ISO 1126:2015 PDF

Overview

ISO 1126:2015 specifies laboratory methods for determining the loss on heating of carbon black used as a rubber compounding ingredient. The loss on heating measures primarily moisture content (and traces of other volatiles) and is a key quality parameter for carbon black used in the rubber industry. The standard defines three accepted test methods - gravity‑convection oven (method 1), moisture balance (method 2), and infrared irradiation (method 3, rapid) - and identifies method 1 as the preferred procedure.

Key topics and technical requirements

• Scope & limitations
  • Applies to carbon blacks for rubber compounding; not applicable to treated carbon blacks that contain added volatile materials.
• Three test methods
  • Method 1 - Gravity‑convection oven (preferred):
    • Heat sample at 125 °C for 1 hour in a gravity‑convection oven; weigh before and after cooling in a desiccator to calculate percent loss on heating.
    • Typical test portion ~2 g; analytical balance accuracy to ±0.1 mg.
  • Method 2 - Moisture balance:
    • Indirect heating with a moisture balance at ≤125 °C; record mass loss when change is