Sodium hydroxide monohydrate

TraceSELECT™, for trace analysis, ≥99.9995% (metals basis)
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TraceSELECT™ Ultra and TraceSELECT

  • ultra-pure acids, bases, and salts for smelting and wet digestion in environmental, water, and food analysis
  • sample preparation for trace analysis requires reagents of the highest purity; our TraceSELECT Ultra products for ultra-trace analysis at ppb and even ppt levels are produced by sub-boiling distillation
  • the acids, bases, and salts in the TraceSELECT series have been developed for sample preparation and analysis in the ppb (μg/kg) trace range
  • packaged in high-quality containers appropriate for each product
  • the reagents are produced and bottled under clean-room conditions



CAS Numbers (All) EC Number Linear Formula
NaOH · H2O
MDL Number
Molar Mass
58.01 g/mol
RTECS Number



aluminium (Al)Max. 0.05 ppm
arsenic (As)Max. 0.01 ppm
barium (Ba)Max. 0.5 ppm
calcium (Ca)Max. 0.5 ppm
cadmium (Cd)Max. 0.01 ppm
cerium (Ce)Max. 0.01 ppm
cobalt (Co)Max. 0.01 ppm
chromium (Cr)Max. 0.01 ppm
copper (Cu)Max. 0.01 ppm
europium (Eu)Max. 0.01 ppm
iron (Fe)Max. 0.05 ppm
mercury (Hg)Max. 1 ppb
iridium (Ir)Max. 0.5 ppm
potassium (K)Max. 2 ppm
lanthanum (La)Max. 0.01 ppm
lithium (Li)Max. 0.2 ppm
magnesium (Mg)Max. 0.1 ppm
manganese (Mn)Max. 0.01 ppm
nickel (Ni)Max. 0.01 ppm
lead (Pb)Max. 0.01 ppm
palladium (Pd)Max. 0.5 ppm
platinum (Pt)Max. 0.5 ppm
rhodium (Rh)Max. 0.5 ppm
ruthenium (Ru)Max. 0.5 ppm
antimony (Sb)Max. 0.05 ppm
scandium (Sc)Max. 0.01 ppm
selenium (Se)Max. 0.01 ppm
samarium (Sm)Max. 0.01 ppm
strontium (Sr)Max. 0.5 ppm
thallium (Tl)Max. 0.01 ppm
vanadium (V)Max. 0.1 ppm
yttrium (Y)Max. 0.01 ppm
ytterbium (Yb)Max. 0.01 ppm
zinc (Zn)Max. 0.05 ppm
silicate (as SiO2)Max. 5 ppm
bromide (Br)Max. 0.5 ppm
chloride (Cl)Max. 1 ppm
fluoride (F)Max. 0.5 ppm
nitrite (NO2)Max. 0.5 ppm
nitrate (NO3)Max. 1 ppm
phosphate (PO4)Max. 0.05 ppm
sulfate (SO4)Max. 2.5 ppm
total NMax. 5 ppm


Boiling Point/Range1.390 °C (1.013 hPa. Anhydrous substance)
CorrosivityCorrosive to metals
DensityNo data available
FlashpointNot applicable
GradeTrace Analysis
Incompatible MaterialsAluminium, Tin, Gives off hydrogen by reaction with metals, Zinc, Exothermic reaction with water, Exothermic reaction with strong acids
Lower Explosion LimitNot applicable
Melting Point/Range319 °C (Anhydrous substance)
Partition CoefficientNo data available
Purity Percentage100.00
Purity Details>=99.999%
Solubility in WaterCompletely soluble
Upper Explosion LimitNot applicable
Vapor PressureNo data available
ViscosityNo data available
pH-Value14 at 50 g/l
Product LineTraceSELECT™
Storage TemperatureAmbient

Safety Information

Hazard Class8
Package GroupII
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