TDI Trimer Polyisocyanate Curing Agents
Fast curing aromatic hardeners for 2K polyurethane coatings and adhesives
What This Product Is and Who Buys It
TDI trimer polyisocyanates are adducts and isocyanurates derived from toluene diisocyanate. They are high reactivity hardeners for two component polyurethane coatings, sealants and adhesives, chosen where rapid cure and cost matter more than long term colour stability.
Key Benefits
- High reactivity and rapid curing, shortening line cycle times
- Adjustable balance between hardness and flexibility across the four grades
- Suitable for both transparent and pigmented coating systems
- L75 at 13.3 percent NCO gives the highest reactive group content in the range
Where This Material Is Used
Who It Is For
- 2K polyurethane coating producers
- Industrial adhesive and sealant manufacturers
- Protective coating formulators working to a cost target
- Fast drying production line operators
Problems It Solves
- Production lines where cure speed limits throughput
- Adhesive systems needing high reactivity at an acceptable raw material cost
- Formulations that have to work in both clear and pigmented versions
Technical Features
- L75 TDI adduct at 75 percent in ethyl acetate, 13.3 percent NCO, equivalent weight 315
- IL 1351 BA and IL 1451 BA TDI isocyanurates at 51 percent in butyl acetate
- HL BA mixed TDI/HDI isocyanurate at 60 percent in butyl acetate, 10.5 percent NCO
- Viscosities from 250 to 2,200 mPa·s at 23 degrees C
Specifications
These figures are the manufacturer grade data as published for this product family. Anything not listed below has not been confirmed and is marked TBC on request rather than estimated.
| Product | Isocyanate | Type | Supply Form | NCO Content (%) | Equivalent Weight | Viscosity at 23°C (mPa·s) | Typical Applications |
|---|---|---|---|---|---|---|---|
| L75 | TDI | Adduct | 75% in EA | 13.3 | 315 | 1,600 | 2K PU coatings and adhesives |
| IL 1351 BA | TDI | Isocyanurate | 51% in BA | 8.0 | 525 | 1,600 | Fast-drying 2K PU coating hardener |
| IL 1451 BA | TDI | Isocyanurate | 51% in BA | 7.4 | 570 | 250 | Fast-drying 2K PU coating hardener |
| HL BA | TDI / HDI | Isocyanurate | 60% in BA | 10.5 | 400 | 2,200 | Clear and pigmented 2K PU coatings |
Grades listed are representative and not exhaustive. Ask for the batch certificate of analysis on the grade you intend to buy.
Packaging Storage and Shelf Life
- Supply Forms
- Solutions at 51 to 75 percent solids in ethyl acetate or butyl acetate
- Storage
- Original sealed containers protected from moisture
- Packaging
- Contact us for available drum formats on the grade you select
- Certification
- Batch certificate of analysis supplied with shipment
How to Work With This Product
- Pick the grade by required NCO content and viscosity rather than by name
- For clear and pigmented systems in the same line, HL BA covers both
- Confirm pot life against your polyol and ambient humidity
- Keep containers sealed, since these are solution grades and solvent loss changes the solids
How It Compares
Within the Curing Agent category this product is positioned by the numbers in the table above rather than by a marketing claim. Compare NCO content, viscosity, equivalent weight or hydroxyl value against the alternative you are considering, and if the two are close, ask us for both samples and decide on your own line.
Quality and Documentation
Quality control runs across incoming raw materials, production and finished product inspection. A batch certificate of analysis is supplied with every shipment. We are a supply and trading company working with named manufacturers and OEM partners, so certification held by the producing plant is provided on request per grade rather than claimed here as ours.
Customisation
Customised grades and packing formats are available through our OEM partners and specialised manufacturing facilities. Tell us the property you need to move and we will say whether it is a grade change, a packaging change or not possible.
Industries Using This Product
Protective coatings are bought on service life. The raw material decisions behind them are about crosslink density, film flexibility and how the system behaves once VOC limits tighten.
See Applications
Adhesive makers live between two constraints: open time long enough to apply the product, and final strength high enough to replace a mechanical fastener.
See Applications
TDI Trimer Questions
Will a TDI trimer hardener yellow?
It is aromatic chemistry, so yes, under UV exposure. Use it where the coating is interior, pigmented or not judged on long term colour. For exterior clearcoats specify HDI or IPDI trimer instead.
Which grade has the lowest viscosity?
IL 1451 BA at 250 mPa·s and 23 degrees C, with 7.4 percent NCO and an equivalent weight of 570.
What is the HL BA grade?
A mixed TDI/HDI isocyanurate at 60 percent solids in butyl acetate, 10.5 percent NCO and 2,200 mPa·s, listed for clear and pigmented 2K polyurethane coatings.
Can these be used in adhesives?
Yes. Polyurethane structural and industrial adhesives are a listed application, alongside 2K coatings and sealants.
Products Often Bought Alongside This One
Biuret and isocyanurate grades for light stable 2K polyurethane coatings
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Light resistant isocyanurate hardeners for high end decorative coatings
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The aromatic isocyanate behind flexible polyurethane foam
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The HB series for flexible high build light resistant polyurethane coatings
View SpecificationsRequest a Quote or a Sample of TDI Trimer
Samples take about 7 days and are free of charge with shipping at your cost. Production orders ship 20-30 days after the deposit is received.