the thickness of pad to be used, select one or two conditions from the conditions of new article, half wear state and whole wear state in accordance with the agreement between the parties concerned. (2) After allowing to stand, operate under the condition of low temperature working shown in Table 6 in the same low temperature atmosphere and observe the working state to examine installing parts to the cylinder, piston, ete. (3) Take the calliper assembly away from the thermostat and allow it to stand for 24+ 1h at room temperature. After allowing to stand, examine visually whether there is crack and the state of appearance of the specimen. 4.6 Low temperature bending test 46.1 Specimen The specimen shall be the product.12 D 2611-1995 4.6.2 Testing apparatus The low temperature chamber used in the test shall be able to maintain the test temperature shown in Table 7 for the duration of test time, 4.6.3 Test condition ‘The test condition shall be as shown in Table 7. Table 7. Low temperature bending test condition Classification Low temperature standing Low temperature bending Test temperature | ‘Test standing time | Bending frequency fa h (times) ‘Type 1 4042 2+ 1 ‘Type 2 4.6.4 Test method After allowing to stand for the test time at the test tem- perature specified in Table 7, bend the specimen in the low temperature chamber as shown in Fig. 1, remove immediately external force and measure the time required for returning approximately to the original shape. Successively, return it to room temperature and examine visually whether there is crack on the speci- men, When bending the specimen, wear gloves in order to prevent heat transfer from fingers. Fig. 1. Bending of boots Ca WZ aa | co 4.7 Permanent elongation test 4.7.1 Specimen The specimen shall be three products. 4.7.2 Testing apparatus The testing apparatus shall be as follows: (1) ‘Thermostat The thermostat shall be able to maintain the temperature shown in Table 8.13 D 2611-1995 (2) Mandrel The mandrel shall be of the diameter of 1.15 times the dia- meter of the installing part to the cylinder, piston, ete. of the specimen. In addition, the mandrel shall have the guide chamfer so as not to damage the specimen, be of the shape not to generate abnormal deformation such as twisting and of the ground surface. 4.7.3 Test condition The test condition shall be as shown in Table 8, Table 8. Permanent elongation test condition Classification PFest temperature Test time Elongation: c h % Type 1 12022 To#1 58 ‘Type 2 150 +2 4.7.4 Test method The test method shall be as follows: (1) Measure in advance the dimension of internal diameter of the installing part to the cylinder, piston, ete. of the specimen. The internal diameter shall be the average value of readings in two directions perpendicular to each other. (2) Assemble the specimen to the mandrel specified in 4.7.2 (2) and maintain it for the test time and at the test temperature specified in Table 8. (3) After taking away from the thermostat and cooling for one hour at the room temperature, remove the specimen from the mandrel. Then, after standing for 30 min to 1 h, measure the internal diameter of the specimen in the same way as in (1). 4.7.5 Calculation The permanent elongation shall be calculated by the fol- lowing formula: Did, “1 where, Dx: permanent elongation (%) di : internal diameter of boot before the test (mm) d, : internal diameter of boot after the test (mm) Dy ; diameter of mandrel (mm) 4.7.6 Method for completion of test results The permanent elongation shall be expressed by the integer places of the average value of the values obtained from three specimens by rounding off in accordance with JIS Z 8401. In the case where each value of three specimens does not coincide within 10 % of the average value, carry out further the test using another three specimens and take the median (*) of the values of all six specimens as the permanent elongation,4 D 2611-1995 4.8 Compression permanent strain test 4.8.1 Test pieces The test pieces shall be as follows: (1) Three test pieces shall be taken from the vulcanized plate manufactured under the same condition as in the product. (2) The shape of test piece shall be the large size test piece specified in 5.3 of JIS K 6262. 4.8.2 Test condition The test condition shall be as shown in Table 9. Table 9. Compression permanent strain test condition Classification |Test temperature “C| Test time _h ‘Type 1 12042 2241 Type 2 150 +2 48.8 ‘Test method The test shall be carried out under the condition in Table 9 in accordance with 5. of JIS K 6262. 