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Basic data
| Standard ID | GB 29334-2012 (GB29334-2012) |
| Description (Translated English) | [GB/T 29334-2012] Elastomeric cups and seals for cylinders for hydraulic braking systems using a non-petroleum base hydraulic brake fluid |
| Sector / Industry | National Standard |
| Classification of Chinese Standard | G43 |
| Classification of International Standard | 83.140.50; 43.040.40 |
| Word Count Estimation | 21,236 |
| Quoted Standard | GB/T 528; GB/T 531.1; GB/T 1690; GB/T 2828.1; GB/T 3512; GB/T 3672.1; GB/T 5721; GB/T 6031; GB/T 7758; GB/T 7759; GB 12981; QC/T 311-2008 |
| Adopted Standard | ISO 4928-2006, MOD; ISO 6118-2006, MOD |
| Regulation (derived from) | National Standards Bulletin No. 41 of 2012 |
| Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China |
| Summary | This Chinese standard relates to non- petroleum base hydraulic brake fluid automotive hydraulic brake cylinder cups and lips with elastomer seals (hereinafter referred to as the seal) the terms and definitions, general requirements, product requirements, |
GB 29334-2012: [GB/T 29334-2012] Elastomeric cups and seals for cylinders for hydraulic braking systems using a non-petroleum base hydraulic brake fluid
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Elastomeric cups and seals for cylinders for hydraulic braking systems using a non-petroleum base hydraulic brake fluid
ICS 83.140.50; 43.040.40
G43
National Standards of People's Republic of China
Non-petroleum base hydraulic brake fluid for hydraulic vehicle brake
Cylinder with elastomeric cups and seals
[ISO 4928.2006, Roadvehicles-Elastomericcupsandsealsforcylinders
brakefluid (servicetemperature120 ℃ max), MOD
ISO 6118.2006, Roadvehicles-Elastomericcupsandsealsforcylinders
brakefluid (servicetemperature70 ℃ max), MOD]
Published 2013-10-01 2012-12-31 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China issued
Table of Contents
Introduction Ⅲ
1 Scope 1
2 Normative References 1
Terms and definitions 1 3
4 General requirements 2
4.1 Category 2
The physical properties of rubber claim 2 4.2
The appearance and quality of the finished size 4.3 3
5 finished claim 3
Liquid at a high temperature resistant 3 5.1
5.2 precipitation 3
5.3 thermocompression stroke cylinder seals Test 3
5.4 pressing stroke of the master cylinder seal tests 4
5.5 low temperature performance 5
Hot air aging 5.6 5
Metal corrosion 5.7 5
5.8 Storage corrosion 6
5.9 Work durability 6
6 Test Procedure 6
High temperature resistant liquid at 6.1 Test 6
6.2 precipitation test 7
6.3 thermocompression stroke cylinder seals Test 8
6.4 Test pressing stroke of the master cylinder seal 9
6.5 low temperature performance test 11
12 6.6 Hot air aging test
6.7 Determination of hardness 12
13 6.8 Metal corrosion test
Storage 15 6.9 Corrosion Test
Work durability test 15 6.10
7 Inspection rules 15
7.1 factory inspection 15
16 7.2 Type inspection
8 signs, packaging, transportation and storage 16
8.1 Marking 16
8.2 Packaging 16
Transport and storage 16 8.3
Foreword
Chapter 5 of this standard is mandatory, the rest are recommended.
This standard was drafted in accordance with rules GB/T 1.1-2009 given.
This draft standard method using the reformed modified using ISO 4928.2006 "Road vehicles for non-petroleum base hydraulic braking hydraulic brake fluid
An elastomeric cup seal member and the cylinder actuator system (maximum operating temperature of 120 ℃) "and ISO 6118.2006" Road vehicles for non-petroleum
An elastomeric cup seal member and the cylinder base hydraulic brake system hydraulic brake fluid (the maximum operating temperature of 70 deg.] C). "
This standard and ISO 4928.2006 and ISO 6118.2006 and the main technical differences for the following reasons.
