PEKK — Polyetherketoneketone

Polyetherketoneketone (PEKK) is a semi-crystalline thermoplastic in the polyaryletherketone (PAEK) family of polymers. It possesses high heat, chemical, and mechanical load resistance. PEKK has a glass transition temperature (Tg) of 162 °C. The properties of PEKK polymer are very similar to those of PEEK. Differences can be found, for example, in the melting and glass transition temperature, due to the different amount of ether and ketone groups. This results is e.g. an improved stress cracking behaviour and slightly better chemical resistance than PEEK.

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Structure

Application

Aerospace: high performance composite

Transport: high performance composite

Oil and gas: Seals / Guiding Ring for Drilling and Production Blocks

Chemical industry: Coatings of chemical equipment

Various: gear wheels, bushings and bearings, seals, 3D printing.

Selected Grades

Items		Units	Test Methord	5901-UN00	7901-UN00	7902-UN00	7902-CA30	7902-GL30
General Properties	Density	g/cm³	ISO 1183	1.29	1.29	1.52	1.42	1.52
	Water absorption by saturation (23°C)	%	ISO 62	0.2	0.2	0.2	0.2	0.2
	Melt volume flow rate 380 °C/5Kg	g/10min	ISO1133	15-35	30-50	15-35	6	15
	Flammability @1.5mm		UL 94	V-0	V-0	V-0	V-0	V-0
Mechanical properties	Tensile strength	Mpa	ISO527	90	120	110	245	175
	Tensile modulus	Gpa	ISO527	3.1	4.1	4	24.9	12.8
	Elongation at break	%	ISO527	110	15	15	>1.5	2.1
	Flexual strength	Mpa	ISO178	140	185	170	353	260
	Flexual modulus	Gpa	ISO178	3	4.2	4.1	22.5	11
Thermal properties	Glass Transition (Tg)	°C	ISO 11357	155-160	160-165	155-160	155-165	158-165
Thermal properties	Melting Temperature ™	°C	ISO 11357	295-315	345-350	343-348	343-348	343-348