Aluminized Jacket and Coat Buying Guide for Foundry and Steel Mill Metal Workers - X1 Safety

Aluminized jackets for molten metal & radiant heat: protection without compromise


Whether you’re working in a steel mill, foundry, or welding shop, extreme heat, molten metal splash, and radiant exposure are constant threats. Ambient temperatures often exceed 100 °F, and in those conditions, traditional PPE just doesn’t cut it.

Aluminized jackets and coats are vital gear. They reflect up to 95% of radiant heat and shield against molten splash—from ferrous and non‑ferrous metals. Today’s aluminized apparel is also lighter and more breathable, reducing heat stress without sacrificing protection.

 

Aluminized vs. non-aluminized: choose the right suit

Feature

Aluminized jacket

Non-aluminized jacket (e.g., carbon fleece)

Radiant heat reflection

Reflects ~95% of thermal energy

Absorbs more heat, lesser radiant protection

Weight & mobility

Traditionally heavier, but modern fabrics are lighter

Generally lighter, better for movement

Molten splash protection

Handles ferrous metals (up to 2900°F)

Suitable for non-ferrous metals (~1800°F)


Fabric & design highlights

  •  Aluminized Rayon: Lightweight & cost-effective, but less abrasion-resistant
  • Carbon/Para-Aramid OPF Rip-Stop (e.g., H5 material): Strong, heat-stable, and ideal for heavy-duty environments
  • Acrysil (16 oz) & OPF/Kevlar blends (14 oz): Balanced mix of protection, flexibility, and durability
  • Key features: underarm venting, ventilated backs, articulated elbows, snap closures—designed for mobility and function

Ferrous and non-ferrous molten metal splash protection

Molten metal splash is one of the most dangerous hazards in steel mills, foundries, and metalworking environments. It occurs when liquids, moisture, or wet materials make contact with molten metal, causing violent explosions that eject high-temperature molten material into the air.

These splashes can burn through standard clothing in seconds and cause severe or even fatal skin injuries.

For workers exposed to ferrous metals, such as carbon steel, stainless steel, or cast iron-aluminized safety clothing is critical. These garments are specifically engineered to shed both ferrous and non-ferrous molten metal splash before it makes contact with the skin.

Aluminized jackets, coats, and coveralls use multi-layer fabrics with reflective surfaces that cause molten metal to bead up and roll off rather than absorb or stick, significantly reducing the risk of penetration and burn-through.

Radiant heat protection

In proximity to metal fabrication furnaces, blast furnaces, and foundry crucibles, temperatures frequently exceed 1,000°F. Even without direct contact, prolonged exposure to radiant heat can lead to:
  • Deep dermal burns
  • Dehydration and heat stress
  • Permanent tissue damage or disfigurement
Aluminized outerwear is the industry standard for radiant heat protection. These garments reflect up to 95% of thermal radiation, helping to prevent burns and reduce thermal load on the body—even in close-range applications.

For maximum effectiveness, aluminized jackets should be worn alongside:
  • Flame-resistant base layers
  • Heat-resistant gloves and boots
  • Proper respiratory protection where metal fumes are present

 

Aluminized jackets vs. non-aluminized jackets

Durable, dependable, multi-hazard protection is essential in high-heat environments like foundries and mills. Risk exposure to molten metal substances requires head-to-toe protection. This includes PPE that protects the torso and arms like aluminized jackets, coats, or suits. Aluminized sleeves and aprons may also be included in a PPE plan for welders, mill & foundry workers.

Workers in a nonferrous foundry may choose to wear non-aluminized jackets constructed from fabrics that protect from radiant heat and non-ferrous molten metal splash (800-1800 degrees). Non-aluminized jackets are more lightweight, which can increase productivity, help workers avoid heat-stress injuries, while still provide resistance to radiant heat and non-ferrous molten metal splash hazards.

Aluminized jackets offer protection against high contact heat and radiant heat as well as molten aluminum and iron splash (up to 2,900 degrees) and non-ferrous molten metal splash. Aluminized coats and jackets – when worn with other aluminized PPE and secondary protection - offer a suitable level of protection for workers in ferrous metal foundries and steel mills.

Aluminized Jackets vs. Non-Aluminized Jackets

 

Aluminized PPE safety standards

ASTM International Safety Standards for protective clothing worn by industrial workers exposed to hazards like molten metal splash and radiant heat include:

ASTM F955 - An aluminized jacket for foundry and metal work should be constructed out of fabric that has met the requirements of the ASTM F955 pour test. The ASTM F955 standard is used to demonstrate and measure the protective performance of fabrics against heat transfer and molten metal splash. ASTM F955 testing ensures that the aluminized fabric has been evaluated for its ability to shed molten metal from its surface without sticking.