--- About normative references, this standard has been adjusted with a technical differences, in order to adapt to the technical conditions of our country, the adjusted situation
Status reflects in Chapter 2, "normative references", specifically adjusted as follows.
● using the equivalent to international standards GB/T 3512 instead of the ISO 188.1998 (see 6.1.1.4,6.2.1.3,6.3.1.1,
6.4.1.1,6.6.1,6.8.1.1);
● equivalents adoption of international standards GB/T 6031 instead of ISO 48 (see 6.7.1,6.7.2);
● modified with international standards of GB 12981 instead of ISO 4925 (see 6.1.3.5,6.2.3.1,6.3.3.5,
6.4.3.4,6.5.1.3.1,6.8.3.3,6.9.3.2);
● Remove the ISO 4926;
● increased cited GB/T 528 (see Table 1), GB/T 531.1 (see Table 1 and 6.7.2), GB/T 1690 (see Table 1),
GB/T 2828.1 (see 7.1.2.2), GB/T 3672.1 (see 4.3), GB/T 5721 (see 8.3), GB/T 7758 (see
Table 1), GB/T 7759 (see Table 1), QC/T 311-2008 (see 6.10);
--- In order to distinguish different maximum seal temperature, increasing the classification, and the seal member to increase the maximum operating temperature of 150 deg.] C
Material (see 4.1);
--- In order to facilitate the quality control in the production process of the sealing member, increasing the rubber physical property requirements (see 4.2);
--- In order to adapt our standard system, the brake fluid from the test line with ISO 4926 was changed to meet the requirements of GB 12981
Request (see 6.1.3.5,6.2.3.1,6.3.3.5,6.4.3.4,6.5.1.3.1,6.8.3.3,6.9.3.2);
--- For a more comprehensive characterization of the performance of the seal, increasing the service durability requirements (see 5.9) and the operating endurance test procedure (see 6.10);
--- In order to distinguish different maximum temperature seal, 6.1.3.5 "into container 120 ℃ ± 2 ℃ aging chamber for 70h ± 2h"
(See ISO 4928.2006) and "vessel was placed 70 ℃ ± 2 ℃ aging tank 120h ± 2h" (see ISO 6118.2006), to
"Class A vessel containing the material was placed in 70 ℃ ± 2 ℃ aging tank (6.1.1.4) in 120h ± 2h; vessel equipped with a Type B material into
120 ℃ ± 2 ℃ aging chamber for 70h ± 2h; vessel equipped with a material placed in Class C 150 ℃ ± 2 ℃ aging chamber for 70h ± 2h ";
--- To state more clearly, change the size of the result is represented by a text description instead formulated (see 6.1.4.2);
--- For ease of understanding and use different temperatures to distinguish the highest seal, precipitation test instrument formula centrifuge speed increases (see
6.2.1.4); different test procedures described in the precipitation experiment, different materials and different aging time and temperature (see 6.2.3),
Increase ratio calculated precipitated (see 6.2.4);
--- In order to distinguish different maximum temperature seal, 6.3.3.6 "stroke device assembly into the aging tank, ± 2 ℃ at 120 ℃
Start at 70h ± 2h "(ISO 4928.2006) and" stroke of the aging device assembly into the box, starting at 70 ℃ ± 2 ℃
120h ± 2h "(ISO 6118.2006), the words" the stroke device assembly into the aging tank, for the A-based material, the temperature aging box
Was 70 ℃ ± 2 ℃, time of 120h ± 2h; Class B materials, the aging oven temperature was 120 ℃ ± 2 ℃, time 70h ±
2H; C for material type, aging oven temperature was 150 ℃ ± 2 ℃, time 70h ± 2h ";
--- In order to distinguish different maximum seal temperature, paragraph 5 "master cylinder 6.4.3 accumulated liquid temperature should be maintained at
120 ℃ ± 2 ℃ "(ISO 4928.2006)," the liquid accumulated in the master cylinder temperature should be maintained at 70 ℃ ± 2 ℃ "(ISO 6118.
