A formulator inherits a working epoxy or polyurea system, opens the bill of materials, and finds a single amine hardener with one approved supplier and a 12-week lead time. The grade is a polyetheramine, the line runs on it, and a stockout idles the press. The question lands on the procurement desk: is this a proprietary molecule, or a generic chemistry available from more than one source? For polyetheramines the answer is almost always the second one, and this guide is how you confirm it, pick the right grade for a new formulation, and qualify a second source for an existing one.
The short version: A polyetheramine (also written polyether amine, or amine-terminated polyether) is a polyether chain capped on each end with a reactive primary amine group. Three structural variables set everything about how it behaves: the backbone (polypropylene glycol, PPG, is hydrophobic; polyethylene glycol, PEG, is water-soluble), the functionality (difunctional diamines, trifunctional triamines, or monofunctional monoamines), and the molecular weight (roughly 150 to 5,000). Higher molecular weight buys flexibility, toughness, and a longer working time at the cost of glass transition temperature (Tg), hardness, and chemical resistance. The widely specified grades are sold under a letter-plus-number code where the letter is the functionality and the number is the approximate molecular weight (a difunctional ~230 MW PPG diamine, a trifunctional ~440 MW triamine, and so on). Those grades are generic chemistries, second-sourceable, and the table below maps each RawSource grade to the comparable branded grade.
What a polyetheramine actually is
Strip away the trade names and a polyetheramine is a simple idea. Take a polyether glycol, the same family of flexible chains used in polyurethane polyols, and convert the terminal hydroxyl groups to primary amine groups by reductive amination. You end up with a flexible chain that reacts like an amine: it cures epoxy resins, builds the soft segment of polyureas, and chain-extends or flexibilizes other thermoset networks.
The amine is what makes it useful as a curing agent. An amine hydrogen opens an epoxide ring to build crosslinks, so a diamine (four amine hydrogens) and a triamine (six) behave very differently in a network. The polyether chain between the amine ends is what makes it different from a small amine like diethylenetriamine: it is long, flexible, and low in viscosity, so the cured network is tougher and more elastic and the uncured blend wets out and self-levels.
One practical detail drives reactivity. In the PPG-based diamines and triamines the primary amine sits on a secondary carbon next to a pendant methyl group, which sterically hinders it. That gives moderate, controllable reactivity: long pot life, low exotherm, and the ability to cast thick sections without cracking. The trade-off is real, and it is the one that trips people up: these grades cure slowly at ambient temperature and often need heat or an accelerator to reach full cure and full properties.
How backbone, functionality, and molecular weight set the properties
Three levers, and you can predict a grade’s behavior from them before you ever run a sample.
Backbone (PPG vs PEG). A PPG (polypropylene glycol) backbone is hydrophobic. It gives good water and chemical resistance in the cured film and is the default for coatings, composites, and elastomers. A PEG (polyethylene glycol) backbone is hydrophilic and water-soluble, which is the whole point of the ED and EDR families. Recommendation: choose PEG-based grades only when you specifically need water solubility, water dispersibility, or hydrophilicity, because that same affinity for water tends to lower the cured film’s moisture and chemical resistance.
Functionality (di vs tri vs mono). A difunctional diamine builds a linear, flexible, extensible network. A trifunctional triamine adds a branch point per molecule, which raises crosslink density, Tg, hardness, and chemical resistance while reducing elongation. A monofunctional monoamine cannot crosslink at all; it caps a chain end, so it works as a non-reactive flexibilizer, a chain stopper, or a surfactant-like modifier. Recommendation: blend a triamine into a diamine-cured system when you need to claw back Tg or solvent resistance without abandoning the toughness the polyether gives you.
Molecular weight. This is the dial for the flexibility-versus-hardness trade-off. A short ~230 MW diamine cures to a rigid, high-Tg, chemically resistant network. A ~2,000 or ~4,000 MW diamine cures to a soft, rubbery, low-Tg elastomer with high elongation and impact resistance but lower hardness, lower Tg, and reduced solvent resistance. Recommendation: pick the lowest molecular weight that still meets your flexibility and elongation target, since you pay for added flexibility in Tg and chemical resistance every time you go up the molecular-weight ladder.
Grade-by-grade equivalents
The branded grades that dominate the polyetheramine market use a letter-plus-number code: the letter is the functionality (D = diamine, T = triamine, M = monoamine, ED/EDR = PEG-based diamine) and the number is the approximate molecular weight. Because the underlying chemistries are generic, each grade has a like-for-like equivalent. The table maps the RawSource grade to the comparable branded grade and verified type, backbone, and approximate molecular weight.
