E-44
E-44 is a bisphenol-A (DGEBA) epoxy resin designated to GB/T 13657, run at a greater crosslink density than E-51 and chosen for adhesives and coatings that need higher chemical resistance.
Reference datasheet — E-44 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the NEAT condition
E-44 grades and fills
E-44 is supplied in 9 conditions, soft to hard. NEAT is the default FabDigit quotes; the values on this page are for it.
Compare all 9 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Conductive / ESD filled | Static-dissipative floorings, coatings and potting where charge build-up must be avoided. | 45 | 1.2 | 88 Shore D | |
Rubber-toughened | Pick when peel strength and crack resistance matter more than stiffness and heat resistance — structural adhesives. | 50 | 9 | ||
Solution / coating grade | Supplied pre-dissolved for anticorrosion primers, tank linings and epoxy-ester/amine-cured paints. | 50 | 3 | 82 Shore D | |
Mineral / fused-silica filled potting compound | Use for electronic potting and tooling where low CTE, low shrinkage and better heat removal are required. | 55 | 1.2 | ||
Flame-retardant formulation | Required for electrical potting, cable joints and laminates that must meet UL 94 V-0 / GB fire codes. | 58 | 3 | 88 Shore D | |
NEATDefault Neat / unfilled amine-cured casting | Baseline E-44 cured with an aliphatic/polyamide amine hardener — adhesives, primers, small castings. | 62 | 4.5 | 85 Shore D | |
Anhydride-cured (MTHPA/MeHHPA) casting | Choose for electrical casting/potting where higher Tg, low dielectric loss and low colour are needed. | 70 | 3 | 88 Shore D | |
Glass-fibre reinforced laminate / FRP | Structural laminates, tanks, insulating boards — huge strength gain but anisotropic and abrasive to tooling. | 350 | 2 | ||
Carbon-fibre reinforced laminate | For high specific stiffness and near-zero CTE structures; costly and electrically conductive (galvanic risk with Al). | 900 | 1.3 |
What is E-44?
E-44 is a bisphenol-A (DGEBA) epoxy resin designated to GB/T 13657, run at a greater crosslink density than E-51 and chosen for adhesives and coatings that need higher chemical resistance. The cured base resin gives about 62 MPa tensile strength, 4.5 % elongation and 100 °C maximum service temperature, with neat, anhydride-cured, toughened, mineral-filled, glass- and carbon-reinforced, flame-retardant, solvent-cut and ESD conditions on file. Limits are those of any thermoset: no remelting or welding, exotherm restrictions on thick pours, and UV chalking without a topcoat. E-51 is the alternative when lower viscosity and easier fibre wet-out matter more. E-44 has a density of 1.18 g/cm³ (0.0426 lb/in³), heavier than 50% of polymer grades. Its glass-transition temperature is 105°C (221 °F). E-44 has a tensile strength of 62 MPa (8.99 ksi), stronger than 70% of polymer grades. Elongation at break is 4.5% and the elastic modulus is 3.1 GPa (0.45 Msi).
What is E-44 used for?
- structural adhesives
- protective coatings
- composite matrix resin
- tooling compounds
Advantages
- Polishes to a fine finish — 70/100, better than 77% of polymer grades
Limitations
- Low fracture toughness — 0.6 MPa·√m (0.546 ksi·√in), worse than 96% of polymer grades
- Degrades in UV without stabilisers — 25/100, worse than 76% of polymer grades
- Limited ductility — 4.5%, worse than 75% of polymer grades
E-44 properties
Typical room-temperature values for E-44-NEAT; bars are the position among polymer grades.
Physical5
E-44 has a density of 1.18 g/cm³ (0.0426 lb/in³), heavier than 50% of polymer grades. Its glass-transition temperature is 105°C (221 °F).
Mechanical15
E-44 has a tensile strength of 62 MPa (8.99 ksi), stronger than 70% of polymer grades. Elongation at break is 4.5% and the elastic modulus is 3.1 GPa (0.45 Msi).
