Owned and run by
Hilary Redden BSc. MPhil. Ph.D.

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Fibre Testing Services for
Cashmere, Wool, Mohair, Alpaca, Llama, Guanaco and Vicuña

 

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For more information about the services offered by The Fibre Lab, please write or email us at the address below:

Hilary Redden
38 Lavender Gardens
Sacriston
Durham
DH7 6PR

Tel: +44 (0) 191 371 2273

Em: info@thefibrelab.co.uk


 

 

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What We Do

The Fibre Lab specialises in the fibre testing of individual animals, allowing owners to make informed decisions regarding their animal breeding programmes.

   
OFDA 100

We can provide:

  • Fine fibre evaluation services using the OFDA 100 (Optical Fibre Diameter Analyser)

  • Interpretation of results

  • Consultancy and breeding advice

  • Talks and presentations

 

 


Fibre Testing Price Schedule

Send your samples for testing to us at the address shown on the left.
When sending samples for testing, please specify the tests you require and calculate the cost based on the table below.
Please make cheques payable to: The Fibre Lab
Samples from each animal should be at least 1g.

PRICE SCHEDULE (from February 22nd 2010)

Test

What you get (mouseover for technical details)

Cost per sample (for 1-10 samples)

Cost per sample (for 10+ samples)

Suitable for:

Mean Fibre Diameter

Mean Fibre Diameter (µm)Add up all the diameters of the fibres measured and then divide the total by the number of fibres
Standard Deviation (µm)Not all measurements are exactly the same as the mean; calculate how much each differs (deviates) from the mean, take the square of this difference and add the squares together to get the sum. Then, take the square root of the sum and divide this by the number of measurements to give the Standard Deviation.
Coefficient of Variation (%)Divide the Standard Deviation by the Mean Fibre Diameter and multiply by 100 to get the Coefficient of Variation as a percentage. You can express the Coefficient of Variation without converting it, but it is easier to understand as a percentage.
Sample SizeThe number of individual fibres measured
Comfort FactorPercentage of fibres under 30Ám
Histogram in 2µm binsThe histogram shows the number of fibres in each 2Ám bin and how they accumulate to 100% of the fibres measured

£ 12.50

£12.00

Cashmere, wool, mohair, alpaca, llama, guanaco, vicuña

Mean Fibre Diameter & Medullation

Mean Fibre Diameter Test (as above)Mean Fibre Diameter (µm)
Standard Deviation (SD) of the mean in microns (µm)
Coefficient of Variation (CV) of the mean in percentage (%)
Sample Size (number of individual fibres measured)
Comfort Factor (percentage of fibres under 30Ám)
Histogram in 2µm bins (steps) showing the number of fibres in each 2Ám bin and how they accumulate to 100% of the fibres measured.

The number of fibres in 10,000 (10k) that are considered Objectionable (kemp fibres)The fibres have a hollow centre where the internal structure of the cells has collapsed. Light goes into the fibre and is refracted within it.
The effect, under the microscope, is to make the fibre look as if it has a black stripe inside.
This stripe can take up more than 90% of the internal space of the fibre and this is considered an Objectionable Fibre.
In your hand, the fibre will probably look coarse, uneven and dead, this is a kemp fibre and will not take up dyestuffs and may break during processing.

The number of Flat Fibres (medulla has collapsed) and the number of Medullated FibresA fibre can have small amounts of collapsed cells and empty space and have a narrow medulla or a broken or spotted medulla down the centre of the fibre.
This may not be noticeable when you hold the fibre in your hand but will have an effect when the fibre is dyed making it look uneven.
The OFDA calls these Flat Fibres or just Medullated fibres depending on how much light they reflect or absorb i.e. how opaque they are.

£14.50

£14.00

This test is suitable for white fibres only
wool, mohair, cashmere

Mean Fibre Diameter & Mean Fibre Curvature

Mean Fibre Diameter Test (as above)Mean Fibre Diameter (µm)
Standard Deviation (SD) of the mean in microns (µm)
Coefficient of Variation (CV) of the mean in percentage (%)
Sample Size (number of individual fibres measured)
Comfort Factor (percentage of fibres under 30Ám)
Histogram in 2µm bins (steps) showing the number of fibres in each 2Ám bin and how they accumulate to 100% of the fibres measured.

