Plastic resistance to external agents
After cycles combining temperature and humidity, either for compliance with standards or personalized to each client, different product and/or material properties are evaluated, such as deformations, changes in appearance and loss of mechanical properties to determine how these change after ageing and whether these changes affect the product’s life cycle.
This consists of solar simulation tests in which the aim is to simulate accelerated exposure to solar radiation. There are a wide range of applicable standards, such as UNE-EN ISO, and ASTM as well as in-house automobile manufacturer standards. The properties that can be measured after this type of ageing are diverse and will depend on the use and application of the tested product.
One of the typical characteristics of all plastics is their low fire resistance. The demand for self-extinguishing materials is increasing due to the need to offer higher safety levels. There are two types of flammability tests according to UL 94: horizontal and vertical, which consist of measuring the burning time of a plastic sample fixed horizontally or vertically, after it has touched the flame of a burner during the time specified in the corresponding standard.
A specific flammability test is carried out for the automotive sector under international regulations and specifically adapted by the main vehicle manufacturers: Ford, Volvo, Opel, Nissan, VW, etc. This Horizontal Flammability test evaluates the fire resistance of materials inside a car and affects all non-metallic materials that are used in the manufacture of parts located in car interiors. The maximum speed of flame propagation in these materials is standardised and established by most vehicle manufacturers at a maximum of 100 mm/min.
This analysis is used to verify the feasibility of contact between the packaging material and the packaged product, especially in chemical product packaging. Exposure conditions are defined considering factors such as temperature, shelf life, container shape, thickness distribution, filling volume, head space and composition of the packaging material and the packaged product.
These tests are closely linked to thermoset plastics, reinforced with fibreglass, etc., though they are also used to test the capabilities of some thermoplastics. In these tests, the sample is subjected to the action of a liquid (fuel) in its liquid and vapour phases and, after the treatment, the mechanical properties (tensile and flexural) of the original sample are compared with the one tested, as well as the variation in mass and appearance of the samples. The evaluation will depend on the corresponding standard or on the agreement between the parties as to how much the mechanical properties should diminish or the absence of changes in the appearance of the material. The typical liquids used are solvents, gas oils, and liquids used in the automotive sector (oils, cleaning liquids, etc.).
The test products are exposed to different chemical agents and substances commonly used in different sectors (construction, automotive, furniture) under varying weather and environmental conditions, to verify the surface effect they have when they come into contact with plastic products.
AIMPLAS has the know-how and the appropriate equipment to be able to offer solutions for all needs when evaluating the performance of plastic materials exposed to external agents..
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Physical mechanical Laboratory