NP310 Canvas Phenolic Laminate Sheet
NP310 Canvas Phenolic Laminate Sheet is a canvas machining grade composite constructed from woven canvas fabric combined with a phenolic resin system, certifiable to ANSI/NEMA IM 60000-2021 Grade C, MIL-I-24768/16, ASTM D709 Type II Grade C, and IEC-60893-4-PF CC 201. The material is designed for structural and mechanical applications and delivers better impact strength than phenolic paper grades, with an Izod impact strength of 3.10 / 2.70 ft-lb/in (LW/CW) — the highest in the canvas and linen phenolic laminate line. UL Listed for Postville, IA manufactured material.
Key Properties
- Flexural Strength, Condition A LW / CW: 18,000 / 17,000 psi (124.1) / (117.2) MPa (ASTM D790)
- Flexural Modulus, Condition A LW / CW: 1,600 / 1,500 kpsi (11.0) / (10.3) GPa (ASTM D790)
- Tensile Strength, Condition A LW / CW: 12,000 / 9,700 psi (82.7) / (66.9) MPa (ASTM D638)
- Izod Impact Strength, Condition E-48/50 LW / CW: 3.10 / 2.70 ft-lb/in (1.65) / (1.44) J/cm (ASTM D256)
- Compressive Strength, Condition A Flatwise: 34,000 psi (234.4) MPa (ASTM D695)
- Temperature Index — Electrical / Mechanical: 115 / 125°C (UL Bulletin 746b)
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- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Specific Gravity | 1.37 | ASTM D792 |
| Rockwell Hardness (0.250″ Build-up) | 100 M Scale | ASTM D785 |
| Moisture Absorption, Condition D₁-24/23 | 3.50% | ASTM D570 |
| Flexural Strength, Condition A LW / CW | 18,000 / 17,000 psi (124.1) / (117.2) MPa | ASTM D790 |
| Flexural Modulus, Condition A LW / CW | 1,600 / 1,500 kpsi (11.0) / (10.3) GPa | ASTM D790 |
| Tensile Strength, Condition A LW / CW | 12,000 / 9,700 psi (82.7) / (66.9) MPa | ASTM D638 |
| Izod Impact Strength, Condition E-48/50 LW / CW | 3.10 / 2.70 ft-lb/in (1.65) / (1.44) J/cm | ASTM D256 |
| Compressive Strength, Condition A Flatwise | 34,000 psi (234.4) MPa | ASTM D695 |
| Bonding Strength, Condition A | 2,500 lb (1,134.0) kg | ASTM D229 |
| Bonding Strength, Condition D-48/50 | 2,300 lb (1,043.3) kg | ASTM D229 |
| Shear Strength, Condition A Perpendicular | 14,000 psi (96.5) MPa | ASTM D732 |
Thermal Properties
| Property | Value | Test Method |
| Temperature Index — Electrical / Mechanical | 115 / 125°C | UL Bulletin 746b |
| Coefficient of Thermal Expansion, X-axis / Y-axis | 20.0 / 22.0 (“/”/°C × 10⁻⁶) | IPC-TM 650-2.4.24 |
| Flammability Rating, Condition A | HB | UL Bulletin 94 |
Electrical Properties
| Property | Value | Test Method |
| Breakdown Voltage, Condition A | 20 kVolts | ASTM D149 |
| Breakdown Voltage, Condition D-48/50 | 5 kVolts | ASTM D149 |
| Electric Strength, Condition A | 400 Volts/mil (157.5) kV/cm | ASTM D149 |
| Electric Strength, Condition D-48/50 | 150 Volts/mil (59.1) kV/cm | ASTM D149 |
| Arc Resistance, Condition A | 15 sec | ASTM D495 |
| Comparative Tracking Index | 155 V | ASTM D3638 |
Compliance
- ANSI/NEMA IM 60000-2021 Grade C — Certifiable
- MIL-I-24768/16 — Certifiable
- ASTM D709 Type II Grade C — Certifiable
- IEC-60893-4-PF CC 201 — Certifiable
- UL Listed (Postville, IA manufactured material only)
- Structural and mechanical phenolic components requiring NEMA Grade C compliance
- Gears, pulleys, and mechanical drive components subject to dynamic loading
- Electrical insulation panels and structural supports
- Precision-machined structural phenolic parts requiring impact resistance
- Military and industrial applications requiring MIL-I-24768/16 compliance
Common industries: Electrical Equipment Manufacturing, Defense, Industrial Manufacturing, Mechanical Power Transmission, General Engineering.
NP310 Canvas Phenolic Laminate Sheet is the standard canvas machining grade in the Norplex-Micarta phenolic laminate line — a woven canvas fabric composite impregnated with a phenolic resin system and certifiable to NEMA Grade C, MIL-I-24768/16, and ASTM D709 Type II Grade C.
Its primary performance advantage over phenolic paper grades is impact strength: at 3.10 / 2.70 ft-lb/in (LW/CW), NP310 delivers the highest Izod impact strength in the canvas and linen phenolic laminate family, making it the appropriate selection for structural and mechanical components that must withstand dynamic or shock loading in service.
Bonding strength is 2,500 lb (Condition A) and 2,300 lb (Condition D-48/50), with a compressive strength of 34,000 psi flatwise.
The canvas construction and heavier fabric weight make NP310 better suited for larger structural components than finer weave grades such as NP342 and NP320, which are preferred for small intricate shapes and fine surface finish. Moisture absorption is 3.50%, the highest in the family — applications in humid environments should consider NP320E (NEMA Grade LE). The temperature index is 115°C electrical / 125°C mechanical and flammability is rated HB. The UL Listing applies to Postville, IA manufactured material only.
Certifiable to ANSI/NEMA IM 60000-2021 Grade C, MIL-I-24768/16, ASTM D709 Type II Grade C, and IEC-60893-4-PF CC 201. UL Listed (Postville, IA manufactured material).
What differentiates NP310 Canvas Phenolic Laminate Sheet from NP342 and NP320?
NP310 uses a heavier canvas weave construction that delivers the highest Izod impact strength in the phenolic laminate line (3.10 / 2.70 ft-lb/in LW/CW vs. 1.60 / 1.40 for NP342 and 1.70 / 1.35 for NP320). It is the appropriate choice for larger structural components and applications where impact resistance is the primary driver. NP342 offers better machinability than NP310 at lower cost than NP320; NP320 is the fine weave linen grade for smaller intricate shapes requiring finer surface finish. NP310 is the only grade in this family that is UL Listed (Postville, IA only).
Why does impact strength matter when selecting a phenolic laminate for mechanical applications?
Izod impact strength measures resistance to sudden fracture under dynamic loading — the primary failure mode in mechanical components such as gears, cams, and structural supports that experience shock loads, vibration, or intermittent high-force contact. Phenolic paper grades are more brittle and susceptible to fracture in these conditions. NP310's canvas reinforcement absorbs impact energy more effectively, making it the phenolic laminate of choice for mechanical service where shock loads are a design consideration.
What is the temperature index for NP310 Canvas Phenolic Laminate Sheet?
The temperature index is 115°C electrical / 125°C mechanical, as listed on the Technical Datasheet.
Is NP310 Canvas Phenolic Laminate Sheet suitable for military and regulated environments?
Yes. NP310 is certifiable to ANSI/NEMA IM 60000-2021 Grade C, MIL-I-24768/16, ASTM D709 Type II Grade C, and IEC-60893-4-PF CC 201, and is UL Listed for Postville, IA manufactured material. Note that the flammability rating is HB — applications requiring V-0 should specify a glass epoxy grade such as NP510A (FR-4).
How should NP310 Canvas Phenolic Laminate Sheet be specified?
Specify grade (NP310 Canvas Phenolic Laminate Sheet), thickness, compliance requirements (NEMA Grade C, MIL-I-24768/16, or ASTM D709 as applicable), dimensional tolerances, and finished format. If UL Listing is required, specify Postville, IA manufactured material.
