TDI SafeAir Color Comparator (383005)

The color comparator allows you to pinpoint the exposure dose of the gas when used with the standard badge.

*Does NOT come with the badge. Badge needs to be purchased additionally*

Note: we are not able to ship the badges overseas

Aromatic Isocyanate Information


Color change for Aromatic Isocyanates (TDI and MDI) is from off-white to red.

The SafeAir Aromatic Isocyanates badge may be used for personnel or area monitoring for exposure times ranging from 15 minute to 24 hours. Use this color comparator for monitoring for TDI, with the SafeAir aromatic isocyanates badge (part number: 382001-50). 


Repeated exposures or a single large dose may cause sensitization. Chronic overexposure has also been reported to cause lung damage including fibrosis. OSHA and NIOSH exposure limit for TDI is 0.02 ppm (TWA), the OSHA exposure limit for MDI is 0.02 ppm (ceiling) and the NIOSH exposure limit for MDI is 0.005 ppm (TWA).

Aromatic diisocyanates, such as toluene diisocyanate (TDI) and methylene diphenyl diisocyanate (MDI), are commonly used to make various polymers such as polyurethanes. Polyurethanes have significant application in the manufacture of rigid and flexible foams. They are also used in the production of adhesives, coatings, and elastomers. Polyurethane coatings are preferred in the automotive refinishing industry where high performance coatings are required.

Principle of Operation

The SafeAir aromatic isocyanates badge is a monitoring system designed to indicate the presence of TDI and/or MDI at concentrations below the permissible exposure limit. The SafeAir aromatic isocyanates badge is designed to detect the presence of TDI and/or MDI by forming a color change in the shape of an exclamation mark inside the triangle. This exclamation mark is produced by a color-forming reaction, which occurs when TDI and/or MDI react with a flat indicator layer.

 SafeAir chemical detection badges are a visual indication badge that alerts you with a color changing exclamation mark when there is a specific chemical hazard.

Operating Instructions

1. Remove the pouch from the refrigerator and allow it to warm to room temperature.

2. Remove the badge from its protective pouch.

3. For personnel monitoring, attach the badge near the user’s breathing zone (i.e. the collar) with the front side exposed to the surrounding atmosphere.

4. For area monitoring, attach the badge to a stand and mount in a centralized area with the front side exposed to the surrounding atmosphere.

5. The exclamation mark appears within the triangle when TDI and/or MDI are present. Please note that the exclamation mark will appear on the front of the badge.

6. To obtain the average concentration, divide the exposure dose (ppb∙hr) by the exposure time in hours (hr).


The ChromAir aromatic isocyanates monitor should be refrigerated in its sealed bag at all times.

Sampling Parameters


Color Change

off-white to red

Exposure dose (Badge)

5 ppb-hr

3.5 ppb-hr

Exposure dose (Badge with color comparator)

5 – 140 ppb∙hr


Minimum detectable limit (8 hours)

0.6 ppb

0.4 ppb

Maximum recommended sampling time

24 hours

Minimum recommended sampling time

15 minutes

Relative humidity range

11% - 87%

Face velocity range

10 - 100 cm/sec

Temperature range

60ºF - 91ºF

Light effect - UV (direct sunlight)

not recommended above 4 hours

Light effect - visible

no effect

Color stability

2 weeks

Refrigerated shelf life

1 year


Downloads and Links

383005 & 382001 Manual

Aromatic Isocyanate Information

More Information
Manufacturer Morphix
Call For Price No
Gas Aromatic Isocyanates (TDI & MDI)
Operational Temperature Range 60°F - 91°F
Operational RH Range 11% - 87%
Maximum Exposure TDI: 5.0 ppb-hr MDI: 3.5 ppb-hr
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