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Do you have a question about toxic black mold, household mold, do-it-yourself mold inspection and remediation,
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Assignment
Verification of humidity activation levels for Humidity Indicators type A, B and C Test Objects
Humidity Indicators AB of type A, B and C. The humidity levels of activation of the indicators have been measured to about 75% RH, 85% RH and 58% RH respectively. The test was performed on ten indicators of each type from the following branches:

 
  Identification No Batch No
A 75% RH 10 00 00 10 75030502
B 85% RH 10 00 00 17 85030502
C 58% RH 10 00 00 03 58030502


The test objects arrived to SP the 6th of October, 2003.

Test Procedure
The indicators were exposed in a Fisons climate chamber. The temperature and relative humidity was measured with a Vaisala HMI 38 with HMP 36E humidity probe. The equipment was calibrated at SP (calibration certificate F319577-4).

According to Vaisala the accuracy of the measured humidity values are +1% RH (nonlinearity and hysterisis). According to the calibration certificate, the uncertainty of measurement of the calibration is +0.83% RH, +1.08% RH and +1.22% RH at 58 % RH, 75% RH and 85% RH respectively.

The temperature in all the exposures was 23°±0.3°C. The samples were first exposed in a humidity level about 3% RH under the provided activation level for 24 hours. Thereafter the humidity was raised to about 1% RH under the activation level for 24 hours. After these steps the indicators were examined for signs of activation. Finally the samples were exposed for another 24 hours at about 1% RH over the activation level and then checked for a clear activation. Each time the humidity was raised the samples were kept in 50% RH and 23C until the humidity level was settled in the climate chamber. The measured and used humidity levels are presented in the table below.

 
  A – 75% RH * B – 85% RH * C – 58% RH *
3% RH below 72.2 +1.5% RH 81.6 +1.6% RH 55.5 +1.3% RH
1% RH below 74.5 +1.5% RH 83.5 +1.6% RH 57.2 +1.3% RH
1% RH over 76.5 +1.6% RH 85.5 +1.6% RH 59.1 +1.4% RH


As the measured humidity in the chamber oscillates and the indicators only accumulate humidity over the activation level, only the highest measured humidity values were used for calculations. Those values are presented in this report.

The uncertainty of the activation level of the humidity indicators has been increased because of the approximation. An uncertainty of 0.5% RH, 1.0% RH and 1.0% RH has been added at 58% RH, 75% RH and 85% RH respectively. This is based on the amplitude of the oscillation.

The exposures were carried out from October 13th, 2003 to November 11th, 2003.
Test results
All tested humidity sensors were activated in the correct humidity interval. The established activation levels are presented as these intervals in the table below. The uncertainties include the oscillation in the climate chamber. The results are valid at 23°C.

 
Product type Interval of activation *
A (74% RH) 74.5 +1.8% RH – 76.5 +1.9% RH
B (85% RH) 83.5 +1.9% RH – 85.5 +1.9% RH
C (58% RH) 57.2 +1.4% RH – 59.1 +1.5% RH


*The reported uncertainty of measurement is an expanded uncertainty (U), based on a standard uncertainty multiplied by a coverage factor, k=2, which provides a level of confidence of approximately 95%.

SP Swedish National Testing and Research Institute
Surface Protection and Corrosion

Magnus Palm Stefan Almström
Technical Manager Technical Officer

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                                                 Last update: Feb. 3, 2007


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Do you have a question about toxic black mold, household mold,
do-it-yourself mold inspection and remediation, mold prevention, mold health, mold training, or any other mold problem?
 Please email international mold expert Phillip Fry moldconsultant@yahoo.com

Read the 25 steps recommended by Mr. Fry for safe and effective
mold remediation and mold removal.

 Bleach Mold Myth: "While bleach is often recommended for remediation of surface mold on wood, our [university research study] results illustrate that the treatment does not eliminate the surface microflora," is the conclusion of the Oregon State University study of the effects of chlorine bleach on mold growth on Douglas fir wood [an important timber crop in the state of Oregon]. The research study was conducted by Professor Jeffrey Morrell, Dept. of Wood Science, Oregon State University, as assisted by Adam Taylor [graduate research assistant] and Camille Freitag [Senior Research Associate], as published in Forest Products Journal, 54:4, 2004.   Mold Terms and Mold Terminology
 

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