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New WIRA Precision Fibre Microtome

Relevant Test Standards

ISO 137, BS 2043, ASTM D2130
IWTO-8-97, IWSTM 24, DIN 53811

The new WIRA Precision Fibre Microtome has been developed to be easy to use and produce accurate cross-sectional specimens of fibre for further examination under a microscope.

The new instrument is based on the existing principle of the microtome, to cut a defined thickness of fibre from a minimum of 10 microns for microscopic identification and measurement.

Method of Testing

A degreased bundle of fibre is inserted into the slot on the top of the Microtome. The embedding medium is applied to the bundle and allowed to dry. The fibre bundle is placed on the ejector and the micrometer wheel is used to determine the required thickness of fibre sample and this section is cut off with a razor blade.

Cross-sectioning reveals certain characteristics that may be used to identify fibres. The following features should be observed:

	Contour of the fibre
	Thickness of the cuticle layer
	Presence of medulla – if present, its type, shade, contour in relation to that of the fibre, and position in the fibre
	Presence of pigment – if present, its distribution whether it is sparse, dense or in large aggregates, and whether it is most dense near the medulla or near the cuticle or arranged in bi-lateral form.

Cross-sections can also be useful when examining fibres for dye penetration.

Approximate Dimensions:

	120mm (h) x 85mm (diameter)
	Weight 1.2kg