China, November 26, 2025 - United Insulation, a professional exporter of insulation materials, officially announced today that its full range of glass wool materials has passed the UL723 test (Underwriters Laboratories 723 Standard). United Insulation's glass wool is now warranted to meet North America's strictest surface burning standards and is safe for use in high-risk situations such as schools, hospitals, and businesses, cementing United Insulation's claim as a top insulation material supplier to the North American marketplace.

 

 

What is UL 723 certification? Why is it considered the standards of fire safety for North American building materials?

 

The standard for "UL 723 certification" comes from Underwriters Laboratories (UL). It's based in Illinois in the USA and is an independent organization recognized as a leader in the world for certification and testing purposes. They have a standard which, although not exactly the same as the ASTM E84 standard, is just as good in terms of ensuring surface burning characteristics and passing the test in general. It was established in the 1950s and has been recognized and accepted by ANSI and in countries such as Canada.

 

For glass wool insulation materials, UL 723 focuses on:

- Flame Spread Index (FSI): measures how rapidly flame travel across the material when exposed to flame and should be ≤25 (Class A);

- Smoke Developed Index (SDI): measures the level of smoke produced in the burning process and normally not more than 450, though more-stringent requirements like not more than 50 are not uncommon.

- Overall composite material testing: this involves testing samples to determine the efficacy of glass wool fibers, binders, and facing materials by simulating real fires in the laboratory setting.

 

The certification for UL 723 gives the products and commodities the mark of approval with the "UL mark," which gives an assurance to fire departments in the US, codes, and insurance entities that these products have met all standards required for safety.

     

The importance and relevance of the certification to the US and international high-end fire protection industries are quite obvious.

 

- North American Core Market: Insulation must meet UL 723 to comply with building codes in all 50 states in the US and 10 states in Canada (IBC and NBC), especially in public areas such as hospitals, school rooms, hotels, etc.

- Global influence: UL 723 is often mentioned in elite projects in Saudi Arabia, UAE, Singapore, and South Korea, serving as an entry point and thus facilitating international trade through Belt and Road projects.

- Mandatory Rules are applicable in municipalities where materials have to be classified as FSI ≤ 25, while at the same time, materials have to ensure that they have a permissible SDI that should be ≤ 50. Damage cost in fire incidents in North America surpasses 10 billion US Dollars annually, while risk reduction levels are by 30+% simply by applying UL 723 materials.

- Economic value: Products that have compliance can lead to faster approvals in project, lower rework costs, and aid in the achievement of green building ratings like LEED and BREEAM.

 

United Insulation's fiberglass insulation have earned UL723 certification, an indicator of exceptional quality and dependability:

 

1.Fire safety performance: If FSI values are 0-25 and SDI values are very low - e.g., less than 450, it would not contribute to the flames nor smoke.

2.Durability: The material is stable even when subjected to high-temperature tests and has an expected life of more than 50 years in extreme climates.

3.Environmental and Health Safeguards: Made suitable for people with children, the elderly, and vulnerable groups by being the only product to work with GREENGUARD Gold low VOC standards.

4.Global Traceability: Each individual batch of manufactured goods can be traced and verified on their website Facilitating smooth exports to their partner countries like the US, Canada, South Korea, and Malaysia.

 

"UL 723 certification is the highest rating that can be obtained in rating fires in fibreglass insulation and we are proud that this certification enables us to offer consistent and effective insulation and protection from Chicago skyscrapers to Toronto hospitals with United Insulation fibreglass insulations." - United Insulation's Technical Director

 

About United Insulation

United Insulation is a leading fiberglass insulation supplier/exporter in China. Our products export to over 160 countries and regions, covering the United States, Canada, Australia, Korea, Malaysia, and New Zealand. Holding the following certifications, we commit ourselves to the production of high-quality, compliant, and safe fiberglass insulation products: UL 723, FM Approvals, CE, GREEN GUARD Gold, KS, SIRIM, BRANZ, CodeMark, and ISO 9001, 14001, 45001.

 

Website: www.unitedinsulation.com

Email: info@unitedinsulation.cn

UL Certification Inquiry: https://iq.ulprospector.com (You can enter HEBEI UNITED ENERGY TECH CO., LTD to verify)