The YSHIELD® A300 HEMP is a high-performance electromagnetic shielding fleece engineered for applications requiring exceptional RF shielding and protection against High Altitude Electromagnetic Pulse (HEMP). Designed to support shielding systems compliant with MIL-STD-188-125, it is an ideal solution for critical infrastructure, government facilities, data centers, laboratories, and secure communications environments.

The material consists of a durable fleece laminated on both sides with thick micro-needled aluminum foil, creating redundant shielding layers while maintaining excellent flexibility and durability. Unlike conventional aluminum laminates, the micro-needled construction creates approximately 4 million microscopic perforations per square meter, allowing outstanding water vapor permeability without compromising its exceptional 123 dB shielding attenuation.

Designed for professional contractors and large-scale shielding projects, the A300 HEMP is suitable for installation within walls, ceilings, and floor assemblies. For installations requiring compliance with MIL-STD-188-125, the manufacturer specifies a two-layer installation. For projects requiring only high-frequency electromagnetic shielding, a single layer is generally sufficient due to the product’s redundant shielding construction.

• MIL-STD-188-125 Compliant – Designed for HEMP and EMP shielding systems protecting critical infrastructure.
• 123 dB Shielding Performance – Exceptional attenuation of high-frequency electromagnetic fields.
• Double-Laminated Construction – Stable fleece laminated on both sides with thick micro-needled aluminum foil.
• Highly Water Vapor Permeable – Approximately 4 million micro-perforations per square meter allow moisture vapor to pass while maintaining shielding performance.
• Professional Grade Material – Designed for demanding commercial, industrial, military, and government applications.
• Large Area Coverage – Ideal for shielding walls, ceilings, and flooring systems.
• Indoor Installation – Engineered for interior building assemblies.
• Manufactured in Germany – Produced in-house by YSHIELD® for consistent quality and performance.

• Product Type: Electromagnetic Shielding Fleece
• Construction: Stable fleece laminated on both sides with thick micro-needled aluminum foil
• Military Standard: MIL-STD-188-125
• Shielding Attenuation: 123 dB
• Roll Width: 90 cm (35.4 in)
• Roll Length: 50 m (164 ft)
• Coverage: Approximately 45 m² (484 sq ft) per roll
• Thickness: 0.4 mm (0.016 in)
• Surface Weight: 300 g/m²
• Water Vapor Permeability (sd): 0.024 m
• Color: Silver / Silver
• Tear Resistance: Longitudinal: 6800 N/m
• Transverse: 4400 N/m
• Corrosion Resistance: Equivalent to aluminum
• Materials: Aluminum, cellulose (FSC®, EUTR), OEKO-TEX® certified polyester fibers, OEKO-TEX® certified adhesive powder
• Country of Origin: Germany
• Manufacturer: YSHIELD®

• Critical Infrastructure – Shielding systems designed to protect essential facilities from electromagnetic pulse (EMP/HEMP) events.
• Data Centers & Server Rooms – Provides high-performance electromagnetic shielding for mission-critical equipment and communications infrastructure.
• Government & Defense – Suitable for TEMPEST rooms, SCIF environments, military facilities, and secure communications installations.
• Laboratories & Research Facilities – Ideal for EMC testing laboratories, research centers, and other specialized shielding applications.
• Commercial & Industrial Buildings – Designed for large-area shielding of walls, ceilings, and flooring systems in commercial and industrial environments.

• MIL-STD-188-125 Compliance: Install two layers to meet the requirements of MIL-STD-188-125.
• Overlap: Install adjacent sheets with a 5 cm (2 in) overlap. Seal all overlaps using YSHIELD® HNX50 or HNX100 Shielding Tape to maintain shielding continuity.
• Surface Preparation: Absorbent or chalky substrates should be pretreated with YSHIELD® GK5 Primer.
• Adhesive: Standard cellulose wallpaper adhesives will not bond to aluminum. Use YSHIELD® PSA Pressure Sensitive Adhesive for proper adhesion.
• Compatible Materials: Materials in direct contact with the aluminum surface should maintain a neutral pH between 4 and 9.
• Grounding: The conductive surface must be integrated into the building’s Functional Equipotential Bonding (FEB) system using appropriate grounding accessories.
• Multi-Layer Installation: Stagger seams between layers to optimize shielding performance.

A300 HEMP – Technical Data Sheet

A300 HEMP – Expert Report

A300 HEMP – Test Report