ISO 21093:2003

Overview

ISO 21093:2003 is an international standard that specifies quality characteristics for oil of dwarf pine (Pinus mugo Turra) obtained by steam distillation of fresh or partially dried branches. Its purpose is to provide clear, reproducible criteria for assessing the identity and quality of this essential oil, supporting testing, trade and regulatory compliance.

Key topics and technical requirements

The standard defines physical, chemical and chromatographic criteria used in quality assessment:

• Botanical source: Oil from Pinus mugo Turra (Pinaceae), steam distilled from branches.
• Appearance and odor: Mobile, clear liquid; color: incolore (colorless); odor: characteristic, slightly greasy, turpentine-like.
• Physicochemical limits:
  • Density (20 °C): 0.858 – 0.868
  • Refractive index (20 °C): 1.4740 – 1.4780
  • Optical rotation (20 °C): –7° to –15°
  • Acid value (indice d’acide): max 1.0
  • Peroxide value: max 20 mmol/kg
  • Miscibility with 90% ethanol (20 °C): clear solution using ≤ 10 volumes ethanol per 1 volume oil
• Chromatographic profile (GC): Normative GC fingerprint with percentage ranges for key constituents (examples):
  • α-Pinene: 10–30%
  • β-Pinene: 3–14%
  • δ-3-Carene: 5–25%
  • Limonene: 8–14%
  • Myrcene, terpinolene, bornyl acetate, β-phellandrene, β-caryophyllene and others with specified ranges
    The GC profile is normative; Annex A provides typical chromatograms and example GC operating conditions.
• Sampling and sample size: Referenced ISO 212; minimum sample volume for testing is 50 ml.
• Flash point: Informative average value given as +42 °C (method and device noted).

Applications and users

ISO 21093 is used for:

• Quality control in essential oil production and botanical extraction facilities.
• Specification and acceptance testing for cosmetics, aromatherapy, perfumery, food flavoring, and pharmaceutical ingredients.
• Laboratory method development and verification of GC fingerprinting for identity testing.
• Procurement, import/export documentation and insurance/transport safety assessments (flash point information). Primary users: QC chemists, analytical laboratories, manufacturers, formulators, regulatory bodies, traders and transport/insurance professionals handling essential oils.

Related standards

ISO 21093 references several complementary ISO documents that define test methods, sampling and packaging:

• ISO 212 (sampling), ISO 279 (density), ISO 280 (refractive index), ISO 592 (optical rotation), ISO 875 (ethanol miscibility), ISO 1242 (acid value), ISO 3960 (peroxide), ISO 11024‑1/2 (GC profile guidance), ISO/TR 11018 (flash point guidance), ISO/TR 210/211 (packaging/labeling).

Keywords: ISO 21093, oil of dwarf pine, Pinus mugo, essential oil standard, GC profile, quality assessment, physicochemical specifications, density, refractive index, optical rotation, peroxide value, acid value, sampling.