126
Apr-09
Avantes
www.avantes.com
6.5
WS-2 White reflective tile
The WS-2 white reference tile is made out of a white diffuse plastic material, meeting the highest
demands with regard to high grade diffuse reflectance, mostly used in colorimetry applications
where a reference signal has to be obtained during a reflection measurement. Thanks to most
accurate preparation of the PTFE and its processing to an amorphous structure, the tile reflects light
from 350-1800 nm with ca 98% and from 250-2500nm more than 92%. The material offers along term
stability, even in deep UV applications, the plastic is hydrophobic and chemically inert.
The material can be delivered as custom designed items, such as the WS-2-GEM with a 10 mm radius
hole for nitrogen cooling of gemstones for gemology applications, contact us for more information.
General Care
WS-2 is an optical standard and should be handled in much the same way as other optical standards.
Although the material is very durable, care should be taken to prevent contaminants such as finger
oils from contacting the material‟s surface, because this causes a loss of reflectivity especially in
the UV region. Always wear clean gloves when handling WS-2!
Cleaning Instructions
If the material is lightly soiled, it may be air brushed with a jet of clean dry air or nitrogen. DO NOT
use Freon. For heavier soil, the material can be cleaned by using an ultrasonic bath with double
distilled or deionized water for 2 hours at 40 to 60°C. After this dry the WS-2 piece at 60° C for a
12-hour period (If possible at a vacuum of 1 Torr or less, then purge the vacuum oven with clean dry
air or nitrogen). Caution!! Never use soap-water, alcohol, and organic or any other cleaners for WS-
2. This will cause a big loss of reflectivity in the UV reflectance.
Technical Specifications
Reflectivity
(see curve)
>98% (350-1800nm)
>92% (250-2500nm)
Max. temperature
280 °C
Dimensions tile
32mm diameter / 10mm thick
Housing
38 mm diameter, black anodized
