Brown PTFE single-sided sodium‑modified film

The brown single-sided sodium‑fluorinated PTFE film is made of… PTFE (Polytetrafluoroethylene) film as the base material, using sodium… -  The naphthalene solution was used to perform sodium‑based activation treatment on one side of the membrane, resulting in a brownish‑tan coloration of the treated surface, while the untreated side retained its original appearance. PTFE Inert surface. The sodium-treated side is broken. PTFE It features an extremely low surface energy, enabling direct adhesion to substrates such as adhesives, rubber, metals, and plastics, thereby addressing the limitations of conventional materials. PTFE A persistent challenge in adhesion; on the other hand, it retains the excellent intrinsic properties of pure PTFE, making it a commonly used fluoropolymer film material in the composite, bonding, and sealing industries.

Physicochemical properties

1.  Chemical resistance: Resistant to strong acids, strong bases, strong oxidizing agents, and various organic solvents; with the exception of molten alkali metals, it is virtually unaffected by chemical media.

2.  High-temperature and low-temperature resistance: continuous operating temperature - 200 °C～ 260 ℃, with stable performance under both high and low temperature conditions, and resistant to embrittlement and deformation.

3.  Excellent electrical insulation: extremely low dielectric loss, high breakdown voltage, and stable insulating properties over a wide temperature and frequency range.

4.  Low friction coefficient: The unactivated surface exhibits an extremely low coefficient of friction and possesses self-lubricating, anti-adhesive, and wear-resistant properties.

5.  Single-sided adhesion: The sodium‑activated surface generates active functional groups, enabling strong bonding with epoxy resins, polyurethanes, pressure‑sensitive adhesives, rubbers, and other materials.

6.  Aging and weather resistance: UV-resistant and resistant to atmospheric aging, ensuring no degradation or cracking even with prolonged outdoor use.

7.  Extremely low permeability: it effectively blocks water vapor and the penetration of media, providing excellent sealing and barrier performance.

Application areas

1.  Aerospace field: In aerospace sealing gaskets and cable sheathing, it provides high- and low-temperature insulation and cushioning sealing, while also ensuring robust bonding between the fluoropolymer film and metallic components.

2.  Medical field: In medical device diaphragms and anti-corrosion liners, it provides resistance to chemical solutions, exhibits biological inertness, and ensures adhesion and secure fixation to the device substrate.

3.  In the field of chemical engineering, it serves to resist highly corrosive media in anti-corrosion equipment linings and pipeline seals, with a PTFE membrane bonded to the surface of carbon steel substrates to provide corrosion protection.

4.  Electronics and electrical engineering: In flexible insulating gaskets and lithium‑battery insulation components, it provides high‑temperature resistance, facilitates bonding and assembly, and offers isolation and protection.

5.  In the field of mechanical seals: for pump and valve gaskets and sliding wear‑resistant components, it provides low‑friction self‑lubrication and is compounded into rubber. /  The effect of reducing wear on metal substrates.

Product Competitive Advantages

1.  Stable activation quality: The single-sided sodium treatment process is well‑established, ensuring uniform activation and a consistent brownish‑tan color; it avoids localized activation failure and fluctuations in adhesion strength. Activation depth is controllable, preventing excessive penetration into the membrane’s backside, thereby preserving the original properties of that surface. PTFE Anti-adhesion performance.

2.  High purity of the membrane substrate: High-purity materials are selected. PTFE The raw material features low impurity content, is free of pinholes and air bubbles, exhibits uniform thickness, boasts high tensile strength, and is resistant to breakage.

3.  Bonding is durable and reliable: the activated surface exhibits strong adhesion, and under prolonged high‑ and low‑temperature cycling as well as chemical immersion, the adhesive layer remains intact, outperforming conventional simple activation films.

4.  Flexible customization: Thickness, width, and roll length can be tailored to your specifications; narrow-width slitting is supported, ensuring compatibility with customers’ automated laminating equipment.

5.  Strong batch-to-batch consistency: With years of experience in fluoroplastic processing, we conduct random inspections on each batch for adhesion strength and surface energy, ensuring stable performance and reducing defect rates in customers’ mass production.

6.  Safe and controllable: After sodiation, thorough washing and neutralization ensure low residual levels and the absence of extraneous contaminants, making it suitable for medical and food‑related applications.

Selection Guide

Customers can perform a preliminary selection based on operating pressure, temperature, bonded substrate, and service medium.

|  Model number |  Thickness |  Width range |  Recommended Scenarios |

| ---- | ---- | ---- | ---- |

|HN-BN0.05|0.05mm|10 – 1200mm | Thin composite, electrically insulating, with a light-load lining. |

|HN-BN0.08|0.08mm|10 – 1200mm | Universal model, with gasket‑reinforced composite construction and standard anti‑corrosion lining—widely used in the market. |

|HN-BN0.10|0.10mm|10 – 1200mm | Mechanical wear-resistant components, medium-pressure sealing composite components |

|HN-BN0.20|0.20mm|10 – 1000mm | Heavy-duty anti-corrosion lining, adhesive-lined chemical equipment |

Selection Tips:

-  Bonding‑dominant, lightweight composites: prioritize 0.05/0.08mm；

-  Requires wear resistance and the ability to withstand frictional sliding: select 0.10mm and above;

-  Strongly corrosive +  Large temperature fluctuations: we recommend the thicker version. 0.20mm；

Custom development is available for special widths and specific surface energy requirements.

Precautions for Use

1.  Activated surface identification: The brown side is the sodium‑activated bonding surface and can only be bonded on the brown side; the other side remains its natural color. PTFE Do not bond; ensure the correct side is facing up to prevent bonding failure and scrap.

2.  Storage conditions: The sodium‑activated layer has a shelf life; it is recommended to store it in a cool, dry, and dark place at a temperature of… 25 Below ℃; avoid direct sunlight, high temperatures, and high-humidity environments to prevent degradation of active functional groups and reduced adhesion. It is recommended that, upon receipt, … 6  Use up within one month.

3.  Substrate Pre-treatment: Before bonding, the metal… /  Surface sanding, degreasing, cleaning, and drying of plastic substrates can significantly enhance adhesion strength, reduce delamination-related rework, and improve the yield of finished products.

4.  Cutting Process: Use a sharp blade to minimize fraying and tearing at the film edges; during automated lamination, carefully control tension to prevent the film from stretching and thinning, which could compromise its performance.

5.  Welding /  Secondary high temperature: The sodic surface is not recommended for prolonged exposure beyond 260 Baking at high temperatures can degrade the activated functional groups, leading to bond failure.

6.  Loss Control: After opening the roll material, ensure proper dust protection; dust on the activation surface can significantly reduce bonding strength. When slitting, leave a small process margin to minimize waste from edge and corner scraps.

Summary

Brown PTFE single-sided sodium‑modified film, which combines PTFE With excellent corrosion resistance, high‑temperature stability, and self‑lubricating insulating properties, this product addresses the industry’s longstanding challenge of bonding ordinary PTFE by employing single‑sided sodium activation. The activation is uniform, the coating is stable, and it can be widely applied in chemical corrosion protection, aerospace, electronics, medical devices, mechanical sealing, and other fields.

We offer standard rolls in multiple specifications and also provide custom sizing, along with tailored selection recommendations to align with your manufacturing processes. With proper storage, clear identification of the front and back sides, and thorough substrate pretreatment, we can reliably achieve strong adhesion between fluoropolymer films and a wide range of substrates, helping you extend the service life of sealing, corrosion‑resistant, and insulating components while reducing production defects and overall costs.