PP+PA High Barrier Film for Roof Underlayment & Waterproofing Membranes

High-Strength PP+PA Film | Puncture Resistance | Moisture Barrier | Customizable Release Force

UPASS PP+PA Film is a multilayer functional film developed for roof underlayment, waterproofing membranes, self-adhesive waterproofing membranes and butyl waterproofing tape.

Combining polypropylene (PP) with a PA nylon reinforcement and barrier layer, the film provides a balance of mechanical strength, puncture resistance, flexibility and moisture barrier performance.

Compared with conventional PP release film, PP+PA Film is designed for applications where the film may need to withstand higher mechanical stress, high-adhesion adhesive systems or thicker adhesive layers.

The film is available in 30–180 μm thickness and 300–2600 mm slitting width, with customizable release force from 5–100g according to the application.

Why Use PP+PA Film for Roofing & Waterproofing?

Roof underlayment and waterproofing membrane products can require more than a basic polymer film.

During manufacturing, converting, transportation and installation, the film may be exposed to pulling, puncture, adhesive pressure and moisture.

A conventional PP film may not provide enough mechanical strength for demanding applications.

PP+PA Film combines the flexibility of PP with the reinforcement and barrier properties of PA nylon to provide a more robust film solution.

Key Performance Advantages

• High mechanical strength
• Improved puncture resistance
• Moisture and water-vapor barrier
• Oil and grease resistance
• Stable and controllable release force
• Good flexibility
• Suitable for high-adhesion adhesive systems
• Customizable thickness, width and release force

The supplied product specification indicates MD tensile strength ≥18 MPa, with puncture resistance more than 50% higher than pure PP release film.

PP+PA Film for Roof Underlayment

PP+PA Film can be used as a functional film material for roof underlayment applications.

Roof underlayment products need to maintain their integrity during manufacturing, handling and installation. Film breakage or puncture can affect production efficiency and the performance of the finished underlayment.

The PA reinforcement layer helps improve mechanical performance, while the PP-based construction maintains flexibility.

For roof underlayment manufacturers, PP+PA Film can be considered when the application requires:

• Higher film strength
• Improved puncture resistance
• Flexible film performance
• Moisture barrier properties
• Stable surface characteristics
• Customized film dimensions

UPASS can supply the film according to the required thickness and width for downstream roof underlayment production.

PP+PA Film for Waterproofing Membranes

PP+PA Film is also designed for waterproofing membrane applications, particularly self-adhesive and adhesive-based membrane systems.

The film can provide a combination of mechanical reinforcement, barrier performance and controlled release where required by the membrane construction.

For self-adhesive waterproofing membranes, release performance is an important consideration because the film must remain properly positioned during storage and handling while allowing controlled removal during installation.

PP+PA Film offers customizable release-force levels:

• Light Release: 5–15 g
• Medium Release: 15–40 g
• Heavy Release: 40–100 g

The appropriate release force should be selected according to the adhesive formulation and actual membrane construction.

PP+PA Film for Butyl Waterproofing Tape

PP+PA Film can also be used for butyl waterproofing tape and related adhesive waterproofing products.

Butyl adhesive systems can require a release film with sufficient mechanical strength to withstand converting, slitting, winding and handling.

Compared with standard PP release film, PP+PA Film provides enhanced mechanical and barrier performance through its PA reinforcement layer.

This makes it suitable for applications where customers are looking for a stronger release film for:

• Butyl waterproofing tape
• Self-adhesive waterproofing products
• High-adhesion sealing systems
• Waterproofing adhesive products

Release force can be selected according to the adhesive system and required peeling behavior.

High Strength & Improved Puncture Resistance

Mechanical strength is one of the main advantages of PP+PA Film.

The current specification provides an MD tensile strength of ≥18 MPa.

The PA nylon layer also improves resistance to puncture and mechanical damage. According to the supplied product information, puncture resistance is more than 50% higher than pure PP release film.

