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Insulation World Kenya Limited is the leading direct importer and distributor of high-quality DURATUF INSULATING MATTING ASTM D178 Class 3, Type I in Nairobi Kenya. Our rolls come in the below specifications: 

Standard Size  –  1Mtr. Wide x 10.0 Mtr. Long.

Standard Color – Black without Metallic Derivatives.

Surface Design: TOP FINE RIBBED & BOTTOM TEXTURED ASTM D178 Class 3, Type I

Get in touch with us to place an order through +254 722 401 1754 or email us via


Electrical safety is a top priority in industries where high-voltage equipment poses significant risks to personnel and operations. Insulating mats, designed to protect against electrical shocks, play a crucial role in creating a safe work environment. Among the standards governing these mats, ASTM D178 stands out as a benchmark for quality and reliability. In this article, we explore the characteristics, applications, and importance of ASTM D178 Class 3, Type I insulating mats in ensuring electrical safety in high-voltage environments.

Understanding ASTM D178 Standards

ASTM D178 establishes the specifications for rubber insulating mats used in electrical applications. This standard defines various classes and types of mats, each tailored to specific voltage levels and performance requirements. Compliance with ASTM D178 ensures that insulating mats meet rigorous safety standards, providing effective protection against electrical hazards.

Class 3 and Type I Classification

Within the ASTM D178 standard, insulating mats are classified based on their maximum use voltage and intended applications. Class 3 mats have a maximum use voltage of 26,500 volts AC or 39,750 volts DC, making them suitable for use in high-voltage environments. Type I classification further categorizes mats based on their thickness and mechanical properties, with Type I mats offering general-purpose insulation and mechanical protection.

Characteristics of ASTM D178 Class 3, Type I Insulating Mats

  1. High Dielectric Strength: Class 3, Type I mats exhibit a high dielectric strength, allowing them to withstand substantial voltage levels without conducting electricity. This property is essential for protecting workers from electric shocks in high-voltage environments.
  2. Insulating Properties: These mats provide reliable insulation against electrical currents, reducing the risk of electric shock hazards for personnel working near live electrical equipment.
  3. Mechanical Protection: Type I mats offer mechanical protection in addition to electrical insulation, making them suitable for areas where heavy machinery or equipment is in use.
  4. Durable Construction: ASTM D178 Class 3, Type I mats are constructed from durable rubber compounds that resist abrasion, tearing, and punctures, ensuring long-lasting performance in demanding conditions.
  5. Chemical and Weather Resistance: The materials used in these mats are resistant to chemicals, oils, and weather exposure, making them suitable for indoor and outdoor applications in various industries.

Applications of ASTM D178 Class 3, Type I Insulating Mats

  1. High-Voltage Substations: Class 3, Type I mats are commonly used in high-voltage substations to provide a safe working surface for personnel accessing switchgear, transformers, and other electrical equipment.
  2. Power Generation and Transmission: Utilities and power generation facilities employ these mats to protect workers during maintenance and repair activities on high-voltage equipment.
  3. Industrial Manufacturing: Industries with high-voltage machinery, such as manufacturing and heavy engineering, use Class 3, Type I mats to ensure the safety of operators and maintenance personnel.
  4. Electrical Testing and Research Facilities: Laboratories and testing facilities where high-voltage electrical experiments are conducted require these mats to protect personnel and equipment from electrical risks.
  5. Renewable Energy Installations: Wind farms, solar power plants, and other renewable energy installations utilize Class 3, Type I mats to safeguard workers during installation, maintenance, and troubleshooting of electrical systems.

Significance of ASTM D178 Class 3, Type I Mats in Electrical Safety

The use of ASTM D178 Class 3, Type I insulating mats is instrumental in promoting electrical safety in high-voltage environments. Here are key reasons highlighting their significance:

  1. High-Voltage Protection: Class 3 mats provide robust insulation against high-voltage electrical currents, offering critical protection to workers in environments with elevated electrical hazards.
  2. Compliance with Standards: Adhering to ASTM D178 standards ensures that mats meet stringent performance criteria, guaranteeing their effectiveness in preventing electrical accidents.
  3. Versatility: These mats are versatile and suitable for a wide range of high-voltage applications, making them a practical choice for various industrial settings.
  4. Durable Performance: The durable construction of Class 3, Type I mats ensures long-lasting performance, reducing maintenance costs and downtime.
  5. Risk Mitigation: By reducing the risk of electric shocks and related injuries, these mats contribute significantly to mitigating workplace hazards and promoting a safer work environment, especially in high-voltage environments.


ASTM D178 Class 3, Type I insulating mats are indispensable in safeguarding personnel and equipment in high-voltage environments. Their high dielectric strength, insulation properties, mechanical protection, and durability make them essential components of electrical safety protocols. Investing in quality Class 3, Type I mats demonstrates a commitment to protecting workers from electrical hazards and ensuring compliance with industry standards. By incorporating these mats into safety strategies, organizations can create safer work environments and mitigate risks associated with high-voltage operations.

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