3240
3240 is an epoxy resin / woven glass-cloth laminate, functionally equivalent to ASTM D709 Grade G-10, supplied as sheet, rod and tube.
Reference datasheet — 3240 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.
3240 grades and fills
3240 is supplied in 4 conditions, soft to hard.
Compare all 4 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
ESD / anti-static black epoxy glass laminate | Choose for SMT pallets, ICT/test fixtures and semiconductor handling where static dissipation is required. | 275 | 1.7 | 105 HRM | |
flame-retardant epoxy glass cloth laminate (UL 94 V-0) | Choose when UL 94 V-0 / self-extinguishing behaviour is mandatory (electronics, switchgear, PCB substrate). | 290 | |||
flame-retardant high-temperature epoxy glass laminate (V-0, Class F/H) | Use when both V-0 flammability and 155–180 °C service are required. | 310 | 1.7 | 110 HRM | |
Cold rolled | Specify for LN2/LHe and superconducting-magnet structures where low-temperature strength and controlled resin content matter. | 415 | 2 | 110 HRM |
Supply forms, finishes and certifications
Ways 3240 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
G11 | G-11 / 3240 high-temperature | Coating |
STDDefault | 3240 standard | Standard supply |
What is 3240?
3240 is an epoxy resin / woven glass-cloth laminate, functionally equivalent to ASTM D709 Grade G-10, supplied as sheet, rod and tube. It is used for structural insulation and machined mechanical parts where strength and dielectric performance are both required; tensile strength is 300 MPa with a maximum service temperature of 130 °C. Variants on file cover FR-4, G11/FR-5, ESD and copper-clad stock. Machinability is low at 45 — glass cloth is abrasive on tooling — and the cured sheet cannot be formed, so parts are cut from stock. 3240 has a density of 1.9 g/cm³ (0.0686 lb/in³), heavier than 72% of composite grades. Its glass-transition temperature is 125°C (257 °F). 3240 has a tensile strength of 300 MPa (43.5 ksi), stronger than 53% of composite grades. Elongation at break is 1.8% and the elastic modulus is 21 GPa (3.05 Msi).
What is 3240 used for?
- structural insulation boards
- mechanical/electrical spacers
- PCB backing plates
- test fixtures
3240 properties
Typical room-temperature values; bars are the position among composite grades.
Physical4
3240 has a density of 1.9 g/cm³ (0.0686 lb/in³), heavier than 72% of composite grades. Its glass-transition temperature is 125°C (257 °F).
Mechanical12
3240 has a tensile strength of 300 MPa (43.5 ksi), stronger than 53% of composite grades. Elongation at break is 1.8% and the elastic modulus is 21 GPa (3.05 Msi).
Thermal8
3240 is rated for continuous service to 130°C (266 °F). It conducts heat at 0.35 W/m·K (0.202 BTU/hr·ft·°F), better than 50% of composite grades. Thermal expansion is 14 µm/m·K (7.78 µin/in·°F).
Electrical7
3240 is an electrical insulator with a dielectric strength of 18 kV/mm (457.2 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 65% of composite grades. UV resistance is fair.
Sustainability4
Producing a kilogram of 3240 takes about 110 MJ of energy and emits 6.5 kg of CO₂ — less than 60% of composite grades. Typical recycled content is 0%.
Manufacturability2
3240's machinability is fair (45/100, better than 63% of composite 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 composite family
Yield strength against density for every composite grade FabDigit runs. 3240 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with 3240
Is 3240 easy to machine?
Machine with sharp carbide or PCD tooling, high speed / moderate feed, no coolant needed but strong dust extraction is mandatory (respirable glass dust); back up drilled holes to avoid delamination and chip-out.
Can 3240 be welded?
Not weldable — thermoset laminate; join by bolting, riveting or epoxy/acrylic structural adhesive after abrading and solvent-cleaning the surface.
Can 3240 be formed, bent or molded?
Supplied as fully cured flat sheet, rod or tube; no post-forming possible — parts are cut, routed, punched (thin sheet, warm) or waterjet from stock.
3240 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 |
|---|---|---|
| E-glass clothwoven E-glass reinforcement, 7628/2116-type styles | 50 – 65 | 58 |
| bromine (FR grades only)≈15–20 wt% brominated epoxy gives ~2–4% Br in FR-4/FR-5 | 0 – 4 | 0 |
| pigment / filleryellow, water-green or black colouring; carbon for ESD grades | 0 – 2 | 0.5 |
| epoxy-phenolic resin ( + )DGEBA/phenolic novolac cured system; FR-4 uses brominated epoxy | ≥ 35 (balance) |
What surface finishes work on 3240?
Edges deburr easily; surfaces can be sanded and coated with epoxy or polyurethane paint for UV protection; copper-clad versions accept standard PCB etching and plating processes.
How much does 3240 cost?
3240 is a premium-cost composite ($$$), cheaper than about 51% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
3240 — frequently asked
What is 3240 used for?
3240 is typically used for structural insulation boards, mechanical/electrical spacers, PCB backing plates and test fixtures. In short: G-10 equivalent epoxy-glass; strongest laminate in family; structural plus electrical grade.
What is the tensile strength of 3240?
3240 has a typical tensile strength of 300 MPa (43.5 ksi) — stronger than 53% of composite grades. Strength varies by condition: see the 4 listed tempers.
Is 3240 easy to machine?
Reasonably — machinability is rated fair (45/100, better than 63% of composite grades). Machine with sharp carbide or PCD tooling, high speed / moderate feed, no coolant needed but strong dust extraction is mandatory (respirable glass dust); back up drilled holes to avoid delamination and chip-out.
Can 3240 be welded?
Not weldable — thermoset laminate; join by bolting, riveting or epoxy/acrylic structural adhesive after abrading and solvent-cleaning the surface.
What surface finishes work on 3240?
Edges deburr easily; surfaces can be sanded and coated with epoxy or polyurethane paint for UV protection; copper-clad versions accept standard PCB etching and plating processes.
Can 3240 be formed, bent or molded?
Supplied as fully cured flat sheet, rod or tube; no post-forming possible — parts are cut, routed, punched (thin sheet, warm) or waterjet from stock.
What is the maximum service temperature of 3240?
3240 is rated for continuous use to about 130°C (266 °F), and briefly to 180°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does 3240 cost?
3240 is a premium-cost composite ($$$), cheaper than about 51% 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
- GB/T 1303.4 (Epoxy phenolic glass cloth laminated sheet) (2009)
- ASTM D709 Standard Specification for Laminated Thermosetting Materials (Grade G-10, G-11, FR-4, FR-5) — ASTM International (2017)
- NEMA LI 1 Industrial Laminating Thermosetting Products — NEMA (1998)
- Engineered Materials Handbook Vol. 2: Engineering Plastics / Composites — ASM International (1988)
- G-10/FR-4 glass-epoxy laminate technical data — Professional Plastics / (2023)
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.