Vinyl Ester URE
Grade
URE = urethane-modified vinyl ester
Use for high HDT with good toughness/adhesion in pultrusion, gratings and cured-in-place liners.
Values for the URE condition
Other Vinyl Ester grades and fills
Vinyl Ester is listed in 10 conditions; see the grade overview at Vinyl Ester.
Compare all 10 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Mineral/silica-filled vinyl ester | For acid-proof floor mortars, brick-lining bedding and thick trowelled coatings where shrinkage and cost must drop. | — | 30 | 0.6 | — |
Elastomer-modified (rubber-toughened) vinyl ester | Choose for impact, abrasion, thermal-shock and adhesion-critical linings; trades ~15 °C of HDT for toughness. | — | 76 | 9 | — |
Flame-retardant vinyl ester (brominated or ATH-filled), UL 94 V-0 /… | Required for ducting, scrubbers, mass transit and offshore FRP where fire code applies. | — | 76 | 4.5 | — |
Novolac (phenolic) epoxy vinyl ester | Pick when service exceeds ~100 °C or the medium contains hot acids, solvents or oxidizers. | — | 78 | 3.5 | — |
UREThis page Urethane-modified vinyl ester | Use for high HDT with good toughness/adhesion in pultrusion, gratings and cured-in-place liners. | — | 80 | 6 | 88 Shore D |
Low-styrene-emission / low-VOC vinyl ester | Choose for open-mold shop work under VOC limits; mechanical properties near standard grade but interlaminar bonding needs sanding. | — | 80 | 5 | 87 Shore D |
NEATDefault Neat cast resin | Default general-purpose corrosion resin for tanks, pipe and FRP linings up to ~95 °C. | — | 84 | 5.5 | 88 Shore D |
Glass-reinforced laminate, ~30 wt% chopped strand mat | Standard corrosion-tank/pipe laminate body: isotropic, easy to build up, moderate strength. | — | 120 | 1.8 | — |
Glass-reinforced, ~55–65 wt% continuous roving | Highest structural efficiency for pressure pipe, tank hoop layers and pultruded profiles; properties are directional. | — | 550 | 2 | — |
Carbon-fiber reinforced vinyl ester laminate | Niche stiffness-critical corrosion/marine parts and VARTM structures where glass is too flexible. | — | 1,000 | 1.2 | — |
What is Vinyl Ester URE?
Vinyl Ester URE is Vinyl Ester in the URE grade — use for high HDT with good toughness/adhesion in pultrusion, gratings and cured-in-place liners. Vinyl Ester URE has a tensile strength of 80 MPa (11.6 ksi), stronger than 83% of polymer grades. Elongation at break is 6% and the elastic modulus is 3.4 GPa (0.493 Msi). Vinyl Ester URE has a density of 1.14 g/cm³ (0.0412 lb/in³), lighter than 60% of polymer grades. Its glass-transition temperature is 140°C (284 °F). NEAT is the default condition FabDigit quotes; URE is available on request or by drawing note.
Advantages
- Stiff — 3.4 GPa (0.493 Msi), better than 82% of polymer grades
Limitations
- Limited formability — 5/100, worse than 95% of polymer grades
- Difficult to weld — 5/100, worse than 89% of polymer grades
- Low fracture toughness — 1 MPa·√m (0.91 ksi·√in), worse than 87% of polymer grades
- High mold shrinkage — 2%, worse than 81% of polymer grades
Vinyl Ester URE properties
Typical room-temperature values for Vinyl Ester URE; 24 are specific to this condition. Other listed values are Vinyl Ester reference data and may not represent this condition. Bars are the position among polymer grades.
Physical5
Vinyl Ester URE has a density of 1.14 g/cm³ (0.0412 lb/in³), lighter than 60% of polymer grades. Its glass-transition temperature is 140°C (284 °F).
Mechanical15
Vinyl Ester URE has a tensile strength of 80 MPa (11.6 ksi), stronger than 83% of polymer grades. Elongation at break is 6% and the elastic modulus is 3.4 GPa (0.493 Msi).
Thermal10
Vinyl Ester URE is rated for continuous service to 110°C (230 °F). It conducts heat at 0.2 W/m·K (0.116 BTU/hr·ft·°F), worse than 56% of polymer grades. Thermal expansion is 60 µm/m·K (33.3 µin/in·°F).
Electrical7
Vinyl Ester URE is an electrical insulator with a dielectric strength of 17 kV/mm (431.8 V/mil) and a resistivity of 1×10¹³ Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (84/100), better than 58% of polymer grades. UV resistance is fair.
