ISO 4650:2012规定了两种识别橡胶（包括热塑性弹性体）的方法，无论是在未加工状态下，还是以硫化或未硫化混合物的形式。第一种方法基于使用透射技术的红外光谱检测。第二种方法利用反射率分析。 比较了反射（衰减总反射，ATR）和透射（胶片）产生的光谱。 这两种方法都包括通过热解产物（热解产物）或通过溶液浇铸或通过模塑获得的薄膜（仅适用于生橡胶）对聚合物进行检查。 给出了典型光谱。 指定的方法仅为定性方法。

ISO 4650:2012 specifies two methods for the identification of rubbers, including thermoplastic elastomers, either in the raw state or in the form of vulcanized or unvulcanized mixes. The first method is based on infrared spectrometric examination using the transmission technique. The second method makes use of analysis by reflectance. A comparison of the spectra resulting from reflectance (attenuated total reflectance, ATR) and transmission (film) is given. Both methods comprise examination of polymers by their pyrolysis products (pyrolysates), or by films cast from solution or obtained by moulding (for raw rubbers only). Typical spectra are given. The methods specified are qualitative methods only.