2006) to 6.4.3.5, "A class of materials for the master cylinder accumulated liquid temperature should be maintained at 70 ℃ ± 2 ℃, Class B
Material, the liquid temperature should be maintained at 120 ℃ ± 2 ℃, materials for class C, the liquid temperature should be maintained at 150 ℃ ± 2 ℃ ";
--- In order to distinguish different maximum seal temperature, paragraph 6, "6.4.3 ± master cylinder assembly at a temperature of 120 deg.] C to 2 ℃
(0.28 ± 0.03) Stroke/s [(1000 ± 100) Stroke/h] at a rate of run 70h ± 2h "(ISO 4928.2006) and" master cylinder
Assembly to (0.28 ± 0.03) Stroke/s [(1000 ± 100) Stroke/h] 120h running at a rate of temperature of 70 ℃ ± 2 ℃
± 2h "(ISO 6118.2006), to 6.4.3.6" A master cylinder assembly for a class of materials at 70 ℃ ± 2 ℃, to (0.28 ±
0.03) Stroke/s [(1000 ± 100) Stroke/h] at a rate of operation 120h ± 2h. Master cylinder assembly Class B material at ± 120 ℃
At 2 ℃, to (0.28 ± 0.03) Stroke/s [(1000 ± 100) Stroke/h] Rate Run 70h ± 2h. The main class C material
Cylinder assembly at 150 ℃ ± 2 ℃, to (0.28 ± 0.03) Stroke/s [(1000 ± 100) Stroke/h] 70h ± run at a speed
2h ";
--- In order to distinguish different maximum seal temperature, paragraph 6.4.3 6 "and the last stroke of 1.6mm ~ 3.2mm in
During gradually pressurized to 3.5MPa ± 0.3MPa, so that the whole stroke to reach Ping Heng. "(ISO 4928.2006) and" and stroke
The final boost phase during 1.6mm ~ 3.2mm to 7MPa ± 0.3MPa, so that the whole stroke to reach Ping Heng. "
(ISO 6118.2006), to 6.4.3.6 "and the last stroke of 1.6mm ~ gradually pressurized during 3.2mm, A Class Material
Feeding pressurized to 3.5MPa ± 0.3MPa, Class B and Class C material was pressurized to 7MPa ± 0.3MPa, the whole stroke to reach the level
Balance ";
--- In order to distinguish different maximum seal temperature, paragraph 6.6.3 of 3 "at 120 ℃ ± 2 ℃ by hot air aging 70h ±
2H "(see ISO 4928.2006) and" 120h ± 2h aged by hot air at 70 ℃ ± 2 ℃ "(ISO 6118.2006), to
6.6.3.3 "Class A material for aging oven temperature was 70 ℃ ± 2 ℃, time of 120h ± 2h; Class B materials, the oven temperature aging
Degrees 120 ℃ ± 2 ℃, time 70h ± 2h; C for material type, aging oven temperature was 150 ℃ ± 2 ℃, time 70h ±
2h;
--- As the ISO 4928.2006 and ISO 6118. 6.7 representations in 2006 is unclear, poor operability, restated to 6.7,
And increment the reference measuring method GB/T 531.1 Shore A hardness;
--- In order to distinguish different maximum seal temperature, paragraph 6.8.3 of the 4 "placed in the container ± 2 ℃ aging tank holding 100 ℃
120h ± 2h "(ISO 4928.2006) and" maintaining 120h ± 2h placing the vessel 70 ℃ ± 2 ℃ aging tank "(ISO 6118.
2006), to 6.8.3.4 "Class A material for the glass container into aging tank 70 ℃ ± 2 ℃ aging 120h ± 2h; for
Class B and C-based material, the glass container is placed in a 100 ℃ ± 2 ℃ aging aging tank 120h ± 2h ";
--- For ease of understanding, the test procedure in increased metal corrosion illustration, see 6.8.3.2 and 6.8.3.3 in FIG. 4 in FIG. 5;
--- Taking into account China's actual situation, to ISO 4928. 6118 2006 and ISO . 4.4 in 2006 have been adjusted and modified by
Plus specific provisions factory inspection and type test and adjust to Chapter 7, "Inspection Rules";
--- taking into account the actual situation in China, an increase of 8.3 transport and storage.
