---
type: "WebPage"
title: "Determination of cross-linking kinetics by DSC according to ASTM E698"
description: "Your needs: determination of cross-linking kinetics by DSC in accordance with ASTM E698 What are kinetics ? Kinetics is the study of the speeds of reactions or transformations, and the factors that influence these speeds. In materials science and chemistry,..."
resource: "https://filab.fr/en/our-services/our-analysis-services/polymer-materials-analysis-laboratory/determination-kinetics-dsc-astm-e698/"
tags: ["EN", "pll_67408f794d5cd", "Thomas GAUTIER"]
timestamp: "2025-12-31T08:33:40Z"
published: "2024-11-22T14:31:09Z"
language: "en"
author: "Laure Durieux"
---

# Determination of cross-linking kinetics by DSC according to ASTM E698

## Your needs: determination of cross-linking kinetics by DSC in accordance with ASTM E698

### What are kinetics ?

**Kinetics** is the study of the **speeds of reactions or transformations**, and the factors that influence these speeds. In materials science and chemistry, cross-linking kinetics enables us to understand **how and at what speed a system evolves towards a new state** when it undergoes a change, such as an input of thermal energy.

### What does ASTM E698 say about the determination of cross-linking kinetics by DSC?

**ASTM E698** is a standard method that describes the procedure for determining the **kinetic parameters** of a chemical reaction by thermal analysis. More specifically, it concerns the determination of the **activation energy (Ea)** and the **pre-exponential frequency constant (A)** using data obtained by **differential scanning calorimetry ([DSC](https://filab.fr/en/our-technical-resources/laboratory-analysis-dsc-calorimetric.md))**.

The kinetics analysis is carried out by DSC and applies to well-defined exothermic reactions (**cross-linking, crystallisation**).

### Methodology for determining cross-linking kinetics by DSC according to ASTM E698

Thanks to several tests carried out at different temperature ramps, it is possible to extrapolate the results to estimate the kinetic parameters of the reaction. The activation energy for a given conversion rate is then measured.

The kinetic parameters can then be used to make predictions:

- **Conversion curves** to estimate the evolution of the conversion rate as a function of time at specific temperatures.
- **Isoconversion curves** to evaluate the time-temperature pairing required to achieve a given conversion rate.

***Step 1**: Analysis of a sample using different ramps to determine the kinetic parameters*

 ![](https://filab.fr/wp-content/uploads/2024/12/cinetique-dsc-etape1.jpg)
***Step 2** : Using kinetic parameters to draw prediction curves*

 ![](https://filab.fr/wp-content/uploads/2024/12/cinetique-dsc-2.jpg) ![](https://filab.fr/wp-content/uploads/2024/12/cinetique-dsc-3.jpg)
## FILAB can help you determine cross-linking kinetics by DSC in accordance with ASTM E698

### Applications of the ASTM E698 standard

The predictive aspect of the ASTM E698 standard makes it possible to **optimise** various processes and, consequently, to **reduce losses (time savings, energy savings)**:

- **Design**: optimisation of processing conditions (cross-linking, crystallisation).
- **Storage**: study of the thermal stability of raw materials or active substances.
- **Safety**: identification of decomposition thresholds for sensitive materials.

### Why choose FILAB for the determination of cross-linking kinetics by DSC according to ASTM E698?

Our laboratory, at the forefront of polymer materials [research and development](https://filab.fr/en/our-services/rd/rd-support/), offers innovative services tailored to a range of industries.

Thanks to our advanced expertise and technical resources, we are able to conduct research into the synthesis, **characterization of polymers**and their improvement, enabling industries to optimise their production processes and innovate in terms of [materials choice](https://filab.fr/en/our-services/rd/laboratory-support-in-the-choice-of-materials-and-raw-materials/).

In this way, we help our industrial partners to develop polymers that are more resistant, durable and environmentally friendly, by meeting specific needs such as improving thermal resistance, flexibility or [biocompatibility](https://filab.fr/en/our-services/our-expertise-services/laboratory-biocompatibility-testing.md).

## FAQ

 What is the calculation method for determining kinetics by DSC according to ASTM E698?
The method is based on **Friedman's** principle and **Kissinger's** model, which relate the heating rate to the activation energy. These calculations make it possible to:

- Determine the **activation energy** (Ea).
- Estimate the pre-exponential constant (A) of the **Arrhenius model.**

 What are the differences between ASTM E1641 and ASTM 698?
- **ASTM E698** is more general and covers a wide range of materials subjected to chemical or thermal reactions. It determines several kinetic parameters.
- **ASTM E1641**, on the other hand, focuses specifically on the activation energy associated with mass loss under conditions of thermogravimetric analysis of [cross-linking kinetics by ATG](https://filab.fr/en/our-services/our-analysis-services/polymer-materials-analysis-laboratory/determination-kinetics-atg-astm-e1641.md).