AKROTEK® PK

The Polyketone with universal qualifications

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Polyketone High-Performance Thermoplastic Polymer

Good chemical resistance

Aliphatic Polyketone (PK) is a high-performance thermoplastic polymer with a melting point of 220°C. This is the result of polar ketone groups in the polymer backbone creating a strong attraction between polymer chains. Polyketone (PK) meets the demands of a wide range of applications and has been enjoying somewhat of a renaissance thanks to its environmental credentials relative to other polymers. This is due to comonomer CO (carbon monoxide) in the structure of the polyketone. An industrial “waste” gas which can contribute to global warming, it bonds with a polymer to form a highly favourable monomer. 

Polyketone has several properties which no other polymer has in this combination. Freshly injection-moulded polyketone has the greatest yield strain (over 20 %) compared to all other semi-crystalline polymers, virtually independently of moisture. This tremendous elasticity gives many components made of PK a high degree of safety in the design phase.

The outstanding characteristics of PK:

• excellent resilience
• reduced moisture absorption
• good tribological properties
• good resistance to chemicals
• good hydrolysis resistance
• shorter cycle times

Product Characterisation

AKROTEK® PK

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Injection molding process

Process optimized compounds

Polyketone tends to thermo-oxidative degradation and / or crosslinking reactions under excessive thermal stress. This can be recognized by an increase in viscosity and / or the appearance of dark spots in natural colored compounds. During the injection molding process, a residence time of 10 minutes should not be exceeded.

AKRO-PLASTIC succeeded in developing a product series, which is characterized by a larger process window during processing. As you can see from the graph, the injection pressure of the currently available AKROTEK® PK-VM GF 30 black (4896) increases continuously with the increase of the dwell time in the injection molding unit and has reached a pressure maximum at a dwell time of 10 min. The optimized variant with improved stabilization, AKROTEK® PK-VM GF 30 black (8655), exhibits an almost constant injection pressure over a wide dwell time range.

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High technical and flame-retardant products with improved CO2 footprint

Flame-retardant polyketone

Special requirements in e-mobility regarding flame retardancy, mechanics, chemical resistance, electrical properties, colour stability, processability and sustainability pose major challenges for a compound. AKROTEK® PK-VM GF 30 FR orange (8537) is the product of choice for e-mobility applications, e.g. battery management, MEB connectors, cable ducts and more. 

The AKROTEK® PK-VM GF 30 FR meets the highest flammability requirements and is UL listed in all colours V0 from @ 0.8mm including RTI listing. AKRO uses only the most advanced flame-retardant systems that are free of red phosphorus and halogens. The requirements of high voltage components, such as bus bars, require a CTI of 600 V, which AKROTEK®PK-VM GF 30 FR orange (8537) meets.

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The required colour stability and laser marking of the e-mobility industry can be realised by this material. 

The process optimised AKROTEK® PK product portfolio offers injection moulders a wider processing window and more flexibility in processing.

Diagramme_1500px_Verweilzeiten PK-VM GF 30 FR_en

AKROTEK® PK-VM GF 30 FR was developed for injection moulding and can also be processed on a large scale in 3D printing using pellet extrusion in additive manufacturing. See the video below.

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Compounds

Compound Explorer


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Resistance to Media

Hydrolysis resistance

Plastic components that come into contact with water/glycol mixtures require special compounds. Here, good chemical resistance and low water absorption are the be-all and end-all. The PA 6.6 GF 30 HR established on the market is reaching its limits here, especially in the area of thermal management for the e-mobility sector.

Polyketone compounds inherently exhibit very low moisture absorption, which means that the components show very good dimensional stability in humid environments. The excellent hydrolysis resistance to water / glycol is one of the major strengths of AKROTEK® PK.

When ageing according to the VW standard (TL 52682 over 1000h/135°C), only a very small decrease of the material strength is visible compared to PA 6.6 GF 30 HSRL (see figure). This provides a significant advantage in the design of the component geometry. Thin component wall thicknesses with constant pressure ratios in the component can thus be realized without any problems.

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Resistance to Media

Chemical Resistance

The outstanding chemical resistance of polyketones (PK) is based on their semi-crystalline structure. About half of the chemical constituents come from carbon monoxide, and a comparable structure is challenging to find in conventional chemicals and solvents. As a result, polyketones demonstrate excellent resistance to chemical influences.

The table illustrates that PK exhibits remarkable resistance to dissolution, degradation, and swelling when in contact with various chemicals. Neither fuels nor halogenated or aromatic hydrocarbons significantly affect the mechanical properties. Materials with hydrogen bonding, such as water, methanol, and ethanol, only lead to minor swelling.

It is noteworthy that solvents with a similar chemical composition, especially ketones and esters, cause only minimal swelling. In contrast to polyamides like PA6 and PA66, polyketone shows pronounced resistance to aqueous media, including weak acids and bases. However, PK is less resistant to strong acids and bases, especially under elevated temperatures and prolonged exposure.

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Chemical resistance data are subjective classifications based on resistance tests following standards, ISO 175, ISO 11403-3, ISO 4599, ISO 4600, ISO 6252, etc. The information is only intended as a basis for an initial assessment.
Resistance to Media

Battery Acid (38 % H₂SO₄)

The chemical resistance of AKROTEK® PK is one of the materials’ biggest strengths. It resists corrosion due to weak acids, which typically corrode longchain polyamides such as PA 12 and PA 6.6. Only light surface discolorations can be observed after 30-day conditioning in 10 % hydrochloric acid, 30 % sulphuric acid or battery acid. The elongation at break remains virtually at the starting level, however.

PK-VM GF 30 (4706): After 24 hours in Battery Acid
AKROTEK® PK

PK-VM GF 30 (4706): After 24 hours

PK-VM GF 30 (4706): After 48 hours in Battery Acid
AKROTEK® PK

PK-VM GF 30 (4706): After 48 hours

PA 6.6 GF 30: After 24 hours in Battery Acid
Comparison product

PA 6.6 GF 30: After 24 hours

PA 6.6 GF 30: After 48 hours in  Battery Acid
Comparison product

PA 6.6 GF 30: After 48 hours

PK-VM GF 30 (4706): After 24 hours in Battery Acid
PK-VM GF 30 (4706): After 48 hours in Battery Acid
left: PK-VM GF 30 (4706): After 24 hours, right: PK-VM GF 30 (4706): After 24 hours
PA 6.6 GF 30: After 24 hours in Battery Acid
PA 6.6 GF 30: After 48 hours in  Battery Acid
left: PA 6.6 GF 30: After 24 hours, right: PA 6.6 GF 30: After 48 hours
AKROTEK® PK

Applications

AKROTEK® PK is an absolutely versatile material. The most important markets for AKROTEK® PK are the automotive, furniture and food industry and mechanical engineering. Have a look at the polyketone with universal qualifications and its applications.

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EXCELLENT CHEMICAL RESISTANCE

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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. AKROMID®, AKROLEN®, AKROLOY®, AKROTEK®, ICX®, PRECITE® and DIA(hr)LOG® are registered trademarks of AKRO-PLASTIC GmbH.

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