PET

POLYETHYLENE TEREPHTALATE (PET)

PET is a polymer which is obtained as a result of polycondensation of methyl terephthalate with ethylene glycol. This technical plastic is characterised by high mechanical endurance, ductility, which makes it widely applicable.

PROPERTIES:

  • hardness and rigidity
  • very high chemical resistance
  • very high creep resistance (higher than in polyamides)
  • very high impact strength (stable in a wide range of temperatures)
  • good dimensional stability
  • low water absorption (0.02 %)
  • good resistance to atmospheric factors and corrosion
  • very good dielectric properties
  • resistant to chemical factors such as alcohols, oils, fats, grease, petrol etc.
  • lack of harmful micro molecular substances (even in trace amounts)  admitted to direct contact with food
  • high mechanical and thermal endurance
  • wide service temperature limit: from -40 to +110°C for basic type
  • very good sliding properties
  • good cutting and polishing qualities

COLOURS: white, black, light grey
SPECIAL TYPES:

PET TX is a class of polythene thereftalate, which has been enriched by the addition of a lubricant. The obtained type of PET had good sliding properties and very low abrasion rate.
PET GF-30 has been enriched by fibreglass, thanks to which PET GF-30 characterises itself by higher temperature service, better rigidity, superb electro insulating properties and even lower water absorption than clean PET.

APPLICATION:

PET is advised to be used where dimensional changes caused by moisture absorption and high temperature are unacceptable. Most important branches of industry in which PET is used are: (electro)machine and automotive (elements of fuels systems e.g. fuel pump, filters, brake system; air conditioning elements), electrical and electronic engineering (bearings, levers, sprockets (competes with PA and POM), covers with specified mechanical and electrical functions such as office devices, computers, monitors, printers, domestic appliances, lamp covers, photographic accessories as well as sockets, plugs and condenser covers (creep current resistance), household equipment. PET is also used for production of sports equipment such as ski bindings and sailing equipment (good endurance in changeable conditions), etc.

TECHNICAL INFORMATION

PROPERTIES UNIT PET
GENERAL PROPERTIES
Density g/cm3 1,39
Water absorption, saturation % 0,52
Hygroscopic rate 230C % 0,26
MECHANICAL PROPERTIES
Tensile modulus N/mm2 3410
Hardness H 961/30 N/mm2 170
Tensile strength at yield N/mm2 86
Elongation at break % >15
Impact strength kJ/m2 >50
Notched impact (Charpy) kJ/m2 3,5
Time unit tensile (1% 1000h) N/mm2 26
THERMAL PROPERTIES
upper permanent service temperature limit 0C 110
upper temporary service temperature limit 0C 150
LINEAR EXPANSION COEFFICIENT 23-1000C 10ExpE5x1/K 6
Thermal conductivity (230C) W/Km 0,28
Thermal dimensional stability A (ISO-R 75) 0C 80
Thermal dimensional stability B (ISO-R 75) 0C 60
Melting point 0C 255
Fire class according to UL-Standard 94 HB
ELECTRICAL PROPERTIES
Dielectric strength kV/mm 25
Surface resistivity Ohm 10Exp 16
Volume resistivity 0Hm cm 10Exp17
Dielectric constant 10E x p6 Hz 3,2
Dielectric dissipation factor 10E x p6 Hz 0,014
RODS PET
DENSITY (g/cm3) 1,37
Diameter mm Weight kg/m
5 0,03
10 0,115
16 0,3
20 0,45
25 0,7
30 1,05
40 1,79
50 2,8
60 4
70 5,45
80 7,1
90 9,05
100 11,1
110 13,5
120 16,1
125 17,4
150 25,1
200 44,52
SHEETS PET
Density(g/cm3) 1,37
Diameter mm Weight kg/m
4×1000 5,58
10×500 7,44
16×500 11,92
20×500 14,75
25×500 18,27
30×500 22,25
40×500 29,3
50×500 36,35
60×500 43,75
80×500 58,4
100×300 44,4