This performance is particularly relevant to roofing and waterproofing products where the film may experience:

• Tension during processing
• Mechanical handling
• Slitting and converting
• Pressure from adhesive layers
• Puncture during production or installation

For customers currently using conventional PP film and experiencing film breakage or puncture problems, PP+PA Film provides an alternative film structure for evaluation.

Moisture Barrier for Waterproofing Applications

The PA nylon layer also provides enhanced barrier performance compared with conventional PP and PE release films.

For roof underlayment and waterproofing products, controlling moisture and water-vapor transmission can be an important part of the overall material design.

PP+PA Film provides a functional barrier layer while maintaining the flexibility associated with a PP-based film.

The film also provides resistance to oil and grease, making it suitable for selected adhesive and waterproofing systems where these properties are required.

Actual barrier performance should be evaluated according to the complete film structure and finished product design.

PP+PA Film Specifications

Final specifications should be confirmed according to the customer's application, adhesive system and production requirements.

How to Choose PP+PA Film for Waterproofing

The correct PP+PA Film specification depends on the finished waterproofing or roofing product.

1. Confirm the Application

First determine whether the film is for:

• Roof underlayment
• Waterproofing membrane
• Self-adhesive waterproofing membrane
• Butyl waterproofing tape

2. Confirm the Adhesive System

Different adhesive systems require different release characteristics.

For example, the required release force may fall within:

5–15 g → Light Release

15–40 g → Medium Release

40–100 g → Heavy Release

3. Confirm Thickness and Width

UPASS provides:

Thickness: 30–180 μm

Slitting Width: 300–2600 mm

The appropriate specification depends on the customer's equipment and finished product construction.

4. Check Processing Temperature

The current temperature specification is:

80°C long-term

120°C short-term

If the production process involves higher temperatures, the actual process conditions should be discussed before selecting the film.

5. Identify Existing Film Problems

If you are currently using standard PP release film, let us know if you experience:

• Film tearing
• Puncture
• Adhesive leakage
• Moisture-related problems
• Unstable release
• Insufficient film strength

This information helps determine whether PP+PA Film is suitable for your application.

PP+PA Film Manufacturer for Roofing & Waterproofing

UPASS manufactures functional polymer films for roofing, waterproofing and adhesive applications.

Our PP+PA Film is designed for downstream manufacturers producing roof underlayment, waterproofing membranes, self-adhesive membranes and butyl waterproofing tape.

We can discuss film requirements based on:

• Application
• Thickness
• Width
• Adhesive type
• Release force
• Processing temperature
• Mechanical requirements

Instead of selecting a film only from a standard specification, customers can provide their current film sample, technical data or finished-product requirements for evaluation.

Frequently Asked Questions

What is PP+PA Film?

PP+PA Film is a multilayer functional film combining polypropylene and PA nylon. The PA layer provides reinforcement and barrier performance, while the PP-based construction provides flexibility and processability.

Can PP+PA Film be used for roof underlayment?

Yes. PP+PA Film is designed for roofing applications including roof underlayment, where higher strength, puncture resistance and barrier performance may be required.

Can PP+PA Film be used for waterproofing membranes?

Yes. It can be used for selected waterproofing membrane and self-adhesive waterproofing membrane constructions according to the required film and adhesive specifications.

Can PP+PA Film be used for butyl waterproofing tape?

Yes. It can be evaluated as a release film for butyl waterproofing tape and other adhesive waterproofing products.

What is the thickness range?

The available thickness range is 30–180 μm.

What is the maximum slitting width?

The available slitting width is 300–2600 mm.

What release force is available?

The standard release-force ranges are 5–15 g, 15–40 g and 40–100 g, with release force customizable according to the application.

What is the temperature resistance?

The supplied specification indicates 80°C for long-term use and 120°C for short-term exposure.

Request PP+PA Film for Your Roofing Application

Looking for PP+PA Film for roof underlayment or waterproofing membrane production?

Send us your current film specification or application requirements, including:

• Application
• Film thickness
• Film width
• Adhesive type
• Required release force
• Processing temperature
• Current release film
• Estimated quantity

UPASS can evaluate your requirements and provide a suitable PP+PA Film solution.

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