BUF

Build-Up Film

Insulating film material for multilayer structures in high‑performance semiconductor package substrates

BUF (Build‑Up Film) is a high‑insulation film material used to form insulating layers between circuit layers in the multilayer structures of high‑performance semiconductor package substrates such as FC‑BGA. BUF plays a key role in advanced semiconductor packaging by enabling high‑density wiring, improving signal‑transmission quality, and ensuring substrate stability.

As package architectures evolve toward higher integration and increased layer counts, BUF performance has become increasingly critical. With excellent dielectric properties, dimensional stability, and reliability, LG Chem’s BUF enhances customers’ design flexibility and product robustness, delivering essential material value for next‑generation high‑performance semiconductor development.

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Features

Excellent Dielectric Properties

Thermal & Mechanical Stability

Fine‑patterning & Multilayer Process Stability

Outstanding Moisture & Chemical Resistance

Applications

PC CPU/GPU

Server CPU/GPU

Network IC

Automotive MCU/ADAS

Product Functions and Structure

Product Group

Advanced Adhesive Products and Their Functions

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Product Classification

Product Classification :Category ,Grade ,Features ,Applications ,Download
Category	Grade	Features	Applications
BUF	Low CTE	• Excellent heat resistance and reliability enabled by high‑Tg characteristics • High reliability enabled by low‑CTE characteristics	• FC-BGA (PC CPU/GPU, Automotive MCU/ADAS, DTV Controller)
BUF	Fine Pattern	• Fine‑pattern capability enabled by nano‑filler engineering (L/S ≤ 4/4 µm) • High reliability under high‑temperature and high‑humidity conditions enabled by superior moisture resistance	• FC-BGA(Sever CPU/GPU) • Dielectric material for glass substrates
BUF	Low Dielectric Loss	• Performance optimized for high‑speed signal transmission and low‑loss requirements enabled by low‑Df characteristics • Crack‑suppression capability enabled by controlled elongation and modulus characteristics	• FC-BGA (Sever CPU/GPU, Network IC) • Dielectric material for glass substrates

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If you do not want our company to hold your personal data, you may request that we delete it at any time. The data below shall be kept for the specified period for the reasons listed.

Holding data according to our internal policies - Retained items: Company name, Email, Phone number, Region, type of inquiry, subject, and content - Retention Reason: Preventing service interference and cooperating in the investigations of illegal users - Retention period: 1 years from the date of processing the inquiry

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• to meet the purpose for which you have submitted the information;

• to enable you to be provided with information at a later date which may be of relevance and interest to you based on the nature and purpose of your requests;

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Service Providers	Address	Transferred Personal Data	Data Center
LG CNS, Ltd	Parc1.Tower1, 108, Yeoui-daro Yeongdeungpo-gu, Seoul, 07335, Republic of Korea	Company name, Email, Phone number, Region	Korea

I agree to the Collection/Usage of Personal Information.

1. Personal Data Collected

A. The company collects the following types of personal data to respond to your inquiries and provide consultation.

- Company name, Email, Phone number

B. The data below may be automatically generated or collected when you use the Service.

2. Purposes of Collecting and Using Personal Data

A. LG Chem collects and uses personal data to provide customized services to their customers.

3. Period for Holding and Using Personal Data

If you do not want our company to hold your personal data, you may request that we delete it at any time. The data below shall be kept for the specified period for the reasons listed.

4. Cross-border Transfer

Personal Data collected by LG Chem may be transferred, where it necessary:

• to meet the purpose for which you have submitted the information;

• to enable you to be provided with information at a later date which may be of relevance and interest to you based on the nature and purpose of your requests;

• maintaining our operations or relationship management systems;

• security, quality and risk management reviews; or

• complying with any law and/or regulation.

Service Providers	Address	Transferred Personal Data	Data Center
LG CNS, Ltd	Parc1.Tower1, 108, Yeoui-daro Yeongdeungpo-gu, Seoul, 07335, Republic of Korea	Company name, Email, Phone number, Region	Korea

I agree to the Collection/Usage of Personal Information.

1. Personal Data Collected

A. The company collects the following types of personal data to respond to your inquiries and provide consultation.

- Email, Phone number

B. The data below may be automatically generated or collected when you use the Service.

2. Purposes of Collecting and Using Personal Data

A. LG Chem collects and uses personal data to provide customized services to their customers.

3. Period for Holding and Using Personal Data

If you do not want our company to hold your personal data, you may request that we delete it at any time. The data below shall be kept for the specified period for the reasons listed.

Holding data according to our internal policies - Retained items: Email, Phone number, type of inquiry, subject, and content - Retention Reason: Preventing service interference and cooperating in the investigations of illegal users - Retention period: 1 years from the date of processing the inquiry

4. Cross-border Transfer

Personal Data collected by LG Chem may be transferred, where it necessary:

• to meet the purpose for which you have submitted the information;

• to enable you to be provided with information at a later date which may be of relevance and interest to you based on the nature and purpose of your requests;

• maintaining our operations or relationship management systems;

• security, quality and risk management reviews; or

• complying with any law and/or regulation.

Service Providers	Address	Transferred Personal Data	Data Center
LG CNS, Ltd	Parc1.Tower1, 108, Yeoui-daro Yeongdeungpo-gu, Seoul, 07335, Republic of Korea	Email, Phone number	Korea

I agree to the Collection/Usage of Personal Information.