NP630 Paper Phenolic Laminate Sheet
NP630 Paper Phenolic Laminate Sheet is a fine machining grade paper-phenolic laminate with excellent electrical properties and moisture resistance, low cold flow, and good dimensional stability. NP630 meets ASTM D709 Type I Grade XXX and will meet ANSI/NEMA IM 60000-2021 Grade XXX, MIL-I-24768/10 PBE, and NEMA LI 1-1998 Grade XXX specifications with exception to dissipation factor and dielectric breakdown requirements. The material delivers a compressive strength of 45,000 psi flatwise — the highest in the paper phenolic laminate line — along with a comparative tracking index of 200 V and arc resistance of 130 seconds. Not UL Listed.
Key Properties
- Flexural Strength, Condition A LW / CW: 22,000 / 18,000 psi (151.7) / (124.1) MPa (ASTM D790)
- Tensile Strength, Condition A LW / CW: 14,000 / 11,000 psi (96.5) / (75.8) MPa (ASTM D638)
- Compressive Strength, Condition A Flatwise: 45,000 psi (310.3) MPa (ASTM D695)
- Izod Impact Strength, Condition A LW / CW: 1.00 / 0.85 ft-lb/in (0.53) / (0.45) J/cm (ASTM D256)
- Arc Resistance, Condition A: 130 sec (ASTM D495)
- Comparative Tracking Index: 200 V (ASTM D3638)
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Physical Properties
| Property | Value | Test Method |
| Specific Gravity | 1.36 | ASTM D792 |
| Rockwell Hardness (0.250″ Build-up) | 96 M Scale | ASTM D785 |
| Moisture Absorption, Condition D₁-24/23 | 1.60% | ASTM D570 |
| Flexural Strength, Condition A LW / CW | 22,000 / 18,000 psi (151.7) / (124.1) MPa | ASTM D790 |
| Flexural Modulus, Condition A LW / CW | 1,400 / 1,200 kpsi (9.7) / (8.3) GPa | ASTM D790 |
| Flexural Modulus, Condition E-1/150: T-150 LW / CW | 13,000 / 12,000 kpsi (89.6) / (82.7) GPa | ASTM D790 |
| Tensile Strength, Condition A LW / CW | 14,000 / 11,000 psi (96.5) / (75.8) MPa | ASTM D638 |
| Izod Impact Strength, Condition A LW / CW | 1.00 / 0.85 ft-lb/in (0.53) / (0.45) J/cm | ASTM D256 |
| Izod Impact Strength, Condition E-48/50 LW / CW | 0.90 / 0.80 ft-lb/in (0.48) / (0.43) J/cm | ASTM D256 |
| Compressive Strength, Condition A Flatwise | 45,000 psi (310.3) MPa | ASTM D695 |
| Bonding Strength, Condition A | 1,100 lb (499.0) kg | ASTM D229 |
| Shear Strength, Condition A Perpendicular | 12,800 psi (88.3) MPa | ASTM D732 |
Thermal Properties
| Property | Value | Test Method |
| Temperature Index — Electrical / Mechanical | 130 / 130°C | UL Bulletin 746b |
| Coefficient of Thermal Expansion, X-axis / Y-axis | 15.0 / 19.0 (“/”/°C × 10⁻⁶) | IPC-TM 650-2.4.24 |
| Flammability Rating, Condition A | HB | UL Bulletin 94 |
Electrical Properties
| Property | Value | Test Method |
| Dissipation Factor @ 1 MHz, Condition D-24/23 | 0.080 | ASTM D150 |
| Relative Permittivity @ 1 MHz, Condition D-24/23 | 6.10 | ASTM D150 |
| Breakdown Voltage, Condition A | 33 kVolts | ASTM D149 |
| Breakdown Voltage, Condition D-48/50 | 5 kVolts | ASTM D149 |
| Electric Strength, Condition A | 310 Volts/mil (122.0) kV/cm | ASTM D149 |
| Electric Strength, Condition D-48/50 | 85 Volts/mil (33.5) kV/cm | ASTM D149 |
| Arc Resistance, Condition A | 130 sec | ASTM D495 |
| Comparative Tracking Index | 200 V | ASTM D3638 |
Compliance
- ASTM D709 Type I Grade XXX — Compliant
- ANSI/NEMA IM 60000-2021 Grade XXX — Compliant with exception to dissipation factor and dielectric breakdown requirements
- MIL-I-24768/10 PBE — Compliant with exception to dissipation factor and dielectric breakdown requirements
- NEMA LI 1-1998 Grade XXX — Compliant with exception to dissipation factor and dielectric breakdown requirements
- Precision fine-machined electrical insulation components requiring best-in-class electrical properties in the paper phenolic family
- Dimensional stability-critical insulation components requiring low cold flow
- Switchgear and electrical equipment insulation requiring high arc resistance and CTI
- Structural insulation requiring highest compressive strength in the paper phenolic line
- Military electrical insulation applications referencing MIL-I-24768/10 PBE
Common industries: Electrical Equipment Manufacturing, Defense, Industrial Manufacturing, Switchgear, General Engineering.
NP630 Paper Phenolic Laminate Sheet is the finest machining grade in the paper phenolic laminate line — a high-pressure paper-phenolic composite engineered for applications requiring excellent electrical properties, moisture resistance, dimensional stability, and low cold flow.
The low cold flow characteristic means the material resists permanent deformation under sustained compressive load at temperature — a critical property for precision-machined insulation components that must maintain dimensional accuracy through assembly clamping, thermal cycling, and long-term service.
Compressive strength reaches 45,000 psi flatwise, the highest in the paper phenolic family, and the comparative tracking index of 200 V and arc resistance of 130 seconds represent the best electrical performance in the line.
Flexural modulus is listed at both room temperature (1,400 / 1,200 kpsi LW/CW) and elevated temperature (Condition E-1/150: T-150, 13,000 / 12,000 kpsi LW/CW), with Izod impact strength provided at both Condition A (1.00 / 0.85 ft-lb/in LW/CW) and Condition E-48/50 (0.90 / 0.80 ft-lb/in LW/CW). Moisture absorption is 1.60% — the lowest in the paper phenolic family. The temperature index is 130°C electrical / 130°C mechanical and flammability is rated HB. NP630 is not UL Listed.
NP630 meets ASTM D709 Type I Grade XXX. NP630 will meet ANSI/NEMA IM 60000-2021 Grade XXX, MIL-I-24768/10 PBE, and NEMA LI 1-1998 Grade XXX specifications with exception to dissipation factor and dielectric breakdown requirements.
What differentiates NP630 Paper Phenolic Laminate Sheet from NP629 (Grade XX) and NP610 (Grade X)?
NP630 (Grade XXX) is the fine machining, electrically optimized grade in the paper phenolic line, delivering the highest compressive strength (45,000 psi), lowest moisture absorption (1.60%), highest arc resistance (130 sec), and highest comparative tracking index (200 V) of the three grades. NP629 (Grade XX) offers moderate electrical performance suitable for combined mechanical and electrical applications at lower cost. NP610 (Grade X) delivers the highest flexural and tensile strength and hot-punch capability for primarily mechanical applications where electrical performance is secondary.
Why does low cold flow matter when selecting a paper phenolic laminate for precision insulation applications?
Cold flow is the tendency of a material to deform permanently under sustained compressive load at elevated temperature — without reaching its formal yield strength. In precision-machined insulation components subject to bolt-load clamping, thermal cycling, or long-term compressive stress, a material with significant cold flow will change dimensions over time, loosening joints, degrading sealing interfaces, and altering the electrical geometry of insulation assemblies. NP630's low cold flow and good dimensional stability make it the appropriate selection for applications where sustained dimensional accuracy under load is a design requirement.
What is the temperature index for NP630 Paper Phenolic Laminate Sheet?
The temperature index is 130°C electrical / 130°C mechanical, as listed on the Technical Datasheet.
Does NP630 Paper Phenolic Laminate Sheet fully comply with NEMA Grade XXX specifications?
Partially. NP630 meets ASTM D709 Type I Grade XXX without exception. For ANSI/NEMA IM 60000-2021 Grade XXX, MIL-I-24768/10 PBE, and NEMA LI 1-1998 Grade XXX, NP630 meets the specifications with exception to dissipation factor and dielectric breakdown requirements, as stated on the manufacturer's TDS. Applications requiring full compliance with all Grade XXX dissipation factor and dielectric breakdown limits should consult with H-O Products before specifying.
How should NP630 Paper Phenolic Laminate Sheet be specified?
Specify grade (NP630 Paper Phenolic Laminate Sheet), thickness, compliance requirements (ASTM D709 Type I Grade XXX; or NEMA Grade XXX / MIL-I-24768/10 PBE with noted exceptions), dimensional tolerances, and finished format.