The Mean Curvature in degrees per Millimetre (deg/mm)As most fibres are formed they curve, this is usually called the crimp and can be even and structured in the fibre staple or 'all over the place'. The OFDA can measure how much the fibre curves per millimetre. Fibres with no curvature are straight fibres and can be difficult to spin, fibres with lots of curvature mean that even a few fibres will cling together and can be spun into fine yarns.
The Standard Deviation of the Mean CurvatureNot all measurements are exactly the same as the mean; calculate how much each differs (deviates) from the mean, take the square of this difference and add the squares together to get the sum. Then, take the square root of the sum and divide this by the number of measurements to give the Standard Deviation.

£14.50

£14.00

Cashmere, wool, mohair, alpaca, llama, guanaco, vicuña

Mean Fibre Diameter, Medullation & Mean Fibre Curvature

Mean Fibre Diameter Test (as above)Mean Fibre Diameter (µm)
Standard Deviation (SD) of the mean in microns (µm)
Coefficient of Variation (CV) of the mean in percentage (%)
Sample Size (number of individual fibres measured)
Comfort Factor (percentage of fibres under 30Ám)
Histogram in 2µm bins (steps) showing the number of fibres in each 2Ám bin and how they accumulate to 100% of the fibres measured.

Medullation Test (as above)The number of fibres in 10,000 (10k) that are considered Objectionable (kemp fibres)
The number of Flat Fibres (medulla has collapsed) and the number of Medullated Fibres

Mean Fibre Curvature Test (as above)The Mean Curvature in degrees per Millimetre (deg/mm)
The Standard Deviation of the Mean Curvature

£15.50

£15.00

This test is suitable for white fibres only
wool, mohair, cashmere

Clean Yield (single coated animals)

The Percentage of Clean Fibre left after the grease (suint), soil, sand and vegetable matter has been removedThe undercoat portion of a dehaired sample from a double coated animal e.g. goat, can also be tested for Clean Yield.
Contact us for a price quote for testing for dehaired and clean yield on the same sample.

£15.50

£15.00

Wool, mohair & alpaca

Dehaired Yield (double coated animals)

The Percentage of Undercoat Fibre in the sample after the guardhair oil, sand and vegetable matter has been removed This can be subdivided so that each portion of the contaminants is expressed as a separate percentage.
There will be an extra charge for this and you should consult us to ascertain what portions of the contaminants are important relevant to your testing requirements

£18.50

£18.50

Cashmere, llama, guanaco, vicuña

EFFN cashmere distribution

The Mean Fibre Diameter, Number of Fibres and Percentages of Fibres in specified fibre diameter groups are returned e.g. the percentage of fibres between 4-26Ám, then between 27-40Ám and finally 40plus Ám.
Allows selection for animals with increased undercoat and less intermediate fibre.

£15.50

£15.00

Cashmere, wool, mohair, alpaca, llama, guanaco, vicuña

Staple Length

The relaxed length of the fibre (mm) as taken from the animal This is closely related to maximum fibre length

£ 6.00

£ 6.00

Cashmere, wool, mohair, alpaca, llama, guanaco, vicuña

Drawn length

The fibres are sorted by hand into a fibre length diagram and the Maximum, Minimum and Median (mm) fibre lengths are recorded The fibres are pulled out onto a velvet or cashmere covered board, which holds them in place. A skilled and practiced operator can align the fibres in a thin web ranking them from the longest to the shortest.
The maximum (longest) and minimum (shortest) length can then be measured.
Half way between the maximum and the minimum lies the median. It may or may not be close to the mean.

£18.00

£18.00

Cashmere, wool, mohair, alpaca, llama, guanaco, vicuña

You can also pay via credit or debit card using PayPal if preferred; click on the icon below (but don't forget to send us the samples!).

If you'd like to pay by PayPal but aren't sure exactly how much the work will cost, or have special requirements, or would just prefer to have us invoice you via PayPal rather than paying in advance, just add a note with your samples to let us know your PayPal address, or email us with the information.

The Fibre Lab is not VAT registered.

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