Polysurlin Moisture Barrier

PFMB/PSMR, on Aluminum alloy 3003-H14 coils with PSMR( 75 micron )


PFMB/PSMR is a type of material that is applied to aluminum coils in order to prevent moisture from penetrating the surface. This is typically done to protect the aluminum from corrosion and other forms of damage that can occur as a result of exposure to moisture. PSMB, or Polysurlin Moisture Barrier, is similar to PFMB/PSMR and also used to prevent moisture to penetrate the surface on the Aluminum alloy 3003-H14 coils with PSMR( 75 micron ). It is a polyethylene-based product which is used as a moisture barrier on aluminum coils. Both are used as a protective layer to protect the aluminum coils from moisture

Since most people commonly think of corrosion in the industrial sector when they think of pipes, they are often aware of the risks that arise from corrosion under insulation (CUI). Many people neglect the inside surface of the metal jacketing while discussing corrosion. Corrosion can and does happen when water is present in a jacketed insulation system and comes into contact with the inside surface of the metal jacketing. In all situations (hot and cold), with all metal jacketing types, and with all insulation kinds, this form of corrosion on the internal surface of insulation jacketing is a hidden, serious, and expensive problem. The jacketing system becomes weaker as it corrodes from the inside, which can lead to increased water intrusion or damage to the insulation, vapor barriers, or pipes below the jacketing.

PFMB/PSMR are two different methods used to improve the flatness and surface quality of aluminum alloy 3003-H14 coils. PFMB is a process that uses a high-pressure feeder to level and straighten the material before it is cut into sheets or blanks. This process is typically used for materials that have a high degree of spring back, or that are prone to twisting or warping.

PSMR, on the other hand, is a process that uses multiple rolls to apply pressure to the material, which helps to improve its flatness and surface quality. This process is typically used for materials that have a lower degree of spring back, or that are less prone to twisting or warping.

Both PFMB and PSMR are used to improve the flatness and surface quality of aluminum alloy 3003-H14 coils, and the choice of which process to use will depend on the specific properties of the material and the desired end result.

There are five factors that make PFMB superior to paint or polykraft moisture barriers as a corrosion preventative for metal jacketing systems.

  1.     PFMB is 3 layers thick: While paint and polykraft are both formed of a single layer of material, PFMB/PSMR is constructed from three different layers of HDPE and LDPE. Each of these layers is made to be scratch-resistant and to prevent pinholes from forming, which could lead to water seeping through to the jacketing. 
  2.     Zero pinholesThe ASTM C1785 test is designed to determine the number of pinholes per 50 square feet of moisture barrier employed on jacketing interiors. Polykraft normally has roughly 16 pinholes, whereas paint typically has more than 19 pinholes. PFMB/PSMR, in contrast, has no pinholes. This significantly lessens the possibility of corrosion occurring when water comes into touch with the internal surface of the metal jacketing.
  3.     Scratch-resistant: Compared to paint or polykraft, PFMB/PSMR is significantly more scratch-resistant due to its three layers of thickness. Three-layer thick PFMB gives significantly more durability than paint, which is readily scratched off, or polykraft, which is easily torn. A scratch-resistant surface can be a crucial component in industrial applications where materials need to be durable and long-lasting to safeguard your metal jacketing system.
  4.     Excellent adhesion to the substrate: The metal jacketing substrate and PFMB/PSMR are heat-laminated at the manufacturing. It will be less likely to peel or flake off while in use because of the great adherence it provides to the metal surface. A vulnerability where water can enter is created if the moisture barrier lining the jacketing separates from the metal substrate.


  1.     Low water-vapor transmission rate: PFMB has a water vapour transmission rate (WVTR) of less than 0.05, in contrast to a polykraft barrier that has a WVTR of roughly 1. Additionally, unlike polykraft, PFMB/PSMR doesn’t have the ability to absorb water because it doesn’t contain any paper in its manufacturing. Using materials that prevent water penetration can be crucial to properly safeguarding your jacketing system because the goal is to prevent water from coming into contact with the surface of the jacketing.


By acting as a barrier to stop crevice, pitting, and galvanic corrosion, PFMB offers straightforward, inexpensive, and efficient protection against the metal jacket and pipe corrosion. The moisture barrier must be water-resistant, pinhole-free, robust, scratch-resistant, and durable to prevent water from creating corrosion in the jacket and pipes. Only PFMB has all of these essential qualities while also being affordable and simple to use.



PSMR stands for “polysurlyn moisture retarder,” which is a layer of material that is applied to the interior surface of metal roofing and wall panels to prevent moisture from penetrating and causing damage to the building. It typically consists of a polyethylene or polypropylene film that is laminated to the metal surface, and it is often used in conjunction with other moisture protection systems, such as vapor barriers and insulation.

Aluminum alloy 3003-H14 coils are a type of aluminum alloy that is composed of aluminum, manganese, and a small amount of magnesium. The H14 in the name indicates that it is strain hardened, which improves its strength and hardness properties.

The coils have PSMR (75 microns) coating on one side, which is a type of paint system that provides a smooth, high-quality finish on the surface of the aluminum. The other side of the coils is a bare stucco finish, which is a rough, textured finish that is commonly used on aluminum coils. The thickness of the coils is 0.5 mm.

The internal surface of Polysurlyn, a very effective moisture retarder, is heated and pressure-bonded to a polyethylene sheet with a thickness of 50-200 um. Polysurlyn Moisture Barrier is heat bonded to the inside surface of all forms of metal jacketing in the factory to assist prevent pitting, crevice, and galvanic degradation of the inner appearance of the metal jacketing and the underlying insulated pipe, tank, or equipment. Through seams or damage to the metal jacketing, water can get into the installed insulation system, which leads to corrosion. Polysurlyn is manufactured from layers of the film: 1 mil high-density polyethylene and 1 mil low-density polyethylene. With careful pressure and heat, this multilayer sheet is laminated to the inside side of the aluminum and stainless steel jacketing. By using three layers of 3 mils thick Polysurlyn Moisture Barrier (PFMB/PSMR) film instead of the more common single layer of 1 mil Polykraft Moisture Barrier, pinholes is prevented. Corrosion is a possibility and does happen when water is present and touches the metal jacket. This can occur with any type of insulation and in any application (hot, cold, rooftop, commercial, etc.).


Polysurlyn moisture barrier has advantages:


1, Simple, inexpensive, and efficient resistance against the pipe and metal jacket corrosion;

2. In cold and hot pipe/tank applications provides a barrier to crevice or pitting corrosion on the inner jacket surface;

3, acts as a barrier against the jacket or pipe’s galvanic corrosion in hot situations;

4, Less water absorption than kraft paper;

5, Won’t lose quality, turn yellow, or tear when exposed to water;

6, offers protection against abrasion during installation;

7, Long-term reliability and immunity to numerous environmental toxins.


Download our Aluminium coils Catalog

Dana Steel Industry Polysurlin Moisture Barrier (PSMB) on Aluminium coils

About Us:

DANA STEEL is a leading manufacturer of various steel products, covering a wide range of products and serving thousands of clients across the globe, at Dana Steel we ADD VALUE TO STEEL. Our products are proudly MADE IN UAE and exported to more than 45 countries across the globe. Salerno port , Venezia Port, La Spezia port, MARGHERA PORT,LASPEZIA PORT. Sandwich Panels, Profile Sheets, Decking Sheets, Aluminium Panels, Composite Panels, Z Purlins, C channels, Metal Lintels, roofing sheets, Fencing Sheets, Steel sheets, stainless steel.


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