Durostone® UPM 203 / HM 2471

Durostone® UPM 203 is a fiber-reinforced plastic for mechanical and electrical applications. This plastic material has a defined flammability (UL listed) and offers good performance against electric arc and tracking. The fiber reinforcement is carried out with a glass mat (GRP).



Standard sizes

  • 2020x1020mm
  • 2440x1220mm
  • 2470x1250mm


  • 0,8 - 3mm
  • 4 - 80mm
  • 3 - 40mm

Type acc. to standard (EN 60893)

UP GM 203

Thermal endurance (IEC 216)



Technical ValuesTest methodUnitUPM 203
Fibre reinforcement--mat
Specific gravity-g/cm31,82
Standard colour--white/red
Previous quality--UPM71/s
DIN 7735 type--UPGM 203
EN 60893/IEC 893 type--HM 2471
Nema-LI.1 designation--GPO-3
NFC 26153/26151 StandardISO 1183 meth 1g/cm3VmP2e
Bending strength (perpendicular)ISO 178MPa130
Modulus of elasticity (perpendicular)ISO 178MPa9000
Compressive Strength (perpendicular)ISO 604MPa250
Impact strength (parallel)ISO 179kJ/m240
Tensile strength (parallel)ISO 527MPa70
Electric strength at 90°C (perpendicular)IEC 60243kV/mm12
Breakdown voltage at 90°C (parallel)IEC 60243kV/25mm75
Comparative tracking indexIEC 60112CTI600
Tracking and erosion resistanceIEC 60587 meth 1-IB 2,5
Thermal conductivityISO 8302W/mK0,3
Thermal enduranceIEC 60216T.I.155
Insulating classIEC 60085-F
FlammabilityIEC 60707-FVO/>3mm
Coefficient of linear expansion (parallel)-10-6K-115-30

Remarks: Property variation possible in the area of 50mm, average - not guaranteed technical values. Tol. accord with EN 60893-3-5. The data mentioned are average values. We cannot accept any responsability for their accuracy.

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Rainer Sanders
General Manager Sales & Marketing