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For industrial procurement managers, quality engineers, and formulation R&D teams, n-propanol (1-propanol) specification verification is the most critical pre-inspection step before bulk ordering. Unlike general product introductions, this guide focuses entirely on technical procurement standards: measurable physical and chemical indicators, batch testing rules, official document verification, and factory-level quality control mechanisms.

Every indicator listed in this article corresponds to real COA data, incoming inspection standards, and international industrial grading requirements. Buyers can use this document as a direct checklist to verify supplier qualification, avoid substandard batches, and match the correct grade for downstream production.

• CAS Number: 71-23-8 (unique global chemical identification for n-propanol / 1-propanol)
• Molecular Formula: C₃H₈O
• Molecular Weight: 60.10 g/mol
• Common Aliases: 1-Propanol, n-Propyl Alcohol, Propyl Alcohol
• EC Number: 200-746-9

2. Full Official N-Propanol Specification Table (Typical Industrial & High-Purity Standard)

Below is the complete factory-testable specification covering industrial grade, high-purity grade, and ACS reagent grade. All items are mandatory inspection points for incoming quality control (IQC).

3. Detailed Explanation of Key Technical Indicators (Procurer Focus)

Most quality problems of n-propanol in downstream production are caused by out-of-standard individual indicators rather than insufficient nominal purity. The following is the technical procurement interpretation of each core parameter:

3.1 Purity (GC Assay)

Purity is the core grading basis of n-propanol, tested by gas chromatography (GC). Industrial grade requires ≥99.0%, while high-purity and ACS reagent grade require ≥99.5%. Electronic grade can reach ≥99.9% with strictly controlled trace mixed alcohols. Procurers should note that nominal purity cannot represent quality; only GC test data can eliminate isopropanol, methanol and other heterologous alcohol impurities.

3.2 Water Content

Moisture is the most unstable indicator in n-propanol batches. Excessive water content will cause coating whitening, formula demulsification, and failure of pharmaceutical synthesis reactions. Industrial grade allows ≤0.5% water content; high-end fine chemical and electronic scenarios require ≤0.2% or even lower ultra-low moisture standards. All formal batches must provide Karl Fischer test data on COA.

3.3 Color (APHA)

Qualified n-propanol is colorless and transparent. APHA color value exceeding 10 means the product contains oxidized impurities or aged substances, which will affect the color stability of coatings and end products. High-purity grades strictly control APHA ≤5 to ensure no color interference in high-grade formulations.

3.4 Acidity

Excessive acidity will cause corrosion to production equipment and affect the pH balance of adhesives and coatings. Standard n-propanol acidity is calculated as acetic acid. Industrial grade is controlled below 0.005%, and high-purity grade is stricter than 0.003%. Unqualified acidity is the main cause of poor storage stability of finished products.

3.5 Non-Volatile Residue & Impurities

Non-volatile residues refer to solid trace impurities remaining after solvent volatilization, which are fatal defects for electronic precision cleaning and high-purity reagent preparation. Industrial grade residue ≤10 ppm meets conventional cleaning and solvent use; high-purity grade ≤5 ppm is suitable for precision industrial scenarios. Total organic impurities mainly include isopropanol, ethanol and propyl ether, which must be strictly limited for high-standard synthesis processes.

3.6 Density

Density is a fast verification indicator for incoming inspection. The standard density at 20°C is 0.802–0.804 g/cm³. Excessive density usually means high water content or mixed heavy impurities; low density indicates light organic impurities, which can be used as the first screening standard for batch abnormality.

4. What Buyers Must Check on N-Propanol COA (Certificate of Analysis)

COA is the most authoritative batch quality document. Many suppliers provide generic template COA without real batch data. Professional technical procurement must verify the following items one by one to avoid fake reports:

• Unique Batch Number: The batch number on COA must correspond to the outer packaging, shipping list and SDS, with full traceability.
• Actual Test Data, Not Standard Range Only: Qualified COA must list actual tested value of purity, water content, color, acidity and residue, not just standard limits.
• Grade Marking: Clearly mark Industrial Grade / High-Purity / ACS / Electronic Grade to avoid grade mixing and delivery.
• Test Date & Expiry Validity: The test date must match the production date, and long-term expired test reports are invalid.
• Inspector & Factory Stamp: Official manufacturer stamp and inspector signature are required to ensure report authenticity.

Core Judgment Rule: If a COA only displays standard values without actual batch test data, it is a non-qualified report and cannot be used for factory incoming inspection and customs filing.

5. SDS & TDS: Differences and Procurement Usage Scenarios

Focuses on transportation, hazard classification and operation safety. It is a mandatory document for cross-border customs clearance, sea and air transportation. It includes flammability risk, storage temperature, emergency disposal and personal protection guidelines, applicable to logistics and warehouse management verification.

5.1 SDS (Safety Data Sheet)

5.2 TDS (Technical Data Sheet)

Focuses on production and application technical parameters. It summarizes fixed physical properties, application scope, solubility characteristics and formula adaptability of n-propanol, serving as the technical basis for buyers’ process debugging and formula design.

6. Factory Batch Testing & Strict Quality Control Mechanism

Stable n-propanol quality depends on standardized batch testing rather than single-spot inspection. Formal manufacturers implement three-level quality control:

• Raw Material Incoming Inspection: Test the purity and impurity content of propylene and raw alcohol materials to avoid source pollution.
• Online Production Monitoring: Real-time GC monitoring of distillation tower components to ensure stable component proportion during continuous production.
• Finished Batch Full Inspection: Each batch undergoes full-item detection including purity, moisture, acidity, residue and color, with one-to-one COA output.

The core advantage of manufacturer supply is batch-to-batch consistency. Qualified suppliers can ensure that the fluctuation of core indicators between different batches is within 0.1%, completely adapting to buyers’ continuous standardized production.

7. Grade Matching Based on Specification Standards

Different indicator thresholds correspond to completely different application scenarios. Buyers can match grades according to technical parameters:

• N-Propanol Industrial Grade: Purity ≥99.0%, water ≤0.5%, suitable for conventional coatings, inks, industrial cleaning and general chemical synthesis.
• High-Purity N-Propanol: Purity ≥99.5%, low residue and low acidity, suitable for fine chemicals and high-grade solvent formulation.
• N-Propanol ACS Reagent: Meet ACS analytical standards, ultra-stable indicators, suitable for laboratory testing and R&D analysis.
• N-Propanol Electronic Grade: Ultra-low moisture, ultra-low residue, heavy metal free, suitable for electronic precision cleaning and semiconductor auxiliary processes.

Conclusion

Qualified n-propanol procurement is not only based on purity figures, but also comprehensive verification of water content, acidity, color, residue and batch stability. Standard COA, SDS and TDS documents are the basic guarantee for product compliance. Professional buyers should take complete specification indicators and standardized batch quality control as the core evaluation criteria to select matching grades and stable suppliers, so as to eliminate production risks caused by unqualified raw materials.