The precision engineering industry produces detailed, accurate and high-quality products. With target groups such as aerospace, medical instruments and the oil and gas industry, these factors are of the utmost importance. Amari Plastics supplies an extensive package of synthetic semi-finished products that meet these requirements.
About plastics for the precision engineering industry
The precision engineering industry, also known as the manufacturing industry, manufactures parts for machine builders. Tolerances and dimensions are of great importance in this industry. This means that not all types of plastic are suitable for use in this industry. Precision mechanical processing is chosen for two reasons. On the one hand, because of the series size associated with prototypes or series from zero to the tipping point at which injection molding becomes interesting. On the other hand, because of the high demands on dimensions and the precision with which parts are manufactured.
About plastics for aerospace
The medical industry requires high-quality plastics that can be used at temperatures from -40° C to far above 100° C, while the strength and dimensional stability remain intact.
Of particular importance is the reaction of plastics to fire, with results for fire resistance, the extent to which a material produces smoke and the extent to which a material causes flaming droplets.
Commonly used standards for this are:
-UL-94: How thermoplastics behave in a fire is classified according to a UL standard (UL 94). The standard has various degrees.
The result is between HB (Slow burning of the test product, burning rate < 76 mm./min. for a wall thickness < 3 mm. This is the lightest classification.) and 5VA (Flame goes out within 60 s after the test product has been ignited 5x for 5 s. any attempt, where the product must not show a burnt hole. This is the most severe rating.)
-FAR 25.853: The different test methods according to FAR 25.853 are described in separate parts of the standard (appendix) and include, for example, specific tests regarding smoke density, released energy (heat release)
A test sample is held vertically and/or horizontally in the flame of a Bunsen burner (800C°) for 12, 60 or 120 seconds. Measurements made after removing the burner are the length of the flame, the time the sample remains lit and the formation of burning droplets.
Other common tests include producer-specific FST (flame, smoke and toxicity) requirements such as:
- Airbus standard: ABD 0031 - airbus fire testing – flame, smoke and toxicity
- Boeing Standard: BSS 7238 fire testing to smoke density
- Boeing Standard: BSS 7239 fire testing to toxicity
- ASTM Standard: ASTM E 662 fire testing to Smoke Density