Rubber Aging and Ozone Test Chamber

Development of the Rubber Industry

Industrial technology is increasingly developed. In recent years, the rubber industry has achieved a lot of development. The existing sub-sectors are rising steadily, while the new rubber sub-sectors are developing rapidly. In life, plastic toys, rubber gloves, tapes and other products have added a lot of joy and convenience to our lives; rubber not only provides people with daily and medical light industrial rubber products that are indispensable. Construction, machinery, electronics and other heavy and emerging industries provide a variety of rubber production equipment or rubber parts, such as: in the industrial field, rubber in bridge construction shock absorption, automotive parts sealing, electronic product conductors, etc.

However, here is a question: if there is a problem with the quality and performance of so many rubber products in our life, how much loss will it bring to people?

All kinds of corrosive gases caused by the increasingly developed industry are mixed in the air, such as ozone. Its destructiveness is a very severe test for materials or products. It can cause rubber products to crack, degrade, pulverize, and harden.

The Function and Prospect of Ozone Test Chamber

As the name suggests, the ozone test chamber is a test equipment for evaluating the weather resistance of products by simulating or accelerating the aging of rubber by ozone in the atmosphere.

Nowadays, the concept of environmental testing is becoming more and more vigorous. In order to meet the growing needs of today's society, people's enthusiasm for research and development of new materials is on the rise. At the same time, in order to test the various weather resistance properties of new materials and the adaptability to special environments, more and more test equipment is put on scientific stage, including the well-known UV aging test chamber, salt spray test chamber, high and low temperature test chamber, ozone test chamber and so on. Today we will talk separately about the market value and application prospect of ozone test in terms of gas corrosion.

With the development of industry, the application of ozone weathering test will increase accordingly. Nowadays, the ozone test chamber can be used for rubber products such as vulcanized rubber, thermoplastic rubber, cable insulation sheath and other products. Under static tensile deformation, they are exposed to airtight and dark air containing constant ozone concentration and constant temperature test chambers. Test the sample according to the scheduled time, from the cracks on the surface of the sample or the change degree of other properties, use the ozone test chamber to scientifically and reasonably realize the aging crack test of non-metallic materials and rubber products, so as to evaluate the quality of rubber.

Therefore, the market value of the ozone test chamber increases with the development of the industry, and its application prospects will be very broad, and it will make more contributions to mankind.

Learn Something About LIB Ozone Test Chamber

structure design

A transparent window is set at a reasonable position of the test chamber door to observe the changes of the indoor specimen. The observation window adopts multi-layer hollow tempered glass, and the inner glued sheet conductive film has the advantages of transparency, heat insulation, and is not easy to produce steam frost.

The equipment adopts a long-shaft fan motor for stirring, and a stainless steel multi-wing impeller resistant to high and low temperatures to achieve a vertical diffusion cycle of strong convection, so that the temperature in the laboratory is uniform and has been stable.

High-quality fixable movable wheels are installed at the bottom of the machine, which can easily move the machine to the specified position and finally fix the castors

Requirements for sample holders

1. It is composed of shell, electronic components and ozone generator.

2. Under the required elongation, the two ends of the specimen are fixed with a fixture, and when in contact with the ozonated air, the length direction of the specimen should be basically parallel to the direction of the airflow.

3. The fixture should be made of materials (such as aluminum) that are not easily decomposed by ozone.

4. Make the specimen rotation speed between (20-25) mm/s, in the plane of a vertical dry airflow, each specimen continuously moves along the same path.

5. The time for the same specimen to rotate for one week is (8-12) min. The scanning area of the specimen (the shaded part indicated in Figure 2) is at least 40% of the effective area of the test chamber.

6. Use at least 3 samples for each test condition.

7. The width of the long standard specimen is not less than 10mm, and the thickness is 2.0MM is 0.2mm, and the length of the specimen between the ends of the fixture before stretching is not less than 40mm.

Workroom

The internal material is 304 stainless steel, mirror surface, rust-proof to high and low temperature and moisture corrosion resistance.

Nice ruggedness and long life.

Viewing Window

Double layer insulating glass 8cm thick, made of tempered glass.

The conductive film is located on the interior glass to prevent window frosting, built-in LED light for the work room lighting ;can clearly observe samples.

The light control button is located below the controller.

Controller

PID programmable color touch screen controller, network connection computer.

Can edit 100 programs 20 segment.

LIB also can preset program into the controller based on user testing requirements.

The set system language is English for standard.

Electromagnetic Lock

Door lock is an electromagnetic lock, which will generate a strong suction force and tightly attract the iron plate to lock the door

Unlocking is operated on the controller for safety and prevent malfunction.

Insulation

10cm thick polyurethane foam and insulation cotton;

Better insulation performance, degradation resistance, environmental protection, noise reduction.

External Materials

A3 steel plate with galvanized coating;

Electrostatic treatment; High and low temperature corrosion resistance; High hardness, anti - impact

Very high safety factor;

Color can be customized.

Ozone Exhaust Device

The ozone exhaust device is equipped with an activated carbon to absorb ozone to make workplace clean and safe.

Exhaust the gas after the test, automatic controlled on controller

Heating and Cooling Systems

After the liquid refrigerant absorbs the heat of the cooled object in the evaporator, it is vaporized into low-temperature and low-pressure steam, sucked by the compressor, compressed into high-pressure high-temperature steam, discharged into the condenser, and radiated to the cooling medium in the condenser, condensed into a high-pressure liquid, throttling through a throttle valve into a low-pressure low-temperature refrigerant, and again entering the evaporator to absorb heat and vaporize, to achieve the purpose of cycle refrigeration.

In this way, the refrigerant completes a refrigeration cycle through four basic processes of evaporation, compression, condensation, and throttling in the system.

When the current humidity is less than the set point humidity, the equipment is automatically humidified. The humidification of is automatically heated by the humidification tank. When the water is heated, steam is generated, and then the steam is injected into the working room to increase the test humidity.

The centrifugal fan is installed at the rear of the chamber body, and the air is uniformly distributed through the air outlet. Air circulation adopts air outlet at top and air return at bottom, and the wind speed and pressure are in compliance with the test standard, and the temperature is stabilized at the moment of switching. The high-quality centrifugal fan is used to strongly supply air circulation, making the temperature distribution in the test area uniform.

Far-infrared nickel alloy high-speed heating heating wire is adopted;

Ozone, temperature, humidity, refrigeration completely independent system;

The temperature control output power is calculated by the microcomputer to achieve high precision and high efficiency of electricity consumption;

Compressor: French TECUMSEH compressor;

Refrigeration mode: air cooling;

Refrigerant: R404A, R23;

The heating and cooling systems are completely independent;

Standard: ISO1431;ASTM 1149；IEC 60903 ;IEC60811-403;JIS K6259;ASTM D1171

Filters driers, refrigerant flow windows, repair valves, oil separators, solenoid valves, and liquid storage cylinders are all imported original parts.

The Main Technical Parameters

Test Method

According to the test methods and standards, it can be divided into "static" and "dynamic". Static means that the sample is stretched and then placed in the test chamber for testing. Dynamic means that the sample is placed on the fixture of the test chamber and stretched while doing the test. In the test, the tensile fluctuation is about 5%-35% of the tested sample itself.

Specimens of vulcanized rubber are exposed to the deteriorating influence of air at specified elevated temperatures for known periods of time, after which their physical properties are determined. These are compared with the properties determined on the original specimens and the changes noted.

Unless otherwise specified, the determination of the physical properties shall be carried out in accordance with

Test Methods D 412.

Except as may be otherwise specified in this test method, the requirements of Practices D 3182 and D 3183 shall be complied with and are made part of this test method.

In case of conflict between the provisions of this test method and those of detailed specifications or test methods for a particular material, the latter shall take precedence.

Rubber and rubber products must resist the deterioration of physical properties with time caused by oxidative and thermal aging. This test method provides a way to assess these performance characteristics of rubber, under certain accelerated conditions as specified.

At least three test specimens shall be used to determine the original physical properties of each sample and also three or more specimens of the same material for each exposure period of the test.

When minimum requirements are specified, one test shall be made for tensile strength and elongation. If the results are below the specified requirements, two additional specimens shall be prepared from the original sample and tested. Should the results of either of these tests be below the specified requirements, the samples shall be considered to have failed to meet the specifications.

The stress-strain properties or tensile strength and ultimate elongation and any other required properties of the original unaged specimens shall be determined within 96 h of the start of the aging period. Results on specimens that are found to be imperfect shall be discarded and retests shall be made.

When rubber compounds are to be tested for the purpose of determining compliance with specifications, it shall be permissible to determine the original properties required in 9.1 simultaneously with the determination of the values after the first aging period even though the elapsed time exceeds 96 h.

Place the specimens for aging in the chamber after it has been preheated to the operating temperature. If possible, avoid simultaneous aging of a mixed group of different compounds. For instance, high-sulfur compounds should not be aged with low-sulfur compounds and those containing antioxidants shall not be aged with those having no antioxidants. Some migration is known to occur.

The operating temperature may be any elevated standard temperature as shown in Practice D 1349, as agreed upon. NOTE 1—Caution: It should be noted that, for each 10°C increase in temperature, the rate of oxidation may be approximately double. With rapid aging types of rubber or those containing or contaminated by certain oxidizing chemicals, the rate of oxidation may be catalyzed to such an extent as to become violent with increasing temperatures.

Start the aging interval at the time the specimens are placed in the chamber and continue for a measured time interval. The selection of suitable intervals of aging will depend on the rate of deterioration of the particular material being tested. Intervals frequently used are 3, 7, and 14 days.

Use aging intervals such that the deterioration will not be so great as to prevent determination of the final physical properties. In experimental work, it is desirable to use a range of periods, while for routine tests of known materials, fewer intervals may be employed.

D 573 – 04

At the termination of the aging interval, remove the specimens from the chamber, cool to room temperature on a flat surface, and allow them to rest not less than 16 h nor more than 96 h before determination of the physical properties.

Contact LIB for Your Own Ozone Test Chamber

All models of ozone test chamber are upgrade to programmable controller and Ethernet access that provides simple operation and control. Ozone chambers are available in a variety of sizes to suit your needs.

Advantages:

Use silent discharge type ozone generator, gas automatic generated.It has low noise and high purity features.

The ozone exhaust device is equipped with an activated carbon to absorb ozone to make workplace clean and safe.Exhaust the gas after the test, automatic controlled on controller.

Multiple languages can be selected, English, Chinese, Russian, Korean, German, French, Polish, Spanish, Turkish, Romanian.