DG Colorimetric Indicators

Chemteq DG Colorimetric Indicators for gases and vapors. Indicators are available for wide range of toxic chemicals including hydrazines, chlorine dioxide.

Chemteq DG Colorimetric Indicators are available for wide variety of  gases and vapors in air. They are suitable for OSHA TWA and STEL measurements. Even coat for reproducibility and accuracy.

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  • Real time and direct read
  • Detection limit at or below OSHA PEL
  • Accurate and reproducible (overall accuracy, better than ±25% at the 95% confidence level)
  • Selective to target chemical
  • long service life and shelf life

If you require an application not listed, please contact us at info@chemteq.net or call us at 877-CHEMTEQ

Useful Links
OSHA Permissible Exposure Limits
NIOSH Pocket Guide to Chemical Hazards

Chemteq DG Colorimetric Indicators

DG Colorimetric Indicators - Overall Specifications

aThicknessOne side indicator: 0.15” to 0.17”

Two sides indicator: 0.3” to0.4”
bDimensions:Custom cut to your desired size
cTemperature range:-20oC to 55oC (-4oF to 131oF)
dHumidity range:5% RH to 85%RH
eMinimum detectable limit:See table below
fStorage temperature:4oC to 25oC, (39oF to 77oF)

DG Colorimetric Indicators - Available Indicators

Item No.Chemical NamePart No.Minimum Detectable
Service Life
Shelf Life (Years)Cross Interferences
1Acetone (Methyl ketones Indicator)53359 months1a
2Acids5110.0714 months1b
3Ammonia5171023None Known
4Allyl bromide551514 months1h
5Aniline5130.248 hours14 monthsc
6Aromatic diisocyanates5150.004114 monthsNone Known
7Arsine5160.028 hours1d
8Basic vapors5120.0514 months1e
9Chlorine (Halogens Indicator)5190.29 months1Other halogens
10(HS) Chlorine dioxide5200.314 months1Strong Oxidants
11(LS) Chlorine dioxide5441011Strong Oxidants
12Dimethyl hydrazine ( 1,1) (UDMH)5220.00424 hours1f
13Ethyl chloroformates5230.0272 hours1g
14Fluorine (Halogens Indicator)5190.29 months1Other halogens
15Formaldehyde5250.314 months1h
18(LS) Hydrazine Waterproof5450.1522None Known
19Two sides (LS) Hydrazine Waterproof5260.1522None Known
20(HCl) Hydrogen chloride5270.514 months1None Known
21(HF) Hydrogen fluoride5280.511None Known
22Hydrogen sulfide5290.0522None Known
23Waterproof Hydrogen sulfide5460.522None Known
24Two sides, Waterproof Hydrogen sulfide5480.522None Known
25Iodine (Halogens Indicator)5190.29 months1None Known
27Mercaptans553111None Known
28Methyl-chloroformate5320.272 hours1k
29Methyl ethyl ketone53359 months1a
30Monomethyl hydrazine5340.00448 hours1l
31Nitrogen dioxide HS5350.00511m
32Organic Vapors536n11n
33Ozone5370.0058 hours1o
34Phosgene5380.01572 hours1p
35Phosphine5390.028 hours1q
36Sulfur dioxide HS5410.28 hours1None Known
37UV Light ink (irreversible)547rrrr
Available Indicators Table Key

HS = High Sensitivity, LS = Low Sensitivity

a. Other methyl ketones

b. Basic vapors impair the acid indicator

c. Other aromatic amines react with approximately the same sensitivity. Hydrazine and monomethyl hydrazine show color formation at 8.5ppb·hr. Unsymmetrical dimethyl hydrazine shows color formation at 60ppb·hr. No other interferences are known.

d. Mercury, stibine and other hydrides.

e. Acids impair the basic vapors indicator.

f. Mono methyl hydrazine, hydrazine and aromatic amines.

g. Carbonyl bromide, Benzoyl chloride, cyanuric chloride, methyl chloroformate and phosgene are known interferences. No other interferences are known.

h. Acrolein and aldehydes found in cigarette smoke react with approximately the same sensitivity. No other interferences are known.

i. Mono methyl hydrazine, dimethyl hydrazine (1,1) (UDMH) and aromatic amines

j. Hydrides and strong oxidizers.

k. Benzoyl chloride, carbonyl bromide, cyanuric chloride, ethyl chloroformate and phosgene are known interferences. No other interferences are known.

l. Hydrazine, dimethyl hydrazine (1,1) (UDMH) and aromatic amines.

m. Other nitrogen oxides and strong oxidizers.

n. Please contact us at info@chemteq.net

o. Hydrogen peroxide and nitrogen oxides.

p. Cyanuric chloride, Benzoyl chloride, carbonyl bromide, ethyl chloroformate and methyl chloroformate are known interferences. No other interferences are known.

q. Mercury, stilbene and other hydrides.

r. Irreversible quantification of ultra violet exposure.
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