FD |
Fibre Diameter | The mean (average) micron result of a sample. |

SD | Standard Deviation | Measures in microns the spread of fibres either side of the mean FD in which 68% (two-thirds) of the fibres lie. The lower the SD the more uniform the wool. |

CV | Coefficient of Variation | The CV is the SD divided by the mean FDx100. CV measures the FD variability as a percentage. CV tends to fall in the range of 15% to 30%, with 15% being very uniform wool, whilst 30% is highly variable wool. |

%>30.5 |
Fibres greater than 30.5um | Measures the percentage of fibres above 30.5 microns. Results greater than 5% may cause the pricklel effect. |

CF |
Comfort Factor | Measures the percentage of fibres below 30.5 microns. Calculated as 100 minus the percentage of fibres below 30.5 microns. |

SF |
Spinning Fineness | Calculated using the mean FD and CV to determine an "effective" fineness. This figure gives a measure of spinning performance. For wools of any particular micron the spinning performance decreases as the CV increases. |

CURV |
Curvature | Measures how rapidly a fibre bends along an average standard short length of the fibre. Expressed as degrees of curve per millimetre of fibre (deg/mm). Curvature measurements usually range between 70 and 150 deg/mm. Curvature strongly relates to crimp frequency, therefore the higher the curvature the higher the crimp frequency. |

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