ASTM F1939 - An aluminized jacket for foundry and metal work should be constructed out of fabric that has met the requirements of the ASTM F1939 test method, which is required by ASTM F1002 (Standard Performance Specification for Protective Clothing and Materials for Use by Workers Exposed to Specific Molten Substances and Related Thermal Hazards). ASTM F1939 uses a continuous heat source to measure the radiant heat resistance of flame-resistant clothing materials.

Aluminized jackets are constructed out of inherently flame-resistant materials that won’t burn, support combustion, or melt. However, regarding arc flash risk: “Aluminized clothing does work effectively to block radiant energy from an Arc Flash event; however, since aluminum is a good conductor of electricity, the aluminized fabric can increase the probability of an Arc Flash accident” (Source: EE Online). Aluminized safety clothing that also meets OSHA 1910.269 arc flash protection standards offer the most multi-hazard protection available for foundry, mill, and other metalworkers.

 

Aluminized coat and jacket fabrics and design features

Along with offering protection from molten metal splash, radiant heat, and other thermal hazards, important features for aluminized jackets include abrasion resistance, durability, mobility, and comfort. Fabric type, length, sizing, design features such as vented back for airflow, and cost also need to be considered before purchasing any aluminized coat, jacket, suit, or other molten metal protective clothing.

Standard aluminized fabrics for jackets and coats include:

1. Aluminized rayon

Pros: Aluminized rayon is an economical aluminized fabric, relatively inexpensive compared to other aluminized materials. Aluminized rayon is lightweight, flexible, and capable of reflecting radiant heat at the same level as other materials.

Cons: Aluminized rayon does not perform as well with resisting abrasion and molten metal splash as other materials used in molten metal splash protective clothing. Fabric that is more likely to tear over time may be a concern in high-risk work environments.

2. Aluminized fiberglass/para-aramid fiber blend

Pros: Aluminized fabrics featuring a blend of fiberglass and para-aramid fibers offer high temperature resistance and abrasion resistance.

Cons: The heavier weight of this material increases the risk of heat stress injuries and decreases work productivity by providing less flexibility and comfort.

3. Aluminized OPF carbon/kevlar

Pros: OPF (organic-coated para-aramid fiber) and carbon fiber or Kevlar blend fabrics provide great abrasion strength. These blends are durable, resistant to tearing, and will effectively repel molten metal splash at high temperatures.

Cons: Carbon fiber or Kevlar-based aluminized fabrics are generally more expensive and can become rigid over time.

According to Industrial Safety & Hygiene News, “There is a common perception among professionals working in molten metal and high-heat environments that aluminized protective apparel must be heavy and rigid in order to adequately protect against both radiant heat and molten metal splash. […] New fabrics and technologies are now being introduced that do not require professionals to sacrifice comfort and productivity for protection. These fabrics can protect against both radiant heat and molten metal splash at a fraction of the weight of current alternatives, and they offer significantly improved flexibility.”

PPE helps prevent disfiguring, severe or fatal thermal burns, and deep dermal burns from molten metal splash.  Lightweight yet highly protective aluminized fabric innovations from leading industrial PPE brands like National Safety Apparel have made the important task of reliably, and comfortably, protecting yourself or your employees from fatal workplace accidents and injuries easier than ever.

 

Best aluminized jacket for comfort, protection & performance

National Safety Apparel is one of the largest manufacturers of aluminized protective clothing in U.S. They offer a variety of aluminized jacket and clothing options including highly protective blends of Kevlar and OPF fabrics.

National Safety Apparel’s Carbon Armour line now includes their new lightweight 11 oz. aluminized OPF Ripstop Fabric blend. Carbon Armour’s proprietary Rip Stop crosshatch woven OPF blends are ultra-durable and will not tear. Independently tested to meet ASTM F955 molten metal, ASTM F1939 radiant heat, and OSHA 1910.269 arc flash protection standards, the bestselling Carbon Armour H5 Foundry Aluminized Jacket offers 2,900°F Molten Metal and 3,000+°F Radiant Heat Protection as well as patented design features for mobility & comfort including:

  1. Underarm gussets – which extend range of movement and arm comfort
  2. ­Articulated elbows – providing extra material that will not wear out for extended garment life & mobility
  3. ­Ventilated action back – this feature provides elasticity, extended movement, comfort, and airflow
  4. ­Snap Front Closure with Leather Pull Tabs – this design lets you open the jacket while wearing gloves
Carbon Armour H5 Foundry Jacket Coat

The Carbon Armour H5 jacket will shed both ferrous and non-ferrous molten metals. It is available in custom sizes and lengths from 30-50 inches.

An aluminized jacket’s protective performance should be exceptional without sacrificing comfort, mobility, and productivity in high-heat environments. The Carbon Armour H5 Foundry Aluminized Jacket accomplishes all this with highly protective yet flexible fabric and high tech design at an affordable price, making it one of the best aluminized jackets available for welding, mill, and foundry workers – especially those working with molten steel.


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