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Surrogate standards for aromatic amine detection in textile fibres, produced for laboratories testing textile articles according to REACH Annex XVII restrictions and EN ISO 14362 methods.
Seven quality control standards for azo dye analysis, designed for use as surrogate standards in EN ISO 14362 test methods. Each material is produced with documented concentration values for reliable calibration and method validation.
Azo dyes are synthetic colorants built around one or more nitrogen-nitrogen double bonds, known as the azo group. They are the dominant dye class in global textile manufacturing, accounting for roughly 70% of all dyes used in the industry. That prevalence reflects real advantages: azo dyes are relatively inexpensive to produce, cover a broad colour range and bond well to both natural and synthetic fibres.
The chemistry that makes them useful is also what makes certain azo dyes a regulatory concern. Under specific conditions, including contact with sweat or saliva, some azo compounds break down and release aromatic amines. Several of these amines are classified as carcinogenic, mutagenic or reprotoxic. The breakdown does not happen with all azo dyes, but for the restricted subset, the potential for human exposure through prolonged skin contact with dyed textiles is well established.
That is the starting point for azo dye regulation in textiles, and the reason why analytical laboratories working with textile products need reliable testing materials to detect and quantify aromatic amines at the concentrations defined by legislation.
The regulatory concern is not with azo dyes as a class but with the specific aromatic amines they can release. REACH Annex XVII Entry 43 lists 22 aromatic amines that are restricted in textile and leather articles placed on the EU market. If a dye can release any of those amines above 30 mg/kg under the reductive cleavage conditions defined by EN ISO 14362, the article cannot be placed on the market.
Verifying compliance with that limit requires a quantitative analytical method. And a quantitative method requires calibration materials with known, traceable concentration values. That is where surrogate standards become essential: they allow the laboratory to monitor not just the concentration of target amines but the efficiency of the extraction and cleavage process itself, which is critical for a valid result.
For laboratories running routine azo dye testing on textile articles, import goods or production samples, the quality of the surrogate standard directly affects the reliability of the result.
The standards in this catalogue are deuterium-labelled analogues of aromatic amines commonly encountered in azo dye analysis. Deuterated compounds are used as surrogate standards because their chemical behaviour through the extraction and cleavage process closely mirrors that of the unlabelled target amines, while remaining distinguishable by mass spectrometry.
The catalogue includes deuterated analogues of Oil Orange SS, Sudan II, Sudan Red G and several naphthalenesulfonic acid disodium salt compounds, covering the aromatic amine families most frequently encountered in EN ISO 14362 testing. All materials are produced by CIFGA with documented concentration values and full traceability from production to certificate.
For laboratories that need a specific compound, concentration or solvent system outside this range, custom production is available through our tailored services. The process starts with a direct conversation with the team.
Textile chemical restrictions are not a single framework. They are a patchwork of legislation that overlaps across markets, and the testing requirements that follow from them depend on which substances are in scope, which end use applies and where the product is being sold.
Entry 43 of REACH Annex XVII prohibits placing on the EU market any textile article that can release, under the reductive conditions of EN ISO 14362, any of the 22 listed aromatic amines above a concentration of 30 mg/kg. The restriction applies to articles intended for prolonged skin contact, including clothing, bedding and reusable bags.
Laboratories testing compliance with Entry 43 need calibration standards with traceable concentration values, and surrogate standards to validate the efficiency of the reductive cleavage step, which is the most technically sensitive part of the method.
EN ISO 14362 defines the extraction and analytical conditions for detecting restricted aromatic amines in textile fibres. Parts 1 and 3 of the standard cover different fibre types and extraction conditions. In both cases, the method requires calibration with reference solutions of known concentration and the use of surrogate standards to monitor sample preparation performance.
An azo dye test is an analytical procedure used to detect aromatic amines that can be released from azo colorants in textile articles. The most widely used method is EN ISO 14362, which involves reductive cleavage of the azo bond followed by extraction and chromatographic analysis of the released amines.
A surrogate standard is a labelled analogue of a target compound, typically deuterium-labelled, added to a sample before extraction. It travels through the entire sample preparation process alongside the analytes and allows the laboratory to calculate recovery and monitor the efficiency of the extraction and cleavage steps. In azo dye testing, surrogate standards are commonly used to monitor recovery and sample preparation performance under EN ISO 14362 workflows.
REACH Annex XVII Entry 43 lists 22 aromatic amines, including aniline, o-toluidine, 2-naphthylamine, benzidine and 4-aminoazobenzene, among others. The full list is set out in the annex to Entry 43. Any textile article that can release these amines above 30 mg/kg under reductive cleavage conditions is prohibited from the EU market.
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