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D6370-23 – Standard Test Method Technical Guide
📐 Standard Overview and Application
ASTM D6370-23, developed by Committee D11, provides a standard test method for compositional analysis of rubber using thermogravimetry (TGA). It is used to determine the amounts of organics (including oil and polymer), carbon black, and ash in rubber compounds. The standard emphasizes the use of SI units and calibrated instrumentation, and it is recognized internationally under WTO TBT principles. This method is applicable to rubber compounds and utilizes previously calibrated, manual or computer assisted TGA instrumentation.
⚠️ Important: This standard does not cover all safety aspects; users must establish appropriate safety, health, and environmental practices.
⚙️ Technical Definitions and Components
The standard defines key terms from Terminologies D1566, D3053, and E473. Specific definitions include:
- Ash: residue from incineration of a material under specified conditions, including nonvolatile additives.
- Carbon Black: an engineered material primarily composed of elemental carbon.
- Organics: organic components like polymers and all non-carbon black organic additives.
| 🟦 Term | 📏 Definition | ⚡ Source |
|---|---|---|
| Ash | Nonvolatile residue from incineration | D1566 |
| Carbon Black | Elemental carbon from hydrocarbon processes | D3053 |
| Organics | Organic components like polymers and additives | This standard |
📊 Procedure and Calibration Requirements
The test method involves heating the mass of the rubber sample at a controlled, specified rate in a controlled, specified environment. Calibration of equipment is mandatory, following practices like E1953. The method can be manual or computer-assisted. For separate determination of plasticizer/oil, Test Method D297 is used.
💡 Tip: Regular calibration of TGA instruments is essential for reproducible results.
Referenced standards include D297 for chemical analysis, D1566 for rubber terminology, D3053 for carbon black terminology, E473 for thermal analysis terms, and E1953 for apparatus description.
❓ Frequently Asked Questions
🔍 What is the primary purpose of D6370-23?
To determine the amounts of organics, carbon black, and ash in rubber compounds using TGA.
💡 Can this method determine plasticizer content?
Yes, separately using Test Method D297 as per Section 1.2.
⚡ What instrumentation is required?
Calibrated TGA instrumentation, manual or computer-assisted, as described in E1953.
📌 What units are used for reporting?
SI units are standard, as per Section 1.4.