ISO 4928.2006 and ISO 6118.2006 the text in exactly the same structure, and the present standard ISO 4928.2006 and ISO 6118.
Restructuring 2006 is as follows.
The ISO 4928.2006 and ISO 6118.2006 in the 4.1, 4.3 of this standard adjustment;
The ISO 4928.2006 and ISO 6118.2006 is 4.2, 8.1 of this standard adjustment;
The ISO 4928.2006 and ISO 6118.2006 is 4.3, 8.2 of this standard adjustment;
The ISO 4928.2006 and ISO 6118.2006 in 4.4, adjusted Chapter 7 of this standard;
This standard also made the following editorial changes. The "This standard" instead of "this International Standard."
The standard proposed by China Petroleum and Chemical Industry Federation.
This Standards Technical Committee (SAC/TC35/SC3) rubber and administered by the National Technical Committee of Standardization sealing rubber article points.
This standard was drafted. Guizhou public Rubber Co., Ltd. Anhui Ding seals, rubber, plastics Design northwest
Hospital, Zhuzhou Times New Material Technology Co., Ltd.
The main drafters. Manning, Yan Jiangwei, Cai Peiliang, high Leong, Wang Jin, Zhan Wei, Xu Zhizhong, Yuan Yuhu.
Non-petroleum base hydraulic brake fluid for hydraulic vehicle brake
Cylinder with elastomeric cups and seals
1 Scope
This standard specifies the vehicle hydraulic brake cylinder for non-petroleum base hydraulic brake fluid elastomeric cups and seal lips (hereinafter referred to as
Sealing member) terms and definitions, general requirements, requirements, test procedures, test rules finished, signs, packaging, transportation and storage.
This standard applies to the rubber seal molding drum brake cylinder with a diameter of not more than 60mm.
This standard is not for a disc brake with an elastomeric seal.
2 Normative references
The following documents for the application of this document is essential. For dated references, only applies to the version dated paper
Pieces. For undated references, the latest edition (including any amendments) applies to this document.
Determination GB T 528/vulcanized rubber or thermoplastic rubber tensile stress - strain properties (GB/T 528-2009, ISO 37.2005, IDT)
GB/T 531.1 vulcanized rubber or thermoplastic rubber indentation hardness testing method of Part 1 Method Shore Hardness (Shore hard
Degree) (GB/T 531.1-2008, ISO 7619-1.2004, IDT)
GB/T 1690 Rubber, vulcanized or thermoplastic liquid resistant test methods (GB/T 1690-2006, ISO 1817.2005, MOD)
GB/T 2828.1 Sampling procedures - Part 1. press-batch inspection sampling plan reception quality limit (the AQL) search
(GB/T 2828.1-2012, ISO 2859-1.1999, IDT)
GB/T 3512 Rubber, vulcanized or thermoplastic hot air aging and the accelerated heat resistance test (GB/T 3512-2001, eqvISO 188.
1998)
GB/T 3672.1 rubber tolerances - Part 1. dimensional tolerances (GB/T 3672.1-2002, ISO 3302-1.1996,
IDT)
GB/T 5721 rubber seal marking, packaging, transportation, storage general provisions
GB/T 6031, vulcanized or thermoplastic - Determination of hardness of rubber (10 ~ 100IRHD) (GB/T 6031-1998, idtISO 48.
1994)
GB/T 7758 vulcanized rubber low temperature performance measured temperature retraction procedure (TR) (GB/T 7758-2002, ISO 2921.
1997, IDT)
GB/T 7759 vulcanized rubber, the compression set was measured (GB/T 7759-1996 thermoplastic rubber at room temperature, high and low temperatures,
eqvISO 815.1991)
GB 12981 motor vehicle brake fluid (GB 12981-2003, ISO 4925. 1978, MOD)
QC/T 311-2008 automotive hydraulic brake master cylinder performance requirements and test methods of
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
Peeling sloughing
Carbon black is released into the rubber surface.
3.2
Scratch scoring
Formed in parallel on the rubber piston or the seal groove in the running direction.
3.3
Abrasion scuffing
Significant wear of the outer surface of the rubber.