Thermal10
E-44 is rated for continuous service to 100°C (212 °F). It conducts heat at 0.19 W/m·K (0.11 BTU/hr·ft·°F), worse than 68% of polymer grades. Thermal expansion is 60 µm/m·K (33.3 µin/in·°F).
Electrical7
E-44 is an electrical insulator with a dielectric strength of 18 kV/mm (457.2 V/mil) and a resistivity of 1×10¹³ Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 65% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of E-44 takes about 137 MJ of energy and emits 6.5 kg of CO₂ — more than 80% of polymer grades. Typical recycled content is 0%.
Manufacturability4
E-44's machinability is good (60/100, better than 51% of polymer grades).
Common Calculations4
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the polymer family
Yield strength against density for every polymer grade FabDigit runs. E-44 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with E-44
Is E-44 easy to machine?
Cured castings drill/turn/mill with sharp carbide, low feed and good chip clearance; keep tools cool to avoid softening near Tg, and use dust extraction for filled or fibre-reinforced versions.
Can E-44 be welded?
Thermoset — cannot be welded or remelted; joints are made by adhesive bonding with fresh resin or mechanical fastening.
Can E-44 be formed, bent or molded?
Mix with amine/polyamide (RT–80 °C) or anhydride (120–150 °C) hardener at the stoichiometric ratio; degas under vacuum for potting, control exotherm in thick sections (<25 mm per pour) and post-cure to develop full Tg.
E-44 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 |
|---|---|---|
| epoxide value (eq/100 g)GB/T 13657 spec window; grade name derives from 0.44 | 0.41 – 0.47 | 0.44 |
| volatilesGB/T 13657 limit, wt% | ≤ 2 | |
| inorganic chlorine≤0.001 mol/100 g, expressed approx. as wt% | ≤ 0.04 | |
| saponifiable (hydrolysable) chlorine≤0.02 mol/100 g, expressed approx. as wt% | ≤ 0.7 | |
| bisphenol-A diglycidyl ether (DGEBA) oliepoxy value 0.41–0.47 eq/100 g, EEW about 213–244 g/eq | balance |
What surface finishes work on E-44?
Sand and solvent-wipe before overcoating; cured epoxy takes paint and primers well but needs a PU or acrylic topcoat outdoors because it chalks under UV.
How much does E-44 cost?
E-44 is a standard-cost polymer ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
E-44 — frequently asked
What is E-44 used for?
E-44 is typically used for structural adhesives, protective coatings, composite matrix resin and tooling compounds. In short: chemical-resistant epoxy grade; adhesive and coating workhorse; higher crosslink density.
What is the tensile strength of E-44?
E-44 has a typical tensile strength of 62 MPa (8.99 ksi) — stronger than 70% of polymer grades. Strength varies by condition: see the 9 listed tempers.
Is E-44 easy to machine?
Reasonably — machinability is rated good (60/100, better than 51% of polymer grades). Cured castings drill/turn/mill with sharp carbide, low feed and good chip clearance; keep tools cool to avoid softening near Tg, and use dust extraction for filled or fibre-reinforced versions.
Can E-44 be welded?
Thermoset — cannot be welded or remelted; joints are made by adhesive bonding with fresh resin or mechanical fastening.
What surface finishes work on E-44?
Sand and solvent-wipe before overcoating; cured epoxy takes paint and primers well but needs a PU or acrylic topcoat outdoors because it chalks under UV.
Can E-44 be formed, bent or molded?
Mix with amine/polyamide (RT–80 °C) or anhydride (120–150 °C) hardener at the stoichiometric ratio; degas under vacuum for potting, control exotherm in thick sections (<25 mm per pour) and post-cure to develop full Tg.
What is the maximum service temperature of E-44?
E-44 is rated for continuous use to about 100°C (212 °F), and briefly to 140°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does E-44 cost?
E-44 is a standard-cost polymer ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASM Engineered Materials Handbook Vol. 3: Adhesives and Sealants / Vol. 2: Engineering Plastics — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.