Sustainability4
Producing a kilogram of Vinyl Ester URE takes about 80 MJ of energy and emits 5 kg of CO₂ — less than 85% of polymer grades. Typical recycled content is 0%.
Manufacturability6
Vinyl Ester URE's machinability is good (55/100, worse than 64% of polymer grades); weldability not recommended (5/100); formability not recommended (5/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Vinyl Ester URE
Is Vinyl Ester easy to machine?
Cut/drill cured laminate with carbide or PCD tooling, low feed and dust extraction — the styrene-cured matrix chips and glass is highly abrasive.
Can Vinyl Ester be welded?
Not weldable; joints are made by secondary hand lay-up (butt-strap) or by methacrylate/epoxy structural adhesive on sanded, solvent-wiped surfaces.
Can Vinyl Ester be formed, bent or molded?
Processed liquid by hand lay-up, spray-up, filament winding, pultrusion, RTM/VARTM; MEKP 1–2 phr with cobalt promoter, gel 15–30 min at 25 °C, then post-cure 2–4 h at 80–120 °C to reach full Tg and chemical resistance.
What surface finishes work on Vinyl Ester?
Finish with a resin-rich veil/C-glass surfacing layer or pigmented gel coat; wax-free layers must be sanded before recoating, and outdoor parts need a UV-stabilized topcoat or paint.
Vinyl Ester chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| bisphenol-A epoxy methacrylate oligomer novolac-epoxy methacrylate in high-temperature grades | 50 – 65 | 58 |
| styrene (reactive diluent)some grades substitute vinyl toluene / low-VOC diluents | 33 – 45 | 40 |
| inhibitor (hydroquinone type)shelf-life stabiliser | 0.01 – 0.05 | 0.02 |
| cobalt octoate / DMA acceleratorpre-promoted grades | 0.1 – 0.5 | 0.3 |
| MEKP initiator (added at use)phr on resin, room-temperature cure | 1 – 2 | 1.5 |
| brominated bisphenol-A backbone (FR gradwith Sb2O3 synergist for V-0 | 0 – 20 | 0 |
| glass fiber (laminate variants)E-glass or ECR-glass CSM / roving | 0 – 65 | 30 |
Vinyl Ester URE — frequently asked
What is Vinyl Ester URE used for?
Vinyl Ester URE is typically used for chemical storage tanks/piping, corrosion-resistant composite linings and marine composites. In short: corrosion-grade FRP matrix; tougher than polyester; cheaper than epoxy.
What is the tensile strength of Vinyl Ester URE?
Vinyl Ester URE has a typical tensile strength of 80 MPa (11.6 ksi) — stronger than 83% of polymer grades. Strength varies by condition: see the 10 listed tempers.
Is Vinyl Ester URE easy to machine?
Reasonably — machinability is rated good (55/100, worse than 64% of polymer grades). Cut/drill cured laminate with carbide or PCD tooling, low feed and dust extraction — the styrene-cured matrix chips and glass is highly abrasive.
Can Vinyl Ester URE be welded?
Not readily — weldability is rated not recommended (5/100). Not weldable; joints are made by secondary hand lay-up (butt-strap) or by methacrylate/epoxy structural adhesive on sanded, solvent-wiped surfaces.
What surface finishes work on Vinyl Ester URE?
Finish with a resin-rich veil/C-glass surfacing layer or pigmented gel coat; wax-free layers must be sanded before recoating, and outdoor parts need a UV-stabilized topcoat or paint.
Can Vinyl Ester URE be formed, bent or molded?
Processed liquid by hand lay-up, spray-up, filament winding, pultrusion, RTM/VARTM; MEKP 1–2 phr with cobalt promoter, gel 15–30 min at 25 °C, then post-cure 2–4 h at 80–120 °C to reach full Tg and chemical resistance.
What is the maximum service temperature of Vinyl Ester URE?
Vinyl Ester URE is rated for continuous use to about 110°C (230 °F), and briefly to 120°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- Derakane and Derakane Momentum epoxy vinyl ester resins — product and chemical resistance guides — Ashland / INEOS Composites (2022)
- ASTM D638 / D790 / D648 / D256 / D570 test methods for plastics — ASTM International (2022)
- ASTM C582 — Contact-Molded Reinforced Thermosetting Plastic Laminates for Corrosion-Resistant Equipment — ASTM International (2021)
- Engineered Materials Handbook, Vol. 2: Engineering Plastics / Vol. 1 Composites — ASM International (1988)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.