RPI-5000A is specially designed to inhibit Ca/Mg Silicate scale formation in RO systems. RPI-5000A is the most effective solution to prevent the deposits of colloidal/dissolved SiO2 on the membrane surface. The maximal silicate concentration achievable in the brine stream is between 260 and 300 mg/l.


RPI-5000A is approved for use with cellulose acetate and polyamide membranes. The required dosage level ranges from 1 – 10 ppm as delivered. The dosage is proportional to the feed water flow. RPI-5000A is recommended to be used undiluted. RPI-5000A is easy to use, safe to handle and safe to store for several months. RPI-5000A is easy to handle and does not contain any aggressive component. The pH value of the product is slightly caustic.

Physical Properties

Appearance: clear, slightly yellow liquid

Density: 1.11 – 1.17 g/cm3

pH value: 4.8 – 5.3

Boiling point / boiling range: 100°C– 105°C

Freezing Point: -10°C

Solubility in water: unlimited

Storage & Handling

RPI-5000A is not classified as a hazardous chemical (GGVE/GGVS, ICOA/IATA). Standard regulations and precautions when dealing with chemical products must be followed.
RPI-5000A is easy to store. The storage temperature should be between +2 °C and 35 °C. The product is supplied in containers suitable for air or sea transportation.
The safety data sheet contains more information.


Polyethylene canister (PE) 23.5 kg net
Standard drum (PE) 240 kg net
IBC Container (PE) 1,100 kg net

Safety Data Sheet


Technical Description