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TG-EGA

What is TG-EGA?

TG-EGA (Thermogravimetry–Evolved Gas Analysis) combines thermogravimetric analysis (TG/TGA) with real-time identification of gases released during heating. While TG shows when a sample loses (or gains) mass as temperature changes, EGA reveals what gases are released, helping pinpoint the cause of each weight-change step.

Depending on project needs, EGA may be implemented using:

  • TG-FTIR: identifies evolved gases by infrared spectra (good for many functional groups and organics)

  • TG-MS: tracks evolved gases by mass-to-charge signals (high sensitivity and fast response)

  • TG-GC/MS (optional): separates complex mixtures for detailed identification (project-dependent)

TG-EGA is widely used for polymers, adhesives, coatings, composites, battery materials, powders, and unknown residues to understand decomposition mechanisms, volatiles, contamination, and thermal stability.

What TG-EGA Can Help You Solve

  • Identify evolved gases from each mass-loss step (moisture, solvents, monomers, additives, decomposition products)

  • Root-cause analysis of unexpected weight loss or odor during heating/processing

  • Outgassing evaluation for vacuum/clean applications (process residues, low-level volatiles)

  • Thermal decomposition mechanism understanding (multi-step reactions, oxidation vs pyrolysis pathways)

  • Material comparison (lot-to-lot, supplier comparison, before/after aging or cleaning)

  • QC screening using characteristic gas signatures and onset temperatures

Typical Applications

  • Polymers & composites: plasticizer loss, stabilizer/additive breakdown, polymer backbone decomposition products

  • Adhesives/coatings/resins: solvent residue, cure byproducts, thermal breakdown and odor contributors

  • Semiconductor & electronics materials: outgassing/contamination screening for high-clean processes

  • Battery & energy materials: binder burn-off, surface species, thermal stability screening (project-dependent)

  • Inorganics & powders: dehydration/decarbonation byproducts, residual organics, process contamination

  • Unknown residues/foreign materials: rapid thermal “fingerprinting” plus gas identification

Test Capabilities & What You Receive

Measurement Outputs

  • TG curve: mass (%) vs temperature/time

  • DTG (optional): mass-loss rate vs temperature

  • EGA signals: FTIR spectra and/or MS ion traces vs temperature/time

  • Gas identification summary linked to each TG mass-loss step

Atmospheres & Programs (project-dependent)

  • Inert (N₂/Ar): pyrolysis/decomposition without oxidation

  • Oxidative (air/O₂): oxidation and burn-off behavior

  • Custom heating profiles: ramps, isothermal holds, multi-stage programs

Deliverables

  • TG/DTG plots + EGA plots (spectra and/or ion traces)

  • Identified/assigned evolved gases (project-dependent confidence level)

  • Step-by-step interpretation: “which gas corresponds to which weight-loss event”

  • Comparative conclusions across samples/conditions (optional)

Sample Requirements

  • Sample types: powders, solids, films, fibers, cured resins, residues

  • Typical amount: usually 5–30 mg (varies by material and method)

  • Condition: dry and homogeneous when possible; avoid contamination

  • Safety & compatibility: provide SDS for unknown/hazardous samples; confirm no highly reactive/explosive materials

  • Information to provide: expected composition (if known), target temperature range, desired atmosphere, and your key question (e.g., “identify odor source,” “verify solvent residue,” “compare supplier batches”)

Workflow

  1. Requirement review (goal, atmosphere, temperature range, target volatiles)

  2. Method selection (TG-FTIR / TG-MS / optional TG-GC/MS)

  3. Program setup (heating rate, holds, gas flow, transfer line conditions)

  4. Measurement (TG acquisition + real-time evolved gas monitoring)

  5. Data interpretation (assign gas signals to TG steps; compare samples)

  6. Report delivery (plots + identified gases + conclusions + recommendations)

FAQs

TGA shows how much mass changes and when it changes. TG-EGA additionally identifies what gases are released, enabling more confident interpretation of each mass-loss step.

  • TG-FTIR is strong for functional-group identification (e.g., CO₂, H₂O, organics with IR signatures).

  • TG-MS offers high sensitivity and fast response, but some species can overlap at the same m/z.
    We recommend the best option based on your materials and target gases; complex mixtures may benefit from TG-GC/MS.

Often yes—especially when the solvent produces distinct FTIR features or MS fragments. Detection limits depend on matrix, test settings, and background.

TG-EGA is typically qualitative to semi-quantitative. Absolute quantification generally requires calibration standards and controlled conditions; feasibility depends on target gases.

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