| RawSource grade | Type / functionality | Backbone | Approx. MW | Comparable to | Typical use |
|---|---|---|---|---|---|
| polyetheramine D-230 | Diamine (difunctional) | PPG | ~230 | Jeffamine D-230 | Clear rigid-to-tough epoxy, flooring, composites, the workhorse grade |
| polyetheramine D-400 | Diamine | PPG | ~400 | Jeffamine D-400 | Tougher, more flexible epoxy; coatings; flexibilizer blends |
| polyetheramine D-2000 | Diamine | PPG | ~2,000 | Jeffamine D-2000 | Flexibilizer, elastomeric epoxy, polyurea soft segment |
| polyetheramine D-4000 | Diamine | PPG | ~4,000 | Jeffamine D-4000 | Long soft segment, elastomers, flexible sealants |
| polyetheramine T-403 | Triamine (trifunctional) | PPG (TMP-initiated) | ~440 | Jeffamine T-403 | Crosslinker for composites and coatings; higher Tg and chemical resistance |
| polyetheramine T-3000 | Triamine | PPG (glycerol-initiated) | ~3,000 | Jeffamine T-3000 | Flexible crosslink point, polyurea, reaction injection molding |
| polyetheramine T-5000 | Triamine | PPG | ~5,000 | Jeffamine T-5000 | Long soft segment with crosslink functionality, elastomers |
| polyetheramine ED-600 | Diamine | PEG (water-soluble) | ~600 | Jeffamine ED-600 | Hydrophilic, water-dispersible epoxy; flexible adhesion |
| polyetheramine ED-900 | Diamine | PEG | ~900 | Jeffamine ED-900 | Water-soluble, flexible, hydrophilic networks |
| polyetheramine ED-2003 | Diamine | PEG | ~2,000 | Jeffamine ED-2003 | Highly hydrophilic; surfactant and dispersant; water-based systems |
| polyetheramine M-1000 | Monoamine (monofunctional) | Predominantly PEG | ~1,000 | Jeffamine M-1000 | Chain stopper, non-reactive modifier, surfactant or dispersant |
| polyetheramine M-2070 | Monoamine | Predominantly PEG | ~2,000 | Jeffamine M-2070 | Water-soluble monoamine; dispersant; fuel and lubricant additive intermediate |
| polyetheramine EDR-148 | Diamine (high reactivity) | PEG (triethylene glycol) | ~148 | Jeffamine EDR-148 | Fast-reacting chain extender; cure accelerator or co-curative |
| polyetheramine EDR-176 | Diamine (high reactivity) | PEG | ~176 | Jeffamine EDR-176 | Fast cure chain extender, reactivity booster |
A note on the EDR grades: their amine groups sit on primary carbons rather than the sterically hindered secondary carbons of the D and T grades, which is why they react much faster. The trade-off is shorter pot life and higher exotherm, so they are most often dosed in small amounts to accelerate a slower D-series or T-series cure rather than used alone.
> Jeffamine® is a registered trademark of Huntsman Corporation. RawSource is not affiliated with, authorized, or endorsed by Huntsman; the brand names above are used only as a truthful nominative comparison, identifying the generic polyetheramine type and molecular weight that each RawSource grade matches. Confirm performance equivalence for your own formulation.
Selecting by application
The grade table tells you what each material is. Matching it to a job is where the trade-offs get decided.
Rigid, clear, chemically resistant epoxy (flooring, castings, tooling). Start with polyetheramine D-230. It cures water-white, low in viscosity for good self-leveling and high filler loading, and harder and more solvent-resistant than the higher-MW diamines. Its amine hydrogen equivalent weight is about 60, so a small weight of hardener cures a lot of resin. The honest limitation: ambient cure is slow and full chemical resistance usually needs a post-cure or a small dose of a faster co-curative.
Tough, flexible epoxy that resists chipping and thermal cycling. Move up the molecular-weight ladder to polyetheramine D-400, or blend in polyetheramine D-2000 as a flexibilizer. You gain elongation and impact strength and the ability to coat substrates with different expansion rates without delaminating. You give up Tg, hardness, and some chemical resistance, so blend rather than fully substitute when you still need a hard surface.
Polyurea and elastomeric systems. The high-MW PPG diamines and triamines (polyetheramine D-2000, polyetheramine T-3000, polyetheramine T-5000) are the classic soft-segment amines for spray polyurea and reaction injection molding. The triamines add a crosslink point that raises tear strength and recovery; the diamines keep the network more extensible. Tune the diamine-to-triamine ratio to trade elongation against modulus.
Water-based and hydrophilic systems. When you need the cured network or the uncured component to be water-soluble or water-dispersible, the PEG-backbone grades are the only ones that do it: polyetheramine ED-600, polyetheramine ED-900, and the highly hydrophilic polyetheramine ED-2003. They also serve as dispersants and surface modifiers. The trade-off is inherent: the same water affinity that makes them useful lowers the cured film’s water and chemical resistance, so they are a poor choice for a coating that must shrug off moisture.
Composites and laminating. polyetheramine D-230 and the trifunctional polyetheramine T-403 are common in wind-blade, infusion, and laminating systems where you want long working time, good fiber wet-out, and reduced micro-cracking under cyclic load. T-403’s branch point lifts Tg and chemical resistance relative to a straight diamine cure, at the cost of some toughness.
