Engineering Thermoplastic
Polyamid 6.6, 6 and Blends
AKROMID® A, B, C
The right polyamide for every application
Along with polyamide 6.6, polyamide 6 is the most commonly used grade of engineering thermoplastics due to its versatility. AKROMID® A, B and C are based on partially crystalline polyamide which offer excellent strength and stiffness, high heat destortion temperature and good resistance to chemicals. The compounds combine high heat resistance up to 230°C depending on the stabilisation and good electrical properties. We modify our products according to your customer requirements with glass fibres, carbon fibres, flame-retardant additives or impact modifiers.
Trade name | Polymer | Melting point |
|---|---|---|
AKROMID® A | PA 6.6 | 262 °C |
AKROMID® B | PA 6 | 220 °C |
AKROMID® C | PA 6.6/6 blends | 260 °C |
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Product Characterisation
AKRO-PLASTIC is specialized in the production of highly reinforced polyamide. In partnership with its sister company, the extruder manufacturer FEDDEM GmbH & Co. KG, AKRO-PLASTIC has developed a technology that consistently provides the same high quality of the products, irrespective of the production site. Furthermore our products exhibit higher strength than those of our market competitors due to a gentle compounding of the fibre reinforced compounds.
The Diagramm shows the glass fibre distribution of an AKROMID® A28 GF 50 9 black (5030) over 25 batches. The average of these 25 batches is 49.87%. The product specification is currently + 1,5%, whereby only a range of +0.5% is required in reality. In comparison, market competitors indicate +2% or +2.5% for their inspection certificate tolerances.
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AKROMID® A, B, C
Processing
AKROMID® A, B and C can be processed on commercially available injection moulding machines with standard screws according to the recommendations of the machine manufacturer. Please refer to the information on the TDS.
Most plastic pellets, and polyamide 6 and 6.6 in particular, absorb moisture from the air during storage. An excessive moisture content in the plastic pellet can lead to problems during injection moulding. Visible streaks or bubbles can appear on the component surface, for example. As further secondary effect, due to the presence of water, insufficiently dried pellets can break down hydrolytically during the plastification process.
One might therefore conclude that long drying times are favourable in every instance for the processing of polyamides. Yet this is not the case. During injection moulding, component defects can be caused not only by too much moisture; too little moisture in the pellet can also result in undesirable side effects. Thus for optimal processing, polyamides require a residual moisture content of at least 0.02 %, and up to 0.1 %, for example; quite often, however, the pellet is overly dried, resulting in decreased flowability of the melt. Problems with the filler performance are a possible consequence. Moreover, undesirable surface markings can also occur.
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Example of undesirable surface markings
Drying of AKROMID® pellets made of foil-laminated PE sacks is not necessary, provided the pellet is removed from an undamaged container. It must be ensured that the container has reached ambient temperature prior to opening in order to prevent the formation of condensate. Dried pellets should be processed as quickly as possible and whilst still hot. If the containers are open, the required drying time can increase significantly due to moisture absorbed from the air.
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PA 6.6 alternatives
Due to bottelnecks in supply chain and the current price development AKRO-PLASTIC is proud to provide alternative solutions for substitution of PA 6.6 applications for every customer.
One of the new development witch regards to a PA 6.6 substitution is called AKROMID® B+. Reinforced with 50 % glass fibres, this compound achieves the same strength at 80 °C as a conditioned PA 6.6 GF50 (115 MPa breaking stress). Read more here.
Disclaimer: All specifications and information given on this website are based on our current knowledge and experience. A legally binding promise of certain characteristics or suitability for a concrete individual case cannot be derived from this information. The information supplied here is not intended to release processors and users from the responsibility of carrying out their own tests and inspections in each concrete individual case. AKRO®, AKROMID®, AKROLEN®, AKROLOY®, AKROTEK®, ICX®, PRECITE® and DIA(hr)LOG® are registered trademarks of AKRO-PLASTIC GmbH.