Order, disposal amount and delivery
In general, our optical brighteners are in stock and can be delivered on a prompt basis.
Our optical brightener are typically supplied in 25-kg fibredrums with a PE inliner, but you can also purchase smaller quantities. We do not have a minimum purchase quantity.
Typically, our optical brightener are supplied in 25-kg fibredrums. You can also purchase 5 kilogram bags. For special applications, even 20-gram or 25-gram sachets are available in containers up to 25 kilograms. These bags have a low melting point and can be added directly into various applications.
Normally, our optical brighteners are in stock and can be delivered on a prompt basis. However, certain scheduling times (lead times) may be required to ensure optimum supply to the customers.
We believe that “The customer is king” when it comes to supply quantities and packaging. Whether it is a 25-kg fibredrum, a 5-kg bag or a 20-gram sachet, we fulfil the wishes of our customers as long as it is technically feasible. Admixed bags are as much a part of our product range as 25-kg fibredrums.
Application of optical brighteners
The colour of the final product is not so intense. Can I use optical brighteners to intensify the colour?
Yes, optical brighteners intensify the colour brilliance and the colours look more intense and brighter.
The surface of the finished part looks yellowish. Can I use optical brighteners to intensify the colour?
Yes, optical brighteners are extremely effective in removing it. They ensure that the yellowish cast effect is no longer perceived by the human eye.
Yes, optical brighteners can help you move the wave light in such a way that the yellowish cast can no longer be recognized by the human eye.
Yes, optical brighteners are also useful in synthetic leather applications or fibres.
The dosage can be optimised by a precise adjustment of optical brightener to the system to be used. In most cases, when optical brighteners are not efficient enough, they are overlapped with other additives. Which additive can be dispensed with must be decided in each individual case.
Trademark protection is becoming increasingly important today. Optical brighteners offer the manufacturer an additional possibility to make their products stand out from those of the competition, to label them individually and to protect them against imitations.
Optical brighteners can be readily used during processing even when heated to decomposition temperatures. Optical brighteners are stable at the processing temperatures of industrial plastics.
For optical brighteners, it does not matter in which applications they are used. However, dosages may differ. Depending on the polymer, colour and transparency, either higher or lower doses of optical brighteners must be used.
Optical brighteners can be added into the system in various ways. It can be added directly, in batches or as a dispersion.
Optical brighteners are compatible with most systems. However, optical brighteners are not soluble in all solvents and thus sometimes have to be introduced as a dispersion or powder.
Optical brighteners are highly compatible with the conventional light stabilisers. The dosage should be adapted for some end-use applications or light stabilisers. In most cases, the optical brightener dosage must be raised to a minimum.
Tracers are substances used for detecting the distribution in a substrate, for example, by means of UV light, and thus serve as “indicators”. Tracers are primarily used, among other things, for the surface leak tests or the detection of defects.
The colour index is a common reference for distinguishing between dye and pigment. The colour is also defined by the colour index.
In general, optical brighteners can be used with all dyes and pigments. Depending on the chemical nature of the added colour – i.e. dye or pigment – the dosage has to be adapted. In general, the amount of optical brightener can be reduced if pigments are used.
WTH Walter Thieme Handel GmbH
Telefon: +49 (0)4141 5292-0