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Online film thickness detection solution

2025-08-27 14:44:28 Lucy

Brief Introduction

UNICORN TECHNOLOGY CO., Ltd. was established in November 2012 and registered in Hong Kong, China. It is a subsidiary of Yiying Technology (Shanghai) CO., LTD.

Yiying Technology (Shanghai) Co., Ltd. mainly provides various precision imported process and measurement equipment for semiconductor, new energy enterprises, universities and research and development centers. We offer one-on-one sales services, technical support, spare parts management and consulting services.

What is Parylene?

Poly-para-xylylene (abbreviated as parylene) is a kind of high-molecular polymer, and in China it is also called""Parylene.
Parylene was developed by union Carbide Co in the United States in the mid-1960s. Parylene, a new type of conformal coating material developed and applied, can be classified into various types such as N-type, C-type, D-type, and HT-type based on their molecular structures.

Basic characteristics of commonly used parylene materials

(1) Parylene C powder is waterproof and has 30% stronger anti-corrosion performance than N powder. Its voltage resistance is lower than that of N powder. C powder is suitable for PCBA.
(2) Parylene N powder has high voltage resistance and water resistance, but its anti-corrosion performance is lower than that of C powder. It is suitable for silicon steel sheets of micro motors, etc.
(3) The performance of Parylene HT-2 powder in terms of water resistance, anti-corrosion and voltage resistance has been improved by about 15% compared with C-N powder. It has been enhanced on the basis of C-N powder and has already replaced the production application of C-N powder.
(4) Parylene (F-VT4)-(F-AF4) powder, with strong UV resistance, is widely used in outdoor products. However, the material cost is relatively high, and customers are temporarily unable to accept the unit price.

What is Parylene C?

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Parylene C is a commercially valuable member of the series. It is made of the same monomer, except that one of the aromatic hydrocarbon hydrogen atoms is replaced by a chlorine atom.

It combines excellent dielectric properties and physical and mechanical propertiesIt has very low permeability to moist and corrosive gases.

It can provide true pinhole-free conformal isolation. It meets the US military standard MIL-46058C and is a material for coating important circuit boards.

Characteristics of Parylene

Parylene deposition can be prepared by polymerizing active monomer gas onto the surface of objects, which is different from the general method of liquid coating.

Its active molecules form a completely coated polymer film on the surface of the object to be coated, which can be applied to any shape of surface without creating dead corners, including sharp edges, crevices and tiny pinholes.

The film thickness can be consistently applied to various parts of the product, ranging from 1um to 50um.

Parylene industry applications

Picture Keywords

Introduction to the manufacturing process of Parylene

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Parylene is produced by chemical vapor deposition (CVD).

The additive process is divided into three steps:
1. Under vacuum conditions, the solid powder-like dimer of para-xylylene (dimer) is heated and vaporized at 120℃.

2 The gaseous para-xylene dimer was cracked into the active monomer of para-xylylene at 650℃.

3 Gaseous active monomers are deposited and polymerized into Poly-para-xylylene films at room temperature.

Three key elements for production control of Parylene process equipment

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Three characteristics of Parylene product defects

The leader in the Parylene industry

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On January 7th, Japanese polymer materials company KISCO announced the acquisition of American Specialty Coating Systems(SCS).

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Problems that are prone to occur during the production process and supervision

Question

1. The purity of the material decomposition during the coating process is insufficient (the pressure inside the cylinder is controlled, resulting in poor thickness uniformity at that time)
2. The material stayed in the cylinder for too long, causing the product to turn white
3. The pendulum inside the product cylinder involves the gas phase flow of raw materials and can also affect the uniformity of the product's thickness
4. During the production process, the cylinder gets clogged and the film thickness of the product does not increase
5. The structural design of the wind shield is very important. If the residual materials are not properly handled, it will cause the feeding pipe to be blocked

Temperature and pressure control, online monitoring of thickness

The product appears white or blue, has poor adhesion and uneven film thickness.

Filmetrics - The Advantages of Online Measurement

Non-destructive and non-contact measurement and early warning

Production process monitoring - Real-time feedback of production data to enhance product quality
2. Enhance production efficiency - Set production targets and issue alarm prompts
3. Save material costs - Reduce the tolerance of product indicators, and material savings are visible
4. Reduce labor costs - Direct online data supervision from the monitoring room
5. Cylinder blockage and cylinder stop monitoring - Save materials and reduce the defect rate of manual rescue
6. Set an exact thickness range for the product
7. Facilitate the adjustment of processes for different products

Filmetrics - Schematic diagram of the production line layout for online monitoring and measurement of the production process

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