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TECHNICAL PROPERTIES

Technical Properties
Material Density kd/dm3 Tensile Strength MPa Elongation % E-modulus (Tensile) MPa Source
SMC 1,9 74 1,6 9.000 SMC-Alliance
PP/EPDM 1,0 15 300 1.400 Basell
PC/PBT 1,2 55 150 2.100 GE
PUR-RIM 1,4 28 2,8 1.300 Saechtling
Steel 7,85 410 28 210.000 Dubbel
Aluminum 2,7 180 5 70.000 Dubbel

Relative Weight
Material   Process SpecificWeight WallThickness Part Weight Relative
    g/cm3 mm kg Weight index
Steel stamping 7,8 0,8 3,7 100
Aluminum stamping 2,7 1,1 1,8 50
SMC moulding 1,9 2,5 2,8 75
Source: Philip Townsend Associates          

SMC,BMC Properties
Property Unit SMC SMC BMC
Random % 25 50 20
Continuous % 0 0 0
Tensile strength MPa 65-80 124-204 35-45
Tensile modulus GPa 8,5 12,2-19,1 11
Flexural strength MPa 155-200 240-380 100-120
Flexural modulus GPa 8,5 11,6-16,4 11-13
Impact strength KJ/m2 60-90 120-200 50-70
Density g/cm3 1,7-2,0 1,8-2,0 1,8-1,9
CTE 10-6m/mK 14-20 10-15 14-20
Shrinkage % 0-0,15 0-0,1 0-0,1
HDT º C >200 >200 >200
Service temperature º C 170-190 170-190 170-190

Electrical Properties
Property Standard Unit Value
Volume resistivity IEC 60093 Ohm x cm 1013-1014
Surface resistance IEC 60093 Ohm 1013-1014
Dielectric strength IEC 60243-1 kV/mm 15-25
Comparable tracking index IEC 60112 CTI 600
Dielectric dissipation factor IEC 60250 - 0,01-0,02

Thermal Behavior

Performance at low Temperatures (-40 º C)

  
 
  • Strenght not affected
  • Stiffness not affected
  • Impact properties not affected
  • Crash behaviour not affected
  • Appearance: not affected by low temperature
  • Performance at elevated Temperatures
  • SMC/BCM/CIC parts will retain their properties over a broad range of temperatures.
  • No melting
  • No heat sagging 
  

Heat Resistance
Heat resistance (ISO75-2A) >200 º C
Temperature index (EC216) 150 º C
Specific heat 2,1-4,2 kJ/kgK
Coefficient of thermal conductivity 0,17-0,40 W/mK
Coefficient of thermal expansion 10-18x10-6 m/mK

Chemical Properties
Organic Media Resistant Organic Media Resistant
 hot bitumen +  hydrochloric acid (10%) +
 petrol +  phosphoric acid (10%) +
 diesel oil +  phosphoric acid (85%) +
 jet fuel (kerosene) +  sulphuric acid (10%) +
 epoxy resin +  sulphuric acid (37.5%) +
 alcohol +  battery acid +
 crude oil +  nitric acid (10% +
 fatty acid +  caustic soda (diluted) -
 glycerine +  caustic potash solution (diluted) -
 heating oil +  seawater +
 turpentine oil +  potassium chloride (diluted) +
 carbon tetrachloride -  sodium chloride (diluted) +
Composites have proven their excellent weather ability in long-term service in a broad variety of climates.

Weathering Behavior
A material’s weather ability describes its resistance to outdoor exposure even under severe weather conditions.
Composites have proven their excellent weather ability in long-term service in a broad variety of climates.
 

Weathering Factors
* UV radiation
* Water absorption
* Hot-cold cycle
* Abrasions by wind and dust
* Germs, animals and plants

Mechanical Properties After 21 Years
    New PartAfter 21 Years  
Flexural Strength MPa 189 175
Flexural Modulus GPa 11,7 10,5
Flexural Strain % 2,1 2,1
Tensile Strength MPa 102 89
Rupture Strain GPa 12,9 12,1
Impact Strength % 72 62
Surface Resistance Ctm 10+2 10+2
Dielectric Strength KV/cm 13 12

Fire & Smoke Properties
Property                    Benefits
Low smoke density Chance to find exits and escape
No toxicity For the safety of passengers
No melting, no dripping No spread of the fire
High fire retardancy Does not lose structural integrity
Halogen-free No generation of corrosive gases
Low heat generation Chance to save the passengers
No flash-over through gases No spread of fire to surrounding areas

Dimensional Stability
  • * No shrinkage
  • * High strength, stiffness , impact
  • * Thermal Stability -40 ile 200 º C
  • * Low linear thermal expansion (same as steel)
  • * Creep resistance