WFS-81 blue fluorescent dye for leak detection in aqueous systems, solvent-free


Plus 19% MwSt.
Delivery Time: Ab Lager lieferbar
SKU container size PriceQuantity
LS-WFS81-GB-8-25 Small container 8x25ml
LS-WFS81-GB-8-30 Small container 8x30ml
LS-WFS81-GB-24-30 Small container 24x30ml
LS-WFS81-GB-6-50 Small container 6x50ml
LS-WFS81-GB-18-50 Small container 18x50ml
LS-WFS81-GB-05 0.5 liter dosing bottle
LS-WFS81-GB-5 5 liter canister

WFS-81 from SECU-CHEK is a water-soluble dye for leak detection in water- and glycol-based fluid systems. It works in both static and circulating systems, such as boilers, hot water heaters, pumps, cooling systems, etc.

WFS-81 is only visible under UV-A radiation and glows blue. In addition, the dye does not change the color of the host fluid. Liquid systems that contain SECU-CHEK products for leak detection do not need to be replaced. The dye does not change the characteristics of the liquids.

  • replaces Spectroline WD-801
  • similar characteristics like WATER-GLO ULTRA BLUE (SPI-WGB or WATER-GLO 801)
Larger purchase quantities are available (20l, 60l, 200l barrels and 1,000l IBC tanks) as well as call-off orders and special bottlings (e.g. for simple, fast and safe dosing in series production): Make an individual request now: Contact


Simply add WFS-81 to the system in the appropriate quantity and allow it to circulate for at least 5 min. Reduce ambient brightness as much as possible and examine all areas using a UV light or blue light system
After repairing and cleaning the leaks with degreaser or the usual cleaner, simply run and check the system again.

Recommended dosage:
5ml WFS-83 to 20 liters of water
30 ml WFS-83 to 120 l water
120 ml WFS-83 to 480 l water
240 ml to 960 l of water
500 ml to 2000 l of water

Store dark and cool (below 40°C).

Application examples:
There is a leak in the engine, the slide valve is leaking or a hydraulic valve is leaking fluid. These and other areas of application such as refrigeration unit maintenance or fuel leakage detection can be easily and effectively implemented with the SECU-CHEK fluorescent dyes and ensure lower costs and greater safety as well as prevent long maintenance downtimes. WFS-81 is the cheaper universal solution as an alternative to this product for water circuits: WATER-GLO ULTRA BLUE fluorescent dye (SPI-WGB / WATER-GLO 801) – leak detection / leak detection of aqueous systems

Technical Data

Additional information

Weight N/A
Dimensions N/A
container size

0.5 liter dosing bottle, 20 liters, 200 liters, 5 liter canister, Small container 18x50ml, Small container 24x30ml, Small container 6x50ml, Small container 8x25ml, Small container 8x30ml



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