NP500CR Glass Epoxy Laminate Sheet
NP500CR Glass Epoxy Laminate Sheet is a woven glass fabric composite with a specially formulated epoxy resin system engineered for excellent electrical characteristics and superior physical properties at cryogenic temperatures, with an operating temperature range of -270°C to 135°C. The material delivers a flexural strength of 75,000 / 65,000 psi (LW/CW), an Izod impact strength of 14.00 / 12.00 ft-lb/in (LW/CW), and very low thermal conductivity, and has been produced specifically for cryogenic applications. No NEMA grade is assigned to this material.
Key Properties
- Flexural Strength, Condition A LW / CW: 75,000 / 65,000 psi (ASTM D790)
- Flexural Modulus, Condition A LW / CW: 2,700 / 2,400 kpsi (ASTM D790)
- Tensile Strength, Condition A LW / CW: 45,000 / 38,000 psi (ASTM D638)
- Izod Impact Strength, Condition E-48/50 LW / CW (notched): 14.00 / 12.00 ft-lb/in (ASTM D256)
- Compressive Strength, Condition A Flatwise: 65,000 psi (ASTM D695)
- Operating Temperature Range: -270°C to 135°C
We want to help!
Enter your information and we'll get you in touch with our knowledgable staff. We know how important to the right product for your project.
Request a Consultation
- Specifications
- Applications
- General Info
- FAQs
Physical Properties
| Property | Value | Test Method |
| Specific Gravity | 1.80 | — |
| Rockwell Hardness | 100 M Scale | — |
| Moisture Absorption, Condition Dᵢ-24/23 | 0.10% | ASTM D570 |
| Flexural Strength, Condition A LW / CW | 75,000 / 65,000 psi | ASTM D790 |
| Flexural Modulus, Condition A LW / CW | 2,700 / 2,400 kpsi | ASTM D790 |
| Tensile Strength, Condition A LW / CW | 45,000 / 38,000 psi | ASTM D638 |
| Izod Impact Strength, Condition E-48/50 LW / CW (notched) | 14.00 / 12.00 ft-lb/in | ASTM D256 |
| Compressive Strength, Condition A Flatwise | 65,000 psi | ASTM D695 |
| Bond Strength, Condition A | 2,200 lb | ASTM D229 |
| Shear Strength, Condition A Perpendicular | 22,000 psi | ASTM D732 |
Thermal Properties
| Property | Value | Test Method |
| Operating Temperature Range | -270°C to 135°C | — |
| Temperature Index — Electrical / Mechanical | 130 / 140°C | UL Bulletin 746b |
| Coefficient of Thermal Expansion, X-axis / Y-axis | 10.0 / 13.0 (“/”/°C × 10⁻⁶) | IPC-TM 650-2.4.24 |
| Tg | 115°C | — |
| Thermal Endurance | TI 135 | — |
| Flammability Rating — UL 94 | HB | UL Bulletin 94 |
Electrical Properties
| Property | Value | Test Method |
| Dissipation Factor, Condition D₁-24/23 | 0.025 | ASTM D150 |
| Permittivity, Condition D₁-24/23 | 4.80 | ASTM D150 |
| Breakdown Voltage, Condition A | 60 kV | ASTM D149 |
| Breakdown Voltage, Condition D-48/50 | 50 kV | ASTM D149 |
| Electric Strength, Condition A | 670 V/mil | ASTM D149 |
| Electric Strength, Condition D-48/50 | 660 V/mil | ASTM D149 |
| Arc Resistance, Condition A | 100 sec | ASTM D495 |
| Comparative Tracking Index | 150 V | ASTM D3638 |
- Superconducting magnet insulation in MRI and research systems
- Cryostat structural insulation supports and spacers
- Liquid nitrogen and liquid helium system insulating components
- High-energy physics research equipment insulation
- Low-temperature structural insulation in cryogenic industrial systems
Common industries: Medical Equipment, High-Energy Physics Research, Aerospace, Cryogenic Industrial Systems, Defense.
NP500CR Glass Epoxy Laminate Sheet is a cryogenic-grade glass fabric epoxy laminate specifically engineered for applications operating at or near liquid nitrogen (-196°C) and liquid helium (-269°C) temperatures.
The specially formulated epoxy resin system retains superior mechanical properties — including a flexural strength of 75,000 / 65,000 psi (LW/CW) and Izod impact strength of 14.00 / 12.00 ft-lb/in (LW/CW, notched) — at cryogenic service conditions where standard epoxy laminates would become brittle and susceptible to fracture.
Very low thermal conductivity minimizes heat transfer into cryogenic systems, a critical design requirement for superconducting magnet insulation and cryostat structural components.
The material achieves a breakdown voltage of 60 kV (Condition A), electric strength of 670 V/mil (Condition A), arc resistance of 100 seconds, and a comparative tracking index of 150 V, supporting its use as an electrical insulator in cryogenic electrical systems. Temperature index is 130°C electrical / 140°C mechanical and thermal endurance is rated TI 135. Glass transition temperature is 115°C. Flammability is rated HB per UL 94.
Note: this formulation is sometimes referred to in industry as G10CR; however, NIST does not maintain a G10CR process specification and compliance with a NIST process specification cannot be claimed.
What differentiates NP500CR Glass Epoxy Laminate Sheet from standard G-10 (NP500A)?
NP500CR uses a specially formulated cryogenic epoxy resin system engineered to maintain mechanical integrity at temperatures as low as -270°C, where standard G-10 laminates become brittle and susceptible to fracture. NP500CR also carries a higher flexural strength (75,000 / 65,000 psi LW/CW vs. 66,000 / 60,000 psi for NP500A) and higher Izod impact strength (14.00 / 12.00 ft-lb/in vs. 9.50 / 7.50 ft-lb/in). NP500CR carries no NEMA grade designation; NP500A is NEMA Grade G-10.
: Why does low thermal conductivity matter for cryogenic laminate applications?
In cryogenic systems, thermal conduction through structural and insulating components directly drives heat leak into the cold volume — each milliwatt of heat influx requires cryogenic refrigeration capacity to counteract, adding operating cost and reducing system efficiency. Very low thermal conductivity in the laminate minimizes parasitic heat transfer through supports, spacers, and insulating panels, which is a primary design criterion for superconducting magnets, cryostats, and liquid helium systems.
What is the operating temperature range for NP500CR Glass Epoxy Laminate Sheet?
The operating temperature range is -270°C to 135°C, as listed on the Technical Datasheet.
Is NP500CR Glass Epoxy Laminate Sheet the same as G10CR?
NP500CR is sometimes referred to in industry as G10CR. However, as noted on the manufacturer's TDS, NIST does not maintain a G10CR process specification, and compliance with a NIST process specification cannot be claimed for this material. No compliance standards are specified on the manufacturer's TDS for NP500CR.
How should NP500CR Glass Epoxy Laminate Sheet be specified?
Specify grade (NP500CR Glass Epoxy Laminate Sheet), thickness, dimensional tolerances, and finished format. Note that no NEMA grade or NIST specification is applicable to this material per the manufacturer's TDS.
