Paint chemicals

Butyl acetate is a colorless transparent liquid with pleasant fruity odor. It is more insoluble in water than other lower molecular weight congeners (e.g. methyl ester, ethyl ester, propyl ester, etc.); it is miscible with alcohol, ether, ketone and other organic solvents. Flammable. Acute toxicity is small, in high concentration will cause anesthesia. It has good solubility in ethyl cellulose, cellulose acetate butyrate, polystyrene, methacrylic resin, chlorinated rubber, and many kinds of natural gums. It can be used as cleaning agent or negative photoresist developer in the electronic industry.

Category	Details
Chemical Formula	CH₃COO(CH₂)₃CH₃; ester solvent with low surface tension
Key Applications	– Photoresist Stripping: Post-etch cleaning in semiconductor fabs – Flux Removal: PCB assembly processes – Lens Cleaning: Optical component manufacturing – Adhesive Bonding: Precision electronics assembly
Purity Specifications	– Metals (ppm): Fe <0.1, Na <0.1 – Halides (ppm): Cl⁻ <0.5, SO₄²⁻ <0.5 – Non-volatile Residue: <5mg/kg
Physical Properties	– Boiling Point: 126°C – Flash Point: 33°C (closed cup) – Dielectric Constant: 6.8 @25°C – Evaporation Rate: 2x slower than acetone
Safety Profile	– Flammability: Combustible but not explosive – Health Risks: Mild skin/eye irritation – Exposure Limits: ACGIH TLV 150ppm (TWA)
Environmental Benefits	– VOC Compliance: Meets EU/US regulations – Biodegradability: >90% (OECD 301) – Ozone Depletion: Zero potential
Quality Certifications	– SEMI Standards: SEMI C3.310 (electronic chemicals) – ISO Certifications: ISO 9001, ISO 14001
Market Trends	– Growth Drivers: Advanced packaging technologies, 5G infrastructure – Sustainability Focus: Recycling programs, closed-loop systems – Regional Demand: APAC > Europe > North America

Key Specifications

Purity Requirements

Parameter	Electronic Grade	Industrial Grade
Purity	≥99.99%	≥99.5%
Water Content	≤10 ppm	≤500 ppm
Metal Impurities	≤1 ppb	≤50 ppm
Particle Count	≤5 particles/mL	Not controlled

Physical Properties

Property	Value
Boiling Point	126°C
Flash Point	22°C (CC)
Dielectric Constant	5.01 (20°C)
Surface Tension	25.2 mN/m (20°C)

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Applications in Electronics

Primary Uses

Application	Function	Advantage
Photoresist Composition	Carrier solvent for photoactive compounds	Optimal dissolution balance
Wafer Cleaning	Post-etch residue removal	Low ionic contamination
Display Manufacturing	LCD alignment layer processing	Controlled evaporation rate
Package Assembly	Flux cleaning	Compatible with sensitive components

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Handling & Safety

• Storage: Nitrogen-purged containers, <30°C
• Filtration: 0.1μm membrane filtration before use
• PPE: Chemical goggles, solvent-resistant gloves
• Disposal: Classified as hazardous waste (ignitable)

Quality Control

• GC-MS for organic impurities
• ICP-MS for metal analysis
• Particle counting per SEMI standards

Conclusion

Electronic grade n-butyl acetate meets stringent purity requirements for advanced electronics fabrication. Its consistent performance in critical processes makes it indispensable for semiconductor yield management, with ongoing developments focusing on even lower metal contamination levels.

Note: Preferred for mission-critical electronic cleaning due to ultra-low metallic impurities and residue control. Adoption accelerated by environmental regulations phasing out chlorinated solvents.

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