Translation of "Temperaturwechseltest" in English

In comparison measurements the adhesive strengths were determined also after a temperature change test.

Especially in the alternating temperature test to DIN EN 198, systems containing solvents have a tendency to cause stress cracking in the finished reinforcing layer.

In a thermal shock test going from +125 to -45 degrees Celsius, both materials withstand more than 1,000 test cycles.

The coating had an adhesion value according to DIN 53 151 of 0 and easily passed both the condensed water test (DIN 50017-KK) and the alternating temperature test (ASTM D1211).

Table 2 further shows the respective number of crowns examined in the thermal-shock test and the number of defective crowns in this connection.

These filters have an advantageous crack structure with comparatively large flakes, which does not change even after having been submitted to a thermal shock test between 900° C. and ambient temperature for 3000 hours, which proved that they have an adequate stability, e.g., for use as high-temperature heat reflection filters.

The LED housings from comparative example 2, which were not reinforced with glass fibres, exhibit satisfactory long-term reflectivity but are very brittle, are difficult to process and have inadequate mechanical stability, which leads to cracking in the thermal cycling test.

Here, the long-term reflectivity is comparable to Example 1, but the LED housings produced with this moulding material suffer crack formation in the thermal cycling test after only a few cycles.

The flexible circuits thus prepared are easily solderable with conventional soldering systems and survive the temperature cycling test customary in the industry.

If more than one per cent of the LED housings suffer crack formation during this thermal cycling test, the test has been failed.

The composite adhesion was determined after ageing the samples for 3 or 6 days in a temperature variation test (TVT) (1st cycle: 15 hours at 105° C. followed by 30 minutes at 30° C. followed by 8 hours at ?40° C. followed by 30 minutes at 23° C.).

As apparent from Table 1, Inventive Examples 1-4 exhibit not only a distinct improvement in adhesion to the polyurethane system after a temperature variation test but also constantly high or improved toughness, high heat distortion resistance, high elongation at break values with a high modulus of elasticity and well-balanced shrinkage characteristics.

Particularly preferred moulding compositions are those for which overall shrinkage does not exceed 1.28% and at the same time the composition adhesion after a temperature variation test for 6 days is >7 N/mm.

It was an object of the present invention to provide improved polycarbonate compositions having good adhesion to polyurethane systems after a temperature variation test, composite systems comprising these polycarbonate compositions and polyurethane layers, and shaped bodies formed from these composite systems.

The polycarbonate compositions are notable not only for good adhesion to the polyurethane system after a temperature variation test but also for high low-temperature toughness, high heat distortion resistance, high modulus of elasticity, and also high elongation at break and low overall shrinkage.

Air-cooled transformers subjected to a temperature change test according to Cenelec standard HD 464 (which begins at ?25° C. for class “C2”) have a good chance of withstanding the test when the potting system used has a crack index below ?25 (the value critical for this invention).

Solvent-containing systems, such as those which can be used in applying a backing to moulded acrylic sheeting, tend to give stress cracks in the finished reinforcement layer, in particular in the DIN EN 249 temperature cycle test.

Solvent-containing systems, as sometimes used when applying a backing to mouldings made from acrylic sheeting have a particular tendency towards stress cracking in the finished reinforcement layer in the DIN EN 198 temperature cycle test.

All the equipment passed the voltage withstand underwater bath tests, operation experience with temperatures ranging from –60 °C up to +60 °C test, temperature cycling test, corrosion resistance test etc. Insulation materials are made of weather and UV resistant polymer.

To investigate how much the new silicone encapsulants contribute to thermal shock resistance, LED chips were encapsulated with the new silicone products, and the packages that were produced in this way were investigated in industry-standard temperature cycling tests.

The Sunmodule Plus also achieved excellent ratings in the sub categories of thermal cycling test and damp heat test ? a clear indication of outstanding module durability.

The effect of hafnium doping is particularly striking in filters having a large number of layers: at 2 mole. % Hf there are still too many cracks, while at 5 mole. % a filter is obtained which is only a little dispersive, and which is stable when subjected to a thermal shock test between 900° C. and ambient temperature.