Cleaning solution with thiourea - Diaphragm cleaner

Over time, the display of pH and redox electrodes can be increasingly sluggish. In addition to the inevitable aging of the electrode itself, various deposits from the test sample, which affect diaphragm and glass electrodes, also contribute their part.

Due to the sulfides that are almost continually present in biological systems and the traces of silver chloride in the electrolytes, silver sulfides (blackening), which are almost insoluble, can form in the electrode's diaphragm. As a result, the charge exchange with the inner reference electrode becomes increasingly more difficult.

Thiourea forms exceptionally stable complexes with silver ions, so that even the silver sulfides, which are barely soluble, are dissolved after some time. First, place the electrode into the cleaning solution until the diaphragm is destained, then condition it for about 15 minutes in one of our potassium chloride solutions, finally re-calibrate it.


Contains Thiourea and Hydrochloric Acid
Please store in a cool place (4 - 10 °C).

Possible Dangers

  • Keep out of reach of children!
  • Suspected carcinogenic effect.
  • Harmful to aquatic life, may cause long-term adverse effects in the aquatic environment.
  • May cause harm to the unborn child.


Signal word: Danger

Danger warnings

H314 Causes severe skin burns and eye damage.
H351 Suspected of causing cancer.
H361 Suspected of damaging fertility or the unborn child.
H412 SchHarmful to aquatic life with long lasting effects.

Safety information

P201 Obtain special instructions before use.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P273 Avoid release to the environment.
P301+P330+P331 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
P303+P361+P353 IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water [or shower].
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.


Test tube 100 × 16 mm Ø
Simple test tube with flanged rim suitable for pH electrodes


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