97% SAL-T


Saturated 97% (0.973 aw) salt slurry reusable up to 3 years

Manufacturer: Novasina, Swiss
SKU: NV1119887


Water activity standards are used to check the performance and calibration of water activity instruments. These standards have specific known water activity values that cover the entire water activity range. There are two main types of water activity standards, saturated salt slurries, and unsaturated salt solutions. Either standard can be used to verify and calibrate water activity instruments and as would be expected both standard options have advantages and disadvantages. 

The advantage of saturated slurry standards is that they can be reused for up to three years, if maintained properly, and are easily prepared without a precision balance and complicated recipes. Their disadvantage is that they take longer to equilibrate and are temperature sensitive. 

The advantage of unsaturated salt standards is that they can be made to any water activity value, are faster to equilibrate and are less temperature sensitive. The disadvantage of unsaturated standards is that they are single-use only and must be purchased as a consumable. 

The availability of both standards ultimately allows the user to choose the standard type that best fulfills their needs. Novasina is the only water activity provider that provides both types of standards: saturated salt slurry standards called SAL-T and unsaturated salt solution standards called SAL-F. 

Saturated Salt Slurry Standards (SAL-T)

Pros Cons
Reusable with up to 3 years of shelf lifeSlow to equilibrate
Easy to UseTemperature Sensitive
Long term savingsWater activity value limited by the type of salts

Unsaturated Salt Solution Standards (SAL-F)

Pros Cons
Fast to equilibrateSingle Use Only
Less Temperature SensitivityMust be prepared to correct concentration
Allows for fast qualification and verificationMust be purchased as a consumable 
Humidity Value Part NumberNameLabStart-aw CalibrationLabSwift-aw CalibrationLabTouch-aw CalibrationLabMaster-aw NEO CalibrationVerification
6%NV1116453SAL-T 6    ✔ 
11%NV1110930SAL-T 11  ✔  ✔ 
33%NV1110932SAL-T 33
53%NV1110934SAL-T 53 
58%NV2600189SAL-T 58 
75%NV1110936SAL-T 75
84%NV1119886SAL-T 84 
90%NV1110938SAL-T 90 
97%NV1119887SAL-T 97  
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