4 General requirements
4.1 Classification
Press seal operating temperature range is divided into three categories.
Category A. -40 ℃ ~ 70 ℃;
Class B. -40 ℃ ~ 120 ℃;
Class C. -40 ℃ ~ 150 ℃.
Physical properties of rubber required 4.2
Requirements and test methods of physical properties of compound shown in Table 1.
Table 1 Physical properties of compound required
No. Item Test Method Requirements
1 Hardness, Shore A or IRHD 60 ± 5 70 ± 5 80 ± 5
GB/T 531.1, GB/T 6031,
According to GB/T 6031 arbitration
2 Tensile strength/MPa, minimum 10 10 10 GB/T 528
3 Elongation at break /%, minimum 300 200 130 GB/T 528
4 compression set of a /%, maximum 30 30 30 GB/T 7759, A type sample
Hot air aging b
Change in hardness, Shore A or IRHD
Tensile strength change rate /% maximum
The rate of change in elongation at break /% maximum
-5 to 5
-30
-30
-0 ~ 10
-40
-40
-0 ~ 10
-40
-40
GB/T 3512
Liquid resistant c
Change in hardness, Shore A or IRHD
Tensile strength change rate /% maximum
The rate of change in elongation at break /% maximum
Volume change rate /%
-10 to 0
-25
-25
0 ~ 15
-15 to 0
-40
-40
0 ~ 20
-15 to 0
-40
-40
0 ~ 20
GB/T 1690
7 low temperature performance, TR10/℃, maximum -45 -45 -45 GB/T 7758
For a Class A material test temperature (70 ± 2) ℃, test time (24 ± 1) h; the test; Class B materials, test temperature (120 ± 2) ℃
Room was (24 ± 1) h; C for material type, test temperature (150 ± 2) ℃, test time (24 ± 1) h.
b For A-based material, the test temperature (70 ± 2) ℃, test time (96 ± 1) h; the test; Class B materials, test temperature (120 ± 2) ℃
It is between h (72 ± 1); materials for Class C, the test temperature (150 ± 2) ℃, test time (72 ± 1) h.
A class of materials for c, the test temperature (70 ± 2) ℃, test time (120 ± 1) h; Class B materials, test temperature (120 ± 2) ℃; the test
It is between h (72 ± 1); materials for Class C, the test temperature (150 ± 2) ℃, test time (72 ± 1) h.
The appearance and quality of the finished size 4.3
The seal should be no air bubbles, pinholes, cracks, projections, or other foreign matter embedded testing them can be physical defects, and shall comply FIG.
Predetermined paper size requirements, not individual tolerance should meet the GB/T 3672.1 in the M3 level requirements.
Finished in claim 5
High temperature resistant liquid at 5.1
6.1 according to the provisions of the test, the seal performance should be in accordance with Table 2, and should not have bubbles or peeling.
Table 2 Liquid resistance test requirements at a high temperature
Capability allows changes
Volume change rate/0 to 20.0%
The lip diameter change rate /%
End diameter change rate /%
0 ~ 5.75
Change in hardness, Shore A or IRHD -15 ~ 0
5.2 precipitation
Test according to 6.2, the formed precipitate seal of the centrifugal separator tubes volume should not exceed 0.3%.
5.3 Test pressing stroke cylinder seals
5.3.1 General
Test according to 6.3, the wheel cylinder seals shall comply with the requirements of 5.3.2 - 5.3.6.
5.3.2 Change lip diameter
After testing by the stroke, the lip seal diameter of the wheel cylinder should be larger than the wheel cylinder chamber, which lip diameter greater than the wheel cylinder chamber should not exceed the minimum size
Table 3 provides.
Table 3 Change diameter lip seal cylinder unit is mm
Wheel cylinder chamber diameter of more than the minimum size of the wheel cylinder chamber
≤19.05 0.40
> 19.05 ~ ≤25.4 0.50
> 25.4 ~ ≤38.1 0.65
> 38.1 ~ ≤60 0.75
5.3.3 Leak
No continuous liquid leakage from the seal, should be checked at least twice, discoloration due to absorption of the liquid should not be generated on the filter paper.
