Rosin, US NAVAL Stores

Colour Measurement | Colour Scales | Rosin, US NAVAL Stores

Lovibond® 3000 Comparator Rosin Scale, AF 670

Price: £1,698.00 (£1,995.15 Including VAT at 17.5%)

Lovibond® Rosin Scale Comparator 3000
The US Naval Stores Rosin Scale specified in ASTM D 509 is the most widely used agreed method for assessing the colour quality of Rosin. Letters are assigned to each of the 15 colour standards in the scale - XC (lightest), XB, XA, X, WW, WG, N, M, K, I, H, G, F, E, D (darkest).

The Lovibond® Rosin Scale Comparator 3000 is a 3-field instrument for visually determining the US Naval Stores Rosin colour of samples by direct comparison with coloured glass standards. It incorporates the 15 glass filters that make up the scale in a pair of discs:

Disc Range
1 - XC, XA, WW, N, K, H, F, D
2 - XB, X, WG, M, I, G, E

With a 3-section field of view, the sample and two adjacent standards on the US Naval Stores Rosin Colour scale are viewed simultaneously, making it easier to achieve the optimum colour match. For rapid colour grading within predetermined colour limits, the glass standards can be set to the two limiting colours, making it easy to see if the sample is within tolerance. The tungsten halogen light source is colour corrected to CIE standard illuminant C, which guarantees constant lighting conditions for colour grading, day or night and whatever the ambient lighting.

Principle of Operation
The sample is poured into the Rosin cell supplied and placed in the sample chamber. The sample is viewed through a prism which brings the sample and the colour standards into adjoining fields of view. The two discs containing the colour standards are rotated by turning the control knobs on the front of the comparator until the colour of the sample falls between two standards which are 1 US Naval Stores Rosin Colour unit apart, or until it exactly matches one of the standards. The reading given directly as Naval Stores Rosin Colour is then taken from the scale on the control knobs.This method is not specified in the official method, ASTM D 509, but will give equivalent results.

Technical Specification
Measuring principle : Visual comparison with coloured glass standards
Mode : Transmittance
Viewing system : Prismatic with integral blue filter for light standardisation
Light source : Tungsten halogen lamp, 12 Volt, 20 Watt
Illuminant : C
Power pack : 12 Volt ac, switchable to suit 220/110 Volt supply
Approvals : CE
Instrument housing : Fabricated mild steel
Dimensions : Width 235 mm, depth 245 mm, height 90 mm
Weight : 4.9 kg

The Lovibond Rosin Scale Comparator 3000 is supplied with a special holder for rosin samples, which is designed to recreate the measuring conditions experienced with the Rosin cubes. This is a metal-sided cell with glass ends.

Colour Measurement | Colour Scales | Rosin, US NAVAL Stores