48.4 Calculati | ‘The compression permanent strain shalll be calculated by the following formula: Cy = t= x 100 to= te where, Cs : compression permanent strain (‘%) to : original thickness of test piece (mm) ty : thickness of test piece 30 min after taking from the compressive apparatus (mm) tz! thickness of spacer (mm) 4.8.5 Method for completion of test results The compression permanent strain shall be expressed by the integer places of the average value of the values obtained from three test pieces, by rounding off in accordance with JIS Z 8401. In the case where each value of three test pieces does not coincide within 5 % of the average value, carry out further using another three test pieces and take the median (*) of the values of total six specimens as the compression permanent strain. 4.9 Ozone resistance test 4.9.1 Specimen The specimen shall be the product. 4.9.2 Test condition The test condition shall be as shown in Table 10.15 D 2611-1995 Table 10. Ozone resistance test condition Classification | Test tempera- | Test time | Ozone concent: | Elongation ture ration (static) te h pphm % ‘Type 1 40 +2 TO+1 5045 163 Type 2 4.9.3 Test method Assemble the specimen to the mandrel specified in 4.7.2 (2), carry out the test in accordance with 4. of JIS K 6259 under the condition shown in Table 10, and examine using a magnifying glass of two magnifications whether there is crack or not. 4.10 Water permeation resistance test 4.10.1 Specimen The specimen shall be the product. 4.10.2 Testing apparatus ‘The testing apparatus shall be as follows: The outline of the testing apparatus is shown in Fig. 2. (2) Pressurizer The pressurizer shall be in accordance with 5.8.2 (1) of JIS D 2609. (2) Fixing jig The fixing jig shall be in accordance with 5.7.2 (2) of JIS D 2609. (3) Thermostat ‘The thermostat shall be able to maintain the calliper assem- bly at the test temperature shown in Table 11, (4) Water chamber The water chamber shall be able to keep the calliper assembly at the water depth of 300 + 30 mm, Fig. 2. Outline of water permeation resistance testing apparatus (example) _y Pressure gauge a - Master cylinder Calliper 2 Water chamber assembly “|| xxl16 D 2611-1995 4.10.3 Test condition ‘The test condition shall be as shown in Table 11. Table 11. Water permeation resistance test condition Classifi- Heat aging Working in water cation Test tem-| Test | Water | Stoke | Working | Hydraulic pressure perature | time depth | pumber’ | frequency a h mm —_|(timesour)| (times) 3.5 + 0.3 MPa or the ‘Type 1 120+ 5 +1 300 + 30/1000 + 100) 500 hydraulic pressure specified hy the agreement between ‘Type 2 150 +5 ‘the parties concerned, Remarks: The cylinder hydraulic fluid shall be the fluid conforming to JIS K 2233 or the fluid specified by the agreement between the parties concerned. 4.10.4 Test method —_The test method shall be as follows provided that the thickness of pad be in accordance with 4.4.4 (1): (1) Assemble the specimen to the calliper assembly. Measure in advance when necessary the dimension of seal portion of the specimen. (2) Fix the calliper assembly to each fixing jig and extract air thoroughly. (3) Apply a hydraulic pressure of 8.5 + 0.3 MPa and regulate the position of axial direction relation between the pad and the piston to become the state equivalent to that of actual automobile. (4) Put the calliper assembly in the thermostat and keep it under the condition of heat aging in Table 11. If it is impossible to make wiring and put into thermostat, the wiring may be removed. (5) Put it away from the thermostat and allow it to stand in the room to return down to ordinary temperature. (6) Put the calliper assembly in the water chamber as shown in Fig. 2 (7) Operate the calliper assembly under the condition of working in water shown in Table 11 (8) Take the calliper assembly away from the water chamber and wipe completely the water content adhered to its outside. (9) Remove the specimen and examine the state of water permeation inside of the specimen. 5. Storage — When boots are stored, they shall be packaged in accordance with the method agreed upon between the parties concerned with delivery and handled under the following conditions: (1) Boots shall not be let to stand at the temperature and the humidity considered harmful.li. D 2611-1995 (2) Boots shall not be exposed to the direct rays of the sun, harmful ultraviolet radiation and detrimental gas. (3) Boots shall not be let to stand as external force likely to deform the boots is loaded on the boots. 6. Marking Boots or the package shall be marked on the part easy to be seen by an indelible method with the following items: (1) Manufacturer's name or abbreviation (2) Year and month of manufacture or their abbreviationD 2611-1995 Ed Japanese Text Established by Minister of International Trade and Industry Date of Establishment: 1984-04-01 Date of Revision: 1995-02-01 Date of Public Notice in Official Gazette: 1995-02-01 Investigated by: Japanese Industrial Standards Committee Divisional Council on Aircraft and Automobiles ‘This English translation is published by: Japanese Standards Association 1-24, Akasaka 4, Minato-ku, ‘Tokyo 107 Japan © JSA, 1995 Printed in Tokyo by Hobbunsha Co,, Li.