1. Product Name: Methyl ethyl ketone (2-Butanone), abbreviated as MEK / Butanone

2. Appearance: Colorless transparent liquid, no visible suspended solids, no turbidity, no stratification

3. Key Quality Specifications:

(1) Superior Grade (High-end applications: electronics, precision cleaning, high-end coatings, PU adhesives, pharmaceutical intermediates)

Purity: ≥ 99.5 wt%

Moisture: ≤ 0.05 wt% (500 ppm)

Acidity (as acetic acid): ≤ 0.002 wt%

Color (Pt-Co): ≤ 10 Hazen

Evaporation residue: ≤ 0.001 wt%

Distillation range: 78.5 – 80.5 ℃

（2）Industrial Grade 1 Product (General Purpose: Ordinary Coatings, Inks, Adhesives, Routine Cleaning)

Purity: ≥ 99.0 wt%

Moisture: ≤ 0.10 wt% (1000 ppm)

Acidity (as acetic acid): ≤ 0.003 wt%

Color (Pt-Co): ≤ 15 Hazen

Evaporation residue: ≤ 0.002 wt%

Dilution range: 78.0 – 81.0 ℃

4. Packaging, Transportation & Storage

Sealed packaging, avoid sunlight, high temperature and fire source

Store in a cool, ventilated, explosion-proof warehouse

Prevent moisture and impurities from entering

5. Acceptance Requirements

A Certificate of Assessment (COA) must be provided for each batch. All the above key indicators must be qualified before acceptance. A Certificate of Analysis (COA) shall be provided for each batch; all key indicators must be qualified for acceptance.