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Lily Hu

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Shenzhen XINZHENHUI Sealing Technology Co.,Ltd


Address: No.5 Industry Avenue, Sanyanhu Village, Pingshan New District, Shenzhen, China

Tel: +86-755-2882 5958

      +86-755-2882 5658

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What Are The Testing Standards For Rubber Tubes?

Rubber tube characteristics are physiological inert, resistant to ultraviolet light, ozone resistance, high and low temperature (-80 to 300 degrees), high transparency, strong resilience, compression is not permanent deformation, oil, resistance to stamping, Naisuan Jian, Flame retardant, withstand voltage, conductive and other properties.

Rubber tube inspection project

Physical and mechanical properties: density, hardness, surface resistivity, dielectric properties, tensile properties, impact properties, tearing properties, compression properties, adhesive strength, wear resistance, low temperature performance, rebound performance, bending test

Reliable test: ozone resistance, oil resistance, wear test, smoke test, liquid resistance test, hot air accelerated aging test

Resistance to liquid properties: Lubricants, gasoline, oil, acid, alkali, organic solvents

Size: inner diameter, length tolerance, size measurement

Applicable performance: resistance to hydraulic, pulse test, conductive properties, watertight, air tightness

Rubber tube inspection standard

1, hose size measurement:

Inner diameter, outer diameter, reinforced outer diameter, wall thickness, concentricity, inner and outer layer thickness, assembly inner diameter, new GB and ISO increase the length and measurement point mark, Measuring method of hose length.

2, hydraulic test

Verify the pressure test: Verify that the hose and assembly are exposed to stress for 30s-60s for leaks, deformation and damage.

Pressure deformation test: the specified pressure (working pressure to verify the pressure or other pressure below the pressure) for 1 minute to measure the length and diameter of the hose changes and twist angle and bending.

Blasting pressure test: Determine the pressure at which the hose is blasting at the specified boosting speed.

Leak test: at minimum 70% of the burst pressure under static pressure to save 5min, repeated once, check whether the leak or damage. As the test is often water, and the actual use of liquid viscosity is different, measured at room temperature burst pressure and leakage pressure may be slightly lower.

3, low temperature bending test

Low temperature rigidity: The ratio of the measured torque to the measured torque at 180 ° after twisting at 12 ° C for 12 hours on a torsion wheel with a diameter of 12 times the diameter of the hose.

Low temperature bending: the hose clamped in the diameter of the hose diameter of 12 times the twist on the wheel, after 24 hours at low temperature, twisted in 10s 180 °, check whether the internal and external rubber embrittlement and damage. rubber tube Measuring the low-temperature brittleness of the hose The simplest test is to bend the specimen at 90 ° at a low temperature, or to compress a piece of hose after cooling to see if it is brittle. There is also a method of free falling with a weight of heavy hammer. See if the sample is brittle.

4, bending test:

After the hose is bent to a certain extent, the ratio of the minimum outside diameter of the bent portion to the outer diameter before bending, the ball passing capacity, and the bending force when pressurized in the tube are measured.

5, suction flat test:

In 1min after the vacuum, keep 10min, with a diameter of 0.9 times the diameter of the steel ball rolling, check the degree of collapse of the hose. Some standards used to measure the rate of change in the outer diameter of the hose to indicate the degree of deformation of the hose.

6, interlayer adhesive strength test:

Automotive hose for the diameter of less than 50mm braided hose, the test commonly used wide 10mm or 25mm long strip of samples, but also with a wide 25mm ring, was 90 ° peel, the tensile speed of 25mm / min.

7, liquid wall through test:

Under normal pressure, the hose and the container filled with a certain liquid are connected and sealed to the container nozzle, rubber tube the test device is placed horizontally, and then the mass change of the entire test device due to the outward penetration of the liquid through the hose is periodically weighed to obtain the liquid The penetration rate.

8, volumetric expansion test:

The hose shall not have a significant volume change under the pressure of the transfer liquid. The method of measuring the volume expansion is to connect the hose to a hydraulic source and the other end to a volume of the liquid volume after the expansion of the hose. The pressure in the hose to the test pressure to expand the hose, rubber tube and then close the hydraulic source, open the tube connected with the tube, then the volume of the expansion of the liquid part of the rise to the tube, you can measure the expansion of the volume.

9, cleanliness and extraction test:

On the fuel hose commonly used C liquid into the hose, empty 24h after emptying, and use C liquid cleaning the inner wall. Collecting the injected and rinsed C liquid, filtering the insoluble impurities, drying and weighing the weight of the insoluble impurities, indicating the cleanliness of the number of impurities in the inner surface area of the unit hose or the maximum size of the impurities;

The filtered solution was evaporated, dried, and the weight of the soluble substance was weighed. The wax was extracted from the filtrate and evaporated to dryness. rubber tube The resulting methanol extract was evaporated to dryness and the weight of the wax was weighed.

10, salt spray test:

The hose assembly was placed in a salt spray of 5% sodium chloride aqueous solution at 35 ° C for 24 hours to check whether the pipe joint was corroded.