5.3.4 Corrosion
Should the lumen of the piston and cylinder of corrosion, for example pitting visible, but allow a slight discoloration or dark.
5.3.5 Hardness change
Test according to 6.7, the hardness of the seal decrease should not exceed 15 Shore A or IRHD.
5.3.6 Test Status seal
The seal should not have excessive damage, such as scratches, abrasion, blistering, cracking, chipping (heel abrasion) or deformation.
5.4 Test pressing stroke of the master cylinder seal
5.4.1 General
Test according to 6.4, the master cylinder seals shall comply with the requirements of 5.4.2 - 5.4.6.
5.4.2 Change lip diameter
After the test stroke after the minimum diameter of the lip seal of the master cylinder should be larger than the master cylinder chamber, which lip diameter greater than the wheel cylinder chamber should not exceed the minimum size
Table 4 provides too.
Table 4 master cylinder seal lip diameter variation millimeters
The master cylinder cavity diameter larger than the main cylinder bore minimum size
≤19.05 0.30
> 19.05 ~ ≤25.4 0.40
> 25.4 ~ ≤38.1 0.50
> 38.1 ~ ≤60 0.65
5.4.3 Leak
And requires the same wheel cylinder seals (see 5.3.3).
5.4.4 Corrosion
And requires the same wheel cylinder seals (see 5.3.4).
5.4.5 Hardness change
And requires the same wheel cylinder seals (see 5.3.5).
5.4.6 Test state seal
And requires the same wheel cylinder seals (see 5.3.6).
5.5 low temperature performance
5.5.1 Leak
Test according to 6.5.1, there should not liquid leakage.
5.5.2 bending test
6.5.2 according to the provisions of the test, the seal should be crack, and should be close to its original shape.
5.6 hot air aging
5.6.1 General
Tested in accordance with the provisions of 6.6 shall comply with the requirements specified in 5.6.2 and 5.6.3.
5.6.2 Hardness change
Hardness change should be within ± 5 Shore A, and the IRHD.
5.6.3 Test Status seal
A sealing member should not be changed for signs of damage or shape.
Metal corrosion 5.7
5.7.1 General
Tested in accordance with the provisions of 6.8 shall comply with the requirements specified in 5.7.2 and 5.7.3.
5.7.2 Change metal strip
After the test, the mass change of the metal bar should not exceed the range specified in Table 5. Metal strip than the contact region, there should be no visible recess
Marks or the roughened surface, but allows dark or discolored.
Table 5 Corrosion Test with a metal strip allows mass change
Test metal strip allowable change in mass/(mg/cm2)
Tinplate ± 0.2
Steel ± 0.2
Aluminum ± 0.1
Iron ± 0.2
Brass ± 0.4
Copper ± 0.4
Zinc ± 0.4
5.7.3 mixed liquid changes
After the test, the brake fluid mixed with liquid water at 23 ℃ ± 5 ℃ should be no gel. Should not be formed on the glass or metal surfaces of the wall strip
Any crystalline precipitate. Mixing the liquid contained in the precipitate is not more than 0.2% by volume.
Storage 5.8 Corrosion
Test according to 6.9, after 12 cycles in a humidified incubator, the test cavity wall contacts the cylinder chamber seal should not
There are signs of corrosion or adhesion penetration. To allow a slight discoloration (dark) or corrosion on the contact surface and away from the seal test
spot.
5.9 Work durability
During the test, the sealing portion of the seal without leakage.
6 Test Procedure
6.1 liquid at a high temperature resistance test
6.1.1 Instruments and Materials
6.1.1.1 micrometer, projector, or other suitable instrument, measurement accuracy of 0.02mm.
6.1.1.2 glass vessel, capacity of about 250mL, 50mm, the diameter can be tightly sealed.
6.1.1.3 Analytical balance, weighing accuracy to 1mg.
6.1.1.4 aging tank, in line with GB/T 3512 requirements hot air aging tank.
6.1.1.5 two glass-stoppered weighing bottle, bottle size enough to fit in the seal test.
6.1.1.6 isopropanol or ethanol, 95% (volume fraction) is washed with reagent grade solvents.
6.1.2 Sample
Two seals.
6.1.3 Test Procedure
6.1.3.1 cleaning in an alcohol (6.1.1.6) in a seal, with a clean, lint-free cloth to remove dirt and debris packaging. Seal alcohol
Cleaning time should not exceed 30s.
6.1.3.2 After washing, the base diameter and the measured diameter of the seal lip member, the nearest 0.02mm, an average of two readings were taken at right angles to each other
value. Note that when measured before aging and after aging, in the same manner and in the same application site.
6.1.3.3 Measure and record the initial Shore A hardness IRHD or seal test (see 6.7 and Fig. 3).
6.1.3.4 determined by the following method the volume of each seal. Weigh the seal (m1) in air, to 0.001 g of accurate, then
Measured at room temperature after the seal is immersed in distilled water mass (m2). Each sample was immediately immersed in alcohol, and then with a lint-free
Dry filter paper of other materials.
In a glass container 6.1.3.5 (6.1.1.2), the two seals completely immersed in 75mL ± 1mL, brake fluid line with GB 12981
Then the glass container is sealed to prevent vapor loss. A vessel equipped like material placed 70 ℃ ± 2 ℃ aging tank (6.1.1.4) in
120h ± 2h; vessel equipped with a Type B material placed 120 ℃ ± 2 ℃ aging chamber for 70h ± 2h; vessel containing material into Class C
150 ℃ ± 2 ℃ aging chamber for 70h ± 2h. After aging, the aging tank removed from the container, a container with cold seal at 23 ℃ ± 5 ℃
But after 60min ~ 90min, removed from the container seal, washed with alcohol, with a clean, lint-free cloth. In an alcohol wash seal
The time should not exceed 30s.
6.1.3.6 the seal were placed in dry weighing bottle clogging oiled (6.1.1.5) was weighed (m3). Each respective seal member from
Weighing bottle removed, weighed immersed in distilled water mass (M4) to determine the displacement of the thermally soaking liquid. All are weighed
Accurate to 0.001g.
After washing the alcohol 6.1.3.7 60min, measured for each seal final volume, size and hardness.
6.1.4 represent the results
6.1.4.1 Change Volume
Should report rate of change of the volume of the initial volume ΔV, the volume change rate are given formula (1).
ΔV =
(M3-m4) - (m1-m2)
(M1-m2) × 100%
(1)
Where.
--- initial mass M1 of the air in grams (G);
--- M2 initial apparent mass in water, in grams (G);
--- M3 in the liquid immersion test in the air mass in grams (G);
--- M4 immersion liquid after the test, the initial apparent mass in water, in grams (g).
6.1.4.2 dimensional change
Diameter seal lip and the end of the dimensional change rate of the diameter of formula (2).
The lip end diameter or diameter change rate = D2-D1D1 × 100%
(2)
Where.
--- lip diameter Dl immersion test cups before or elastomeric end diameter, in millimeters (mm);
After soaking the lip diameter D2 of the test --- elastomeric cups or end diameter, in millimeters (mm).
6.1.4.3 Hardness
We should measure and report the hardness change.
6.1.4.4 Appearance
Should verify that the seal bubbles and peeling, to see whether the decomposition.
6.2 precipitation test
6.2.1 Instruments
6.2.1.1 glass vessel, capacity of about 250 mL, the diameter of 50mm, can be tightly sealed.
6.2.1.2 conical centrifuge tube, capacity 100mL.
6.2.1.3 aging tank, in line with GB/T 3512 requirements hot air aging tank.
6.2.1.4 Electric --- continuous centrifuge speed, the centrifuge tube and the center of gravity can reach 600mm ~ 700mm dynamic acceleration times; from
(3) effort to determine the rotation speed according to equation.
N≈30 nr
(3)
Where.
N --- centrifuge speed, in revolutions per minute (r/min);
--- n-fold gravitational acceleration;
--- R & lt gravity tube shaft centerline vertical distance, in millimeters (mm).
6.2.2 Sample
Test made from two or more with ...
...