Fuel and lubricant additives. Monoamine and water-soluble grades such as polyetheramine M-2070 and polyetheramine M-1000 are used as intermediates and detergent components in gasoline and lubricant additive packages, where the polyether chain provides solubility and the single amine provides a reactive or surface-active site without crosslinking.
For the full amine-hardener picture, including the non-polyether cycloaliphatic and aliphatic amines, see our epoxy curing agent selection guide. If your finished part shows a greasy or hazy surface that resists recoat, that is usually amine blush, and polyether amines blush less than unmodified aliphatic amines.
Qualifying a second source
Same generic chemistry and the same molecular-weight class do not guarantee identical handling on your line, so treat a second source as a qualification, not a swap. Confirm the amine hydrogen equivalent weight on the Certificate of Analysis (CoA) and recheck your stoichiometry, because a small shift in equivalent weight moves your mix ratio. Then run pot life, peak exotherm, cure schedule, and the two or three end-use properties that actually gate your product (Tg, elongation, hardness, or chemical resistance, depending on the job) side by side against your incumbent before you release the grade.
Buying polyetheramines
RawSource supplies the full polyetheramine range, the PPG-based diamines and triamines (D-230, D-400, D-2000, D-4000, T-403, T-3000, T-5000), the PEG-based water-soluble grades (ED-600, ED-900, ED-2003), the monoamines (M-1000, M-2070), and the fast-reacting short-chain diamines (EDR-148, EDR-176), for coatings and industrial manufacturing formulators in drums, IBCs, and bulk with CoA documentation. Tell us the grade you run today or the property targets for a new system (flexibility, Tg, water resistance, cure speed), and request a sample to qualify it against your incumbent.
Frequently asked questions
What is a polyetheramine?
A polyetheramine, also called a polyether amine or an amine-terminated polyether, is a polyether chain (polypropylene glycol or polyethylene glycol) capped with one, two, or three primary amine groups. The amine ends make it react like a curing agent or chain extender, while the flexible polyether chain makes the cured network tough, elastic, and low in viscosity. It is used mainly to cure and flexibilize epoxy resins, to build the soft segment of polyureas, in composites, and as a fuel or lubricant additive intermediate.
Is there a polyetheramine equivalent to Jeffamine?
Yes. The widely specified Jeffamine grades are generic polyetheramine chemistries available from more than one producer. RawSource supplies grades that match them by functionality, backbone, and molecular weight, for example a difunctional PPG diamine of about 230 MW comparable to Jeffamine D-230, and a trifunctional triamine of about 440 MW comparable to Jeffamine T-403. Confirm the amine equivalent weight and run a side-by-side qualification before you release a second source. (Jeffamine is a Huntsman trademark; RawSource is not affiliated with or endorsed by Huntsman.)
What is the difference between the D, T, and ED series?
The letter is the functionality and backbone. D-series are difunctional diamines on a hydrophobic PPG backbone, the general-purpose epoxy and elastomer grades. T-series are trifunctional triamines, also PPG, which add a crosslink point for higher Tg and chemical resistance. ED-series are difunctional diamines on a hydrophilic PEG backbone, used specifically where you need water solubility or water dispersibility, with the trade-off of lower cured-film moisture resistance.
What does the number after the letter mean (for example, D-230)?
The number is the approximate average molecular weight. D-230 is a diamine of about 230, D-2000 a diamine of about 2,000, and T-5000 a triamine of about 5,000. Molecular weight is the main dial for flexibility: low numbers cure rigid and high-Tg, high numbers cure soft, elastic, and low-Tg with lower chemical resistance.
Which polyetheramine should I use for a flexible, tough epoxy?
Move up in molecular weight. Polyetheramine D-400 gives more flexibility and impact resistance than D-230, and D-2000 or D-4000 are used as flexibilizers blended into a harder system. The trade-off is that flexibility comes at the expense of Tg, hardness, and chemical resistance, so blend to hit your target rather than fully replacing a rigid hardener.
Why do PPG-based polyetheramines cure more slowly than small amines?
In the PPG-based D, T, and M grades the amine sits on a secondary carbon next to a methyl group, which sterically hinders it and gives moderate, controllable reactivity. That is an advantage for pot life, low exotherm, and casting thick sections, but it means slower ambient cure. Formulators often add a small amount of a faster amine such as the short-chain EDR grades, or apply heat, to drive full cure.
Editorial note. This article is general technical guidance for coatings, composites, and industrial formulation professionals. Grade behavior, equivalence, cure schedule, and end-use performance depend on your specific resin, ratio, process, and conditions and must be validated on your own system; the Certificate of Analysis governs the grade you buy. Molecular weights and equivalent weights cited are typical, nominal reference values, not a guaranteed specification. Amines are corrosive and can cause skin and eye burns and sensitization, so review the current Safety Data Sheet (SDS) and use appropriate PPE before handling. Brand names are used only for truthful nominative comparison to identify generic chemistry; RawSource is not affiliated with, authorized, or endorsed by the trademark owners named. Products are sold for industrial and professional use only. Nothing here is a medical, health, safety, or efficacy claim. RawSource makes no warranty, express or implied, and assumes no liability for use of this information.
