---
title: Toluene Diisocyanate Sampling | Liquid Sampling Tools
description: Learn about toluene diisocyanate sampling and the benefits of our liquid sampling tools for safety and other details.
---

- [Home](https://www.biar.us/?hsLang=en-us)
- [Applications](https://www.biar.us/applications?hsLang=en-us)
- Toluene Diisocyanate

# SAMPLING TOLUENE DIISOCYANATE (TDI)

## Keeping Toluene Diisocyanate in a Liquid State

Toluene Diisocyanate (TDI) is used to manufacture foams, adhesives, sealants, coatings and elastomers. Although it has a low toxicity, the Occupational Safety and Health Administration (OSHA) has established limits on allowable TDI vapor concentrations in work environments.

## Why It's Important to Take TDI Samples

- To ensure proper temperatures for processing (can go above 300°C (572°F)
- To prevent solidification at ambient temperatures

## What to Look for in the Sample

- Fluidity
- Vapor Concentration

## How to Safely Take TDI Samples

- Multi-function stainless steel Inline Sample Valve with spring-to-close function
- Thread adapter or bottle support
- [Heating Jacket](https://www.biar.us/hubfs/1.060%20-%20Heating%20Jacket.pdf?hsLang=en-us)
- [Safety Cabinet (vented)](https://www.biar.us/hubfs/In-line%20valve%20and%20safety%20cabinet.pdf?hsLang=en-us)
- Safety Plug (for secondary containment)

![Toluene Diisocyanate Sampling | Liquid Sampling Tools](https://www.biar.us/hubfs/Toluene-Diisocyanate-Sampling-System.webp "Toluene Diisocyanate Sampling | Liquid Sampling Tools")

### Benefits of system components include:

- Safety Cabinet minimizes operator’s exposure to TDI fumes
- Valve Heating Jacket maintains TDI at process temperature
- Multi-Function Valve allows adapter to be quickly removed for cleaning purposes after each use (no special tools required)
- Operator has direct access to the stainless steel nipple for cleaning (adapter doesn’t need to be removed)

**TECHNICAL DATA**

▼

**Toluene Diisocyanate**

**1) Description**

**Name**: ..............................................................................................Toluene Diisocyanate

**Chemical Formula:** .....................................................................CH₃C₆H₃(NCO)₂

**CAS No:** ..........................................................................................584-84-9

**Other Names:** ...............................................................................TDI, 2,4-TDI, 2,4-Toluene diisocyanate

**Uses:** ...............................................................................................Industrial

**Physical state:** ..............................................................................Solid or liquid (above 71°F)

**Color:** ..............................................................................................Colorless to pale-yellow solid or liquid (above 71°F)

**Odor:** ...............................................................................................Strong, Pungent

**Boiling Point:** ................................................................................251°C (484°F)

**Melting Point:**.................................................................................21°C (71°F)

**Flash Point:** ....................................................................................126°C (260°F)

**Flammability (solid, gas)**: ..........................................................LEL 0.9% UEL 9.5%

**Vapor Pressure:**.............................................................................(77°F): 0.01 mmHg

 

**2) Hazards**

Immediately Dangerous to Life or Health Concentrations (IDLH) (NIOSH)  
Class IIIB Combustible Liquid: Fl.P. at or above 200°F.

This material is considered hazardous by the OSHA Hazard Communication Standard. The current OSHA permissible exposure limit (PEL) for TDI is 0.005 ppm as an 8-hour time- weighted average (TWA) concentration and as a ceiling concentration of 0.02 ppm.

**H315:** (100%): Causes skin irritation   
**H317:** (100%): May cause an allergic skin reaction   
**H318:** (36.18%): Causes serious eye damage   
**H319:** (63.82%): Causes serious eye irritation  
**H330:** (100%): Fatal if inhaled  
**H334:** (100%): May cause allergy or asthma symptoms or breathing difficulties if inhaled   
**H335:** (99.84%): May cause respiratory irritation   
**H351:** (100%): Suspected of causing cancer   
**H412:** (95.32%): Harmful to aquatic life with long lasting effects

 

**Reactivity**: Strong oxidizers, water, acids, bases & amines (may cause foam & spatter); alcohols [Note: Reacts slowly with water to form carbon dioxide and polyureas.]

**Specific Hazards related to Sampling: **TDI can solidify at ambient temperatures and when sampling, it is usually at high temperatures. Sample systems must incorporate a heating jacket to maintain process temperatures and adequate protection must be part of the design.  TDI is not highly toxic but exposure limits have been established by OSHA regarding allowable TDI vapor concentrations in the work environment. Sample systems must be designed to protect the Operators and the environment from vapors.

![hazardus-image](https://www.biar.us/hubfs/image-png.png)

 

[![Copy of BIAR_Dynamic CTA_EM_5](https://www.biar.us/hubfs/Copy%20of%20BIAR_Dynamic%20CTA_EM_5.gif "Copy of BIAR_Dynamic CTA_EM_5")](https://www.biar.us/rfq/-0?hsLang=en-us)

![webtraxs tracking pixel](https://www.webtraxs.com/webtraxs.php?id=biar&st=img)