---
type: "WebPage"
title: "Sameness analysis between two substances in laboratory"
description: "You want to perform a similarity analysis between two substances Why perform a sameness analysis? First of all, companies manufacturing and importing the same substance must carry out a joint registration. Thus, it is necessary to determine whether two substances..."
resource: "https://filab.fr/en/sectors-of-activity/laboratory-analysis-cosmetics/sameness-analysis-substances-laboratory/"
tags: ["EN", "pll_62b020fd1b8d8", "Anaïs DECAUX"]
timestamp: "2025-12-31T08:43:41Z"
published: "2022-06-20T07:57:10Z"
language: "en"
author: "Stage Filab"
---

# Sameness analysis between two substances in laboratory

## You want to perform a similarity analysis between two substances

### Why perform a sameness analysis?

First of all, companies manufacturing and importing the same substance must carry out a joint registration. Thus, it is necessary to determine whether two substances are identical by studying a number of criteria. Substances are considered to be identical if they are composed of the same main constituents, whereby the degree of purity of a substance does not influence the similarity. Furthermore, identical substances may have a different purity/impurity profile depending on their quality.

Therefore, the support of a competent laboratory in sameness analysis is indispensable in this kind of problem.

## FILAB supports you in sameness analysis between two substances

Through our three levels of services: analysis, expertise and R&D support, [FILAB](https://filab.fr/en/) assists companies from all sectors in their needs for sameness analysis between two substances on all types of matrices. FILAB provides its clients with the know-how and experience of its team, as well as a 2100m² [analytical park](https://filab.fr/en/our-technical-resources.md) equipped with state-of-the-art equipment.

 [Request a quote](https://filab.fr/en/contact-form.md)
## our technical means

[ToF-SIMS](https://filab.fr/en/our-technical-resources/laboratory-analysis-tof-sims.md)

[Mass Spectrometry](https://filab.fr/en/our-technical-resources/laboratory-analysis-mass-spectrometry.md)

[FTIR chemical analysis](https://filab.fr/en/our-technical-resources/laboratory-analysis-ftir-spectroscopy.md)

[Basic chemical analysis](https://filab.fr/en/our-services/our-analysis-services/chemical-analysis-laboratory/basic-chemical-analysis-laboratory.md)

[Ultra Performance Liquid Chromatography (UPLC)](https://filab.fr/en/our-technical-resources/laboratory-analysis-uplc.md)

[ICP analysis](https://filab.fr/en/our-technical-resources/laboratory-analysis-icp-icp-ms-icp-aes.md)