Rigorous Testing For Comprehensive HEMP & IEMI Protection

Electromagnetic Shielding

Omni-Threat Structures is committed to rigorous testing and has a complete set of shielding testing equipment and expert personnel to conduct tests and interpret the results. OTS also conducts shielding effectiveness testing for its R&D projects, and has confirmed 3rd party testing of its initial R&D products. Shielding concrete strength and materials testing is part of the company’s routine testing procedures.

As part of our on-going R&D and continuing drive for lower cost structures, OTS constructed a prototype building, OTS Integrated Shielded Test Structure, to validate the next generation of OTS EMSS materials and methods. We provided further proof that the shielded envelope can be 10 inches instead of the previous 12 inches.

ATSI (Advanced Testing Services Inc), with 28 years of military and civilian testing experience, conducted the testing. Test results establishing Mil STD 188-125 shielding compliance are below:

1.5 Executive Summary

MIL-STD-188-125-1 Appendix A acceptance testing was performed on one RF shielded enclosure, the OTS Integrated Shielded Test Structure known as OTS ISTS. This testing took place at Omni-Threat Structures located in Lakeland, Florida. Testing took place on December 4, 2019. with no deviations of MIL-STD-188-125-1 Appendix A. The OTS ISTS under test successfully satisfied all pass/fail criteria specified.

2.0 OTS Integrated Shielded Test Structure Description

The OTS Integrated Shielded Test Structure consists of a 10 inch thick cube of OTS proprietary, licensed conductive concrete mix with two embedded shielding grids. The approximate dimensions of the OTS Integrated Shielded Test Structure are 8’ x 8’ x 10’. One RF door and four WBC pipe penetrations installed as part of the RF shield barrier.

Testing Chart

OTS Detailed Testing Report


Omni-Threat Structures’ ballistic testing results demonstrated that 4” unreinforced shielding concrete meets UL752 Level 7, (5) 55gr 5.56mm NATO FMJ Rounds in 4.5” x 4.5” square pattern. Greater thickness can accommodate up to .50 Cal BMG rounds, UL752 Level 10+.

Sample Ballistic Test Report

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