Chemical Name Triphenylmethane‑4,4',4''‑Triisocyanate, Ethyl Acetate Solution
Synonyms TTI, Desmodur RE, Methylidynetri‑p‑phenylene triisocyanate, Lekner adhesive
CAS Number (active substance) 2422‑91‑5
EC Number 219‑351‑8
Composition Triphenylmethane‑4,4',4''‑Triisocyanate: 27 %；Ethyl Acetate: ~73 %HS‑Code 2929109000
2. Chem‑Physical Properties (solution)
Appearance Yellow‑green to reddish‑brown / dark violet low‑viscosity liquid; minor crystalline deposits may occur at low temperature (redissolve at RT)
Odor Ester‑like solvent odor; pungent isocyanate odor
Density (20 °C) 0.97‑0.99 g/cm³
Viscosity (20 °C) ~3 mPa·s
Flash point (closed cup) ‑4 °C (dominated by ethyl acetate solvent)
Boiling point 77 °C (ethyl acetate)
Solubility Miscible with esters, ketones, aromatic solvents; reacts with water, alcohols, amines
Stability Moisture‑sensitive. Reacts with water releasing CO₂ and insoluble polyurea. Avoid air / moisture ingress. Color darkens under light, bonding performance remains unaffected
3. Quality Specification (Industrial Grade‑27 % solution)
| Test Item | Unit | Specification | Typical Result | Test Method |
|---|---|---|---|---|
| Appearance | — | Yellow‑green to reddish‑brown liquid | Complies | Visual |
| NCO Content (solution) | % | 9.1‑9.5 | 9.3 | Titration |
| Solid Content | % | 26.0‑28.0 | 27.0 | Oven evaporation |
| Viscosity @20 °C | mPa·s | 2‑5 | 3 | Rotational viscometer |
| Density @20 °C | g/cm³ | 0.97‑0.99 | 0.98 | GB/T‑4472 |
| Moisture | % | ≤0.10 | 0.06 | Karl‑Fischer |
4. Application & Use
High‑activity polyisocyanate cross‑linker / hardener for adhesives. Mainly for neoprene rubber adhesive, natural rubber, polyurethane adhesive systems.
Bonding between rubber‑metal, rubber‑plastic, rubber‑fabric; improve bond strength, heat‑resistance, hydrolysis‑resistance, oil‑resistance of adhesive joints.
Used in shoe‑making, rubber goods industry, composite material bonding.
Note: Mix with hydroxyl‑containing adhesive base material before use; isocyanate reacts with water / alcohol, avoid co‑existence.
5. Packing
Standard packing: 200 kg net steel drum
Alternative: 25 kg / 55 kg steel drum
6. Storage & Transportation
Storage
Store in cool, dry, well‑ventilated warehouse, temperature 10‑25 °C. Keep container tightly hermetically sealed. Strictly prevent moisture ingress.
Keep far from ignition sources, heat, open flame, oxidants, water, alcohols, amines.
Shelf‑life: minimum 6 months under recommended sealed storage.
Low‑temperature storage may produce crystal precipitates; re‑dissolve by warming to room temperature before use.
Transportation
UN‑Number：UN 1992
Hazard Class：3 (Flammable liquid), 6.1 (Toxic)
Packing group：II
Proper Shipping Name：Flammable liquid, toxic, n.o.s. (Triphenylmethane‑4,4',4''‑triisocyanate ethyl acetate solution)
GHS hazard statements: H225 Highly flammable liquid and vapour; H315 Causes skin irritation; H317 May cause an allergic skin reaction; H319 Causes serious eye irritation; H332 Harmful if inhaled; H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled.
Ground all equipment during transfer to eliminate static electricity. Avoid rain and moisture during transit.
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