Preface
Ozone Resistance Test Chamber is mainly used to evaluate the ozone aging resistance of non-metallic materials and rubber products.
This chamber is a kind of equipment specially used to simulate and accelerate the aging process of materials in ozone environment. It provides a closed lightless environment, which contains air with constant ozone concentration and constant temperature conditions, so that the specimens (such as vulcanized rubber, thermoplastic rubber, cable insulation sheath and other products) are exposed to this environment under static tensile deformation. In this way, the ozone aging resistance of materials such as rubber can be evaluated. By controlling parameters such as ozone concentration, temperature uniformity, and air flow velocity, the aging of materials under different conditions can be simulated, so as to predict the durability of the material in actual use.
Basic concept of ozone
Ozone, a gas with a light blue color and a special smell at normal temperature and pressure, is known for its excellent oxidizing ability and bactericidal effect.
As a strong oxidant, ozone is generally corrosive to metals. Except for gold and platinum, which have less impact, almost all metals will suffer from corrosion in an ozone environment. In particular, aluminum, zinc and lead will oxidize rapidly when they come into contact with ozone.
However, iron alloys with a high chromium content have a high resistance to corrosion from ozone.
Ozone is also highly corrosive to non-metallic materials. When designing ozone generating equipment, ordinary rubber is not suitable for use as a sealing material because it is easily corroded. Instead, silicone rubber or acid-resistant rubber with stronger corrosion resistance should be selected.
Ozone aging test equipment
Ozone Resistance Test Chamber: equipment used to simulate specific environmental conditions.
Ozone generator: produces ozone of a specific concentration.
Ozone measuring device: used to monitor and control ozone concentration.
As a professional manufacturer of environmental testing equipment, BOTO GROUP has rich experience and excellent technical strength in the manufacture of aging test equipment. The production base is equipped with advanced production equipment and strict quality control processes, and can provide customers with high-standard and high-quality environmental testing equipment.
Test Principle
In this test, the sample is placed in an environment that maintains a constant temperature and ozone concentration. At set time intervals, the sample is checked for cracks or crack propagation. The test can be carried out using the following three inspection methods:
After exposure to the specified time and strain conditions, the sample is checked for cracks and the extent of the cracks is measured if necessary.
Under any specified strain conditions, the shortest time for the sample to start cracking is determined.
For any specified exposure time, the maximum critical strain at which the sample does not crack is determined.
Test method
Although ozone is a gas with extremely low content in the atmosphere, it is the main factor causing cracks in rubber materials. The tolerance of different rubber materials to ozone varies significantly depending on ozone concentration and ambient temperature. By simulating and enhancing ozone conditions in the atmosphere in a test chamber, the samples are exposed to an environment containing a constant ozone concentration and regularly inspected for cracks.
Test Standards
There are many different and necessary test standards for Ozone Resistance Test Chamber, which can be referenced as follows:
GB 7762-03: Chinese national standard for ozone cracking resistance test of vulcanized or thermoplastic rubber.
GIN 53509-1: International standard for ozone resistance test of rubber materials.
ISO 1431/1: International Organization for Standardization standard, which specifies the test method for ozone cracking resistance of vulcanized or thermoplastic rubber.
| Item | Test conditions |
| Ozone concentration pphm | 25, 50, 100, 200, 500, 1000 |
| Test temperature °C | 40+2 (other temperatures can be selected, but not more than 60) |
| Elongation | 20% (other elongations can also be used) |
| Specimen installation | After stretching, the specimen is placed in an ozone-free darkroom at standard temperature for 24~48h |
| Specimen state adjustment | 15min after the specimen is installed, place it in an ozone environment |
Other test standards
VW 2.8.1: Volkswagen standard covering requirements and tests for rubber materials.
| Item | Test conditions |
| Ozone concentration ppm | 2 |
| Test temperature °C | 25±3 |
| Sample installation | In the use state or similar installation state, a certain load is specified for certain parts, for example: for special-shaped materials, they are stored around a radius of 30mm; for special-shaped materials with a thickness of ≤5mm, they are stretched by 20%~25% with a fixture or tested around a circular column with a radius of 5 times the thickness of the sample. |
| Sample state adjustment | After the test piece is installed for 15 minutes, it is placed in an ozone environment. |
QC/T 17-1992: China's automotive industry standard, which specifies the weather resistance test method for automotive parts.
| Item | Test conditions |
| Ozone concentration pphm | 50±5 |
| Test temperature | 40±2 |
| Sample installation | Vertical suspension without contact |
| Number of ozone concentration measurements | Measure every 15 minutes after placing the sample, and once a day after 3 hours |
| Sample state adjustment | Test after 24 hours in a closed box |
| Number of samples | The surface area of the sample is not more than 60% of the horizontal cross-sectional area of the test equipment chamber. |
Result determination
The test results should clearly report whether the sample has cracked. If cracking occurs, the extent of the cracking needs to be evaluated, which can be demonstrated by describing the characteristics of the crack or taking photos. In addition, the maximum strain at which the sample does not crack and the minimum strain at which cracking occurs after the specified exposure time need to be determined to define the critical strain range.
After reading this article, I believe you will have a deeper understanding of the ozone aging test and a general idea of the Ozone Resistance Test Chamber. If you are interested in learning more, please do not hesitate to contact us now! Click here!
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