NP500A Glass Epoxy Laminate Sheet
NP500A Glass Epoxy Laminate Sheet is a woven glass fabric composite combined with an easy-machining, non-brominated epoxy resin system, complying with ANSI/NEMA IM 60000-2021 Grade G-10, MIL-I-24768/2 GEE, ASTM D709 Type IV Grade G-10, and IEC 60893-2-EPGC 201. The material delivers a flexural strength of 66,000 / 60,000 psi (LW/CW) and a flexural modulus of 3,400 / 3,300 kpsi (LW/CW) across a temperature index of 130°C electrical / 140°C mechanical. The non-brominated resin system provides improved machinability and cost-effectiveness compared to brominated FR-grade laminates, making it well suited for low-temperature thermal insulation, structural applications, and mechanical and electrical applications at low to moderately high temperatures.
Key Properties
- Flexural Strength, Condition A LW / CW: 66,000 / 60,000 psi (455.1) / (413.7) MPa (ASTM D790)
- Flexural Modulus, Condition A LW / CW: 3,400 / 3,300 kpsi (23.4) / (22.8) GPa (ASTM D790)
- Tensile Strength, Condition A LW / CW: 43,000 / 39,000 psi (296.5) / (268.9) MPa (ASTM D638)
- Izod Impact Strength, Condition E-48/50 LW / CW: 9.50 / 7.50 ft-lb/in (5.07) / (4.00) J/cm (ASTM D256)
- Compressive Strength, Condition A Flatwise: 62,800 psi (433.0) MPa (ASTM D695)
- Tg by DMA: 120°C
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- Specifications
- Applications
- General Info
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Physical Properties
| Property | Value | Test Method |
| Specific Gravity | 1.77 | ASTM D792 |
| Rockwell Hardness (0.250″ Build-up) | 99 M Scale | ASTM D785 |
| Moisture Absorption, Condition D₁-24/23 | 0.22% | ASTM D570 |
| Flexural Strength, Condition A LW / CW | 66,000 / 60,000 psi (455.1) / (413.7) MPa | ASTM D790 |
| Flexural Modulus, Condition A LW / CW | 3,400 / 3,300 kpsi (23.4) / (22.8) GPa | ASTM D790 |
| Tensile Strength, Condition A LW / CW | 43,000 / 39,000 psi (296.5) / (268.9) MPa | ASTM D638 |
| Izod Impact Strength, Condition E-48/50 LW / CW | 9.50 / 7.50 ft-lb/in (5.07) / (4.00) J/cm | ASTM D256 |
| Compressive Strength, Condition A Flatwise | 62,800 psi (433.0) MPa | ASTM D695 |
| Bonding Strength, Condition A | 2,500 lb (1,134.0) kg | ASTM D229 |
| Shear Strength, Condition A Perpendicular | 19,000 psi (131.0) MPa | ASTM D732 |
Thermal Properties
| Property | Value | Test Method |
| Temperature Index — Electrical / Mechanical | 130 / 140°C | UL Bulletin 746b |
| Coefficient of Thermal Expansion, X-axis / Y-axis | 12.1 / 9.6 (“/”/°C × 10⁻⁶) | IPC-TM 650-2.4.24 |
| Tg by DMA | 120°C | — |
| Flammability Rating, Condition A | HB | UL Bulletin 94 |
Electrical Properties
| Property | Value | Test Method |
| Breakdown Voltage, Condition A | 48 kVolts | ASTM D149 |
| Breakdown Voltage, Condition D-48/50 | 49 kVolts | ASTM D149 |
| Electric Strength, Condition A | 690 Volts/mil (271.7) kV/cm | ASTM D149 |
| Electric Strength, Condition D-48/50 | 690 Volts/mil (271.7) kV/cm | ASTM D149 |
Compliance
- ANSI/NEMA IM 60000-2021 Grade G-10 — Compliant
- MIL-I-24768/2 GEE — Compliant
- ASTM D709 Type IV Grade G-10 — Compliant
- IEC 60893-2-EPGC 201 — Compliant
- Low-temperature thermal insulation structural panels and components
- Busbar supports and PCB carrier structures
- Precision-machined electrical insulating parts requiring NEMA G-10 compliance
- Structural insulation components in electrical switchgear and enclosures
- General mechanical and electrical insulation at low to moderately high temperatures
Common industries: Electrical Equipment Manufacturing, Power Distribution, Defense, Industrial Manufacturing, Electronics.
NP500A Glass Epoxy Laminate Sheet is the NEMA Grade G-10 entry in the Norplex-Micarta glass epoxy laminate line — a general-purpose structural and electrical insulation laminate constructed from woven glass fabric impregnated with a non-brominated epoxy resin system. The non-brominated resin formulation makes this material easier to machine and more cost-effective in many applications than brominated FR-grade alternatives, while delivering solid mechanical performance including a compressive strength of 62,800 psi and a bonding strength of 2,500 lb.
The material operates with a temperature index of 130°C electrical / 140°C mechanical and a glass transition temperature of 120°C, suitable for low to moderately high temperature service. Breakdown voltage reaches 48 kV (Condition A) and electric strength reaches 690 Volts/mil (Condition A), supporting general electrical insulation applications. Moisture absorption is 0.22% and Rockwell hardness is 99 M Scale. Flammability is rated HB per UL Bulletin 94.
Compliant with ANSI/NEMA IM 60000-2021 Grade G-10, MIL-I-24768/2 GEE, ASTM D709 Type IV Grade G-10, and IEC 60893-2-EPGC 201.
What differentiates NP500A Glass Epoxy Laminate Sheet from NP510A (FR-4)?
NP500A uses a non-brominated epoxy resin system and is classified as NEMA Grade G-10, making it easier to machine and more cost-effective than NP510A (FR-4), which uses a brominated epoxy and achieves a UL 94 V-0 flame rating. NP500A carries a UL 94 HB flammability rating and is not UL Listed — making it the appropriate choice where flame retardancy is not required and machinability or cost are the primary drivers.
Why does flexural modulus matter when selecting a glass epoxy laminate?
Flexural modulus determines how much a laminate deflects under load — a higher modulus means greater stiffness and less bending for a given cross-section. In structural insulation applications such as busbar supports and mounting panels, adequate flexural modulus prevents mechanical creep and maintains dimensional integrity under sustained electrical and mechanical loading. NP500A delivers 3,400 / 3,300 kpsi (LW/CW), providing solid structural performance for general-purpose insulation applications.
What is the temperature index for NP500A Glass Epoxy Laminate Sheet?
The temperature index is 130°C electrical / 140°C mechanical, as listed on the Technical Datasheet.
Is NP500A Glass Epoxy Laminate Sheet suitable for military or specification-controlled environments?
Yes. NP500A complies with MIL-I-24768/2 GEE, ANSI/NEMA IM 60000-2021 Grade G-10, ASTM D709 Type IV Grade G-10, and IEC 60893-2-EPGC 201. Note that NP500A is not UL Listed and carries a UL 94 HB flammability rating — applications requiring UL Listing or a V-0 flame rating should specify NP510A (FR-4) instead.
How should NP500A Glass Epoxy Laminate Sheet be specified?
Specify grade (NP500A Glass Epoxy Laminate Sheet), thickness, compliance requirements (NEMA G-10, MIL-I-24768/2, or ASTM D709 as applicable), dimensional tolerances, and finished format.
