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									Technical Information
EVP 006905 e, November 2005 supersedes TI/P 2928 e, August 1998

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= registered trademark of BASF Aktiengesellschaft, unless otherwise indicated

Lumogen Yellow S 0790
brilliant daylight fluorescent pigment for crack detectors, fluorescent markings, artist’s colors, crayons and wax crayons


chemical nature aldazine pigment Physical form Shelf life powder According to our experience, Lumogen® Yellow S 0790 can be stored for at least 10 years from the date of delivery, provided it is kept under dry conditions. Like most organic compounds, it is combustible, which must be taken into consideration for storage. density bulk density bulk volume light water acid alkali soap butter ~ ~ ~ 1.34 g/cm³ 5 l/kg 200 g/l 3 5 5 3 5 3 Colour Index part 1 Pigment Yellow 101 part 2 48 052


Fastness properties

Fastness properties were determined on prints on art paper (~ 1.5 g/m²). The changes observed were evaluated using the ISO 105-A02 (DIN EN 20105-A02) gray scale or the DIN EN ISO 105B01 blue wool scale. Assessment ratings for the fastness to chemicals according to ISO 105-A02 (DIN EN 20105-A02):

EVP 006905 e, November 2005

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Lumogen® Yellow S 0790

rating 1 2 3 4 5

fastness poor moderate fairly good good very good

discoloration strong considerable somewhat trace none

Assessment ratings for the fastness to light according to DIN EN ISO 105-B01: rating 1 2 3 4 5 6 7 8 Fluorescence spectra fastness very poor poor moderate fairly good good very good excellent outstanding

The emission and excitation spectra were measured on drawdowns on 50 µm acetate film. The cellulose nitrate combination coating used was pigmented with 1.25 % Lumogen® Yellow S 0790.

1200 1000 800 600 400 200 0 400 450 500 550 600 650 700 750 800 wavelength [nm] excitation emission

Non-destructive material testing crack detection Finished parts made of ferromagnetic metals, e. g., steel, cast iron or welding seams in these parts are often subjected to a magnetic powder test. This method is used to determine whether a finished part is free from faults and therefore suitable for its intended application because the magnetic lines of force are deviated by stray fields or cracks in the metal, which can be made visible in the light of a UV lamp.

relative emission

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Lumogen® Yellow S 0790

The fluorescent magnetic powder can also be applied to the part to be tested in the form of a suspension in a suitable solvent. Lumogen® Yellow S 0790 has established itself for the use in combination with magnetizable iron oxide. Fluorescent markings When crop protection agents are applied, it is often necessary to control the agricultural field. In such cases, the spray solution can be pigmented with Lumogen® Yellow S 0790 and the application can then be controled at night with a portable UV lamp. In order to develop the full color strength, the pigment should first be ground on the edge mill with chalk or a similar inert diluent and then added to the spray solution. Another method is to prepare a finely divided pigment paste and add that to the solution. The requisite concentration for application is approximately 0.1– 0.5 g/l. Fluorescent markings can also be applied by stamping with a coding machine. A typical formulation for a rapidly drying stamping ink is: 10–20 parts 90–80 parts Lumogen® Yellow S 0790 Resin solution, consisting of 20 % maleic resin and 80 % ethanol

This mixture is ground in suitable equipment such as ball mill, attritor, dissolver etc. Poster colors Luminous yellow poster colors can be formulated following this recipe: 15 parts 80 parts 20 parts 10 parts Lumogen® Yellow S 0790 casein solution 12.5 % polymer dispersion based on vinyl propionate, e. g., Propiofan® grades water

grind in funnel mill or with dissolver Colored crayons Colored leads with an intense yellow fluorescence in UV light can be obtained with: 12 parts 65 parts 23 parts Lumogen® Yellow S 0790 Kaolin Methylhydroxyethylcellulose, 10 %ig in Wasser

Mix intensively in kneader, then press to leads. The leads are dried and then prepared as usual with a wax mix.

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Lumogen® Yellow S 0790

Wax crayons

Yellow wax crayons that show up brightly in UV light can be prepared with: 5 37 38 20 parts parts parts parts Lumogen® Yellow S 0790 stearin paraffin wax 52/54 °C (126/130 °F) china clay

Lumogen® Yellow S 0790 and china clay are stirred into the melt consisting of stearin and paraffin wax at approximately 90 °C (190 °F). Grinding of the pigments on the edge roller is normally not necessary. The melt is then poured into molds as usual.

When handling these products, advice and information given in the safety data sheet must be complied with. Further, protective and workplace hygiene measures adequate for handling chemicals must be observed.

The data contained in this publication are based on our current knowledge and experience. In view of the many factors that may affect processing and application of our product, these data do not relieve processors from carrying out their own investigations and tests; neither do these data imply any guarantee of certain properties, nor the suitability of the product for a specific purpose. Any descriptions, drawings, photographs, data, proportions, weights, etc. given herein may change without prior information and do not constitute the agreed contractual quality of the product. It is the responsibility of the recipient of our products to ensure that any proprietary rights and existing laws and legislation are observed.

BASF Aktiengesellschaft Performance Chemicals for Coatings, Plastics and Specialties 67056 Ludwigshafen, Germany

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