glycerol

Triol identity evidence

Record evidence identifying propane-1,2,3-triol and distinguish documentary identification from an actual material identity test.

1. Which authoritative records establish the CAS number, PubChem CID and EC number for glycerol? definition
2. Which validated identity test distinguishes this material from propylene glycol, ethylene glycol and other plausible substitutes? measurement

Label to material scope

Record what a supplier means by glycerol or glycerin and whether the record concerns glycerol material, an aqueous preparation or a finished formulation.

1. What composition and grade does the supplier's use of glycerin actually denote? definition
2. Does this record describe glycerol material, or should it link to a formulation, glyceride or other derivative model? boundary

Assay basis and moisture

Record glycerol concentration and water separately, including whether assay is expressed on an as-received or water-free basis.

1. What are the measured glycerol assay and water content, and which methods and reporting bases were used? measurement
2. How was the sample protected from atmospheric moisture between collection and analysis? provenance

Route and use specific impurities

Define the required impurity panel from production provenance and intended use, including investigation of glycol contamination, residual methanol, salts and organic residues where relevant.

1. What results and quantification limits are available for ethylene glycol, diethylene glycol, methanol and other impurities required by the intended specification? measurement
2. Which untested impurities remain plausible given the production route, purification and subsequent handling? provenance

Conditioned phase assessment

Record temperature, composition and thermal history alongside observed phase; do not infer identity or purity solely from whether the material has crystallised.

1. What phase is observed at the recorded temperature and water content, and has the material recently been cooled, warmed or seeded? measurement
2. Which sourced melting, freezing and boiling data apply to this composition and pressure, and how are decomposition observations distinguished? definition

Transfer property envelope

Record density and viscosity at relevant temperatures and composition, together with controls that limit unintended water uptake.

1. What density and dynamic viscosity apply at the intended transfer temperature and measured water content? measurement
2. What warming and container-closure conditions support transfer while keeping the lot within its composition specification? action

Traceable production origin

Record the manufacturer, lot, production route, purification and feedstock declarations at the level supported by documentation.

1. Which manufacturer and lot records establish the production route and purification history? provenance
2. What evidence supports any vegetable, animal, synthetic or other origin claim, including after blending or repackaging? provenance

Documented grade conformity

Separate a marketing grade label from demonstrated conformity to a named specification, edition and application requirement.

1. Which specification, edition and jurisdiction govern glycerol for the proposed use, and which lot results demonstrate conformity? boundary
2. What missing test, certificate or traceability evidence prevents accepting this lot for that use? action

Material-specific hazard record

Associate the lot or composition with an applicable safety data sheet and distinguish liquid contact, aerosol exposure and heated-process exposure.

1. What GHS classification and handling guidance does the current applicable safety data sheet assign to this composition? provenance
2. Are glycerol mist exposure limits applicable in the operating jurisdiction, and what aerosol fraction, units and averaging periods do they specify? measurement

Condition-dependent handling decision

Use documented compatibility and stability evidence to assess moisture ingress, contamination, excessive heating and possible degradation, including acrolein formation under relevant conditions.

1. What temperature, duration, acidity and contact-material conditions are supported by stability evidence, and when is acrolein formation a relevant concern? boundary
2. Which storage excursion, analytical change or contamination event requires retesting, holding or rejecting this glycerol lot? action

Check these first

Recalled without web access and unsourced; every item is a lead to verify.

• This is recalled information, without source consultation.
• Verify current jurisdiction-specific hazard classifications, exposure limits and compendial requirements before operational use.
• Physical properties depend strongly on water content and temperature; commercial grade names alone do not establish composition.

1. Which of these check these first hold for the sense of glycerol this model covers, and on what evidence? provenance

Kinds and varieties

Recalled without web access and unsourced; every item is a lead to verify.

• Crude glycerol from fat processing or biodiesel production
• Refined technical-grade glycerol
• Food-grade glycerol
• Pharmaceutical-grade glycerol
• Anhydrous glycerol

1. Which of these kinds and varieties hold for the sense of glycerol this model covers, and on what evidence? provenance

Identifiers and schemes

Recalled without web access and unsourced; every item is a lead to verify.

• CAS Registry Number - 56-81-5 - Identifies glycerol; does not establish purity or grade.
• PubChem CID - 753 - Compound identifier for glycerol.
• EC number - 200-289-5 - European chemical substance identifier.
• IUPAC nomenclature - propane-1,2,3-triol - Specifies the three hydroxyl groups on the propane skeleton.
• EU food additive E number - E 422 - Food additive identity; not a certification that a particular sample meets food-grade requirements.

1. Which of these identifiers and schemes hold for the sense of glycerol this model covers, and on what evidence? provenance

Standards and regulation

Recalled without web access and unsourced; every item is a lead to verify.

• United States Pharmacopeia-National Formulary: USP Glycerin monograph.
• European Pharmacopoeia, issued by EDQM: glycerol monographs distinguish concentrated and aqueous pharmaceutical materials.
• FAO/WHO Joint Expert Committee on Food Additives: glycerol food additive specifications.

1. Which of these standards and regulation hold for the sense of glycerol this model covers, and on what evidence? provenance

Real-world use

Recalled without web access and unsourced; every item is a lead to verify.

• Humectant in foods, cosmetics and personal-care products.
• Solvent and excipient in pharmaceutical formulations.
• Cryoprotectant for biological samples.
• Plasticizer in polymer and film formulations.
• Chemical feedstock for products including glycerol esters and alkyd resins.

1. Which of these real-world use hold for the sense of glycerol this model covers, and on what evidence? provenance

Typical measurements

Recalled without web access and unsourced; every item is a lead to verify.

• Molar mass - 92.09 - g/mol
• Melting point of pure glycerol - Approximately 18; supercooling can delay crystallization - °C
• Boiling temperature at approximately 101.3 kPa - Approximately 290, with decomposition - °C
• Density of nearly anhydrous glycerol at 20 °C - Approximately 1.26 - g/cm³
• Dynamic viscosity of nearly anhydrous glycerol at 20 °C - Approximately 1.4 - Pa·s

1. Which of these typical measurements hold for the sense of glycerol this model covers, and on what evidence? provenance

Failure modes and hazards

Recalled without web access and unsourced; every item is a lead to verify.

• Severe heating can decompose glycerol and generate acrolein, a strongly irritating toxic substance.
• Glycerol is combustible and can react dangerously with strong oxidizing agents.
• Ethylene glycol or diethylene glycol contamination can make glycerol intended for ingestion dangerously toxic.
• Water absorption changes concentration, viscosity and performance.
• Crude glycerol can contain methanol, salts, soaps and other process impurities that prevent direct food or pharmaceutical use.

1. Which of these failure modes and hazards hold for the sense of glycerol this model covers, and on what evidence? provenance

Regional variation

Recalled without web access and unsourced; every item is a lead to verify.

• Glycerol, glycerin and glycerine are common names; commercial specifications must establish concentration and purity.
• Food additive labeling uses E 422 in the European Union, while other jurisdictions use their own labeling requirements.
• Pharmaceutical acceptance depends on the applicable pharmacopoeia and intended use.

1. Which of these regional variation hold for the sense of glycerol this model covers, and on what evidence? provenance

Neighbouring kinds and how to tell them apart

Recalled without web access and unsourced; every