HEPES Free Acid is a buffering agent used in lab media and buffers.
 
HEPES (free acid)
Appearance: White, crystalline powder.
Purity: ≥99.5%.
Lead: ≤5ppm.
Iron: ≤5ppm.
Moisture: ≤0.5%.
pH at 25°C (1M): 5.0–6.5.
A260 at 0.1M: ≤0.05.
A280 at 0.1M: ≤0.04.
 
HEPES Free Acid provides superior buffering capacity and stability and is recommended for use in cell culture media. It is available in a variety of concentrations and is ideal for biological and biochemical applications.