Sil-Select Stock

Sperm preparation media – stock solution

Sil-Select Stock is our home made stock solution for preparing density gradient system for semen preparation. Sil-Select Stock is an isotonic solution of silane-coated silica particles in a chemically defined, balanced salts solution with HEPES (pH buffer). Sil-Select Stock can be used in combination with IUI, IVF and ICSI. The density of Sil-Select Stock is approximately 1.12g/mL.

Extensive testing during the design of the product has shown it to be non-cytotoxic and non-irritant with a non-significant allergenic potential.

Sil-Select Stock is manufactured from raw colloidal silica, so we have full control over each step in the production process. We have developed a very accurate purification system which results in a very clean product with endotoxin levels below 0.5EU/mL.

Information about the composition of the product can be found in the material safety data sheet.


Europe: CE-marked – USA: US FDA cleared
Canada: Health Canada License – Brazil: registered

Product order codes
SIS100 : Sil-Select Stock – 100mL
SIS500 : Sil-Select Stock – 500mL
SIS100G : Sil-Select Stock with gentamicin – 100mL

pH 7.2 – 7.9 (7.2-7.6 at product release)
Osmolality 300-330mOsm/kg
Sterility Sterile
Endotoxine < 0.5 EU/mL
Sperm Survival test ≥ 80% motility recovery after 4 hours exposure ≥ 75% motility recovery after 24 hours exposure
Density 1.1150-1.1250g/mL
Viscosity in cP (25°C) <1.75cP
Shelf life 18 months from date of produce

Sperm Processing

Sil-Select Stock is a stock solution for the preparation of density gradients for sperm selection

Instructions For Use
Material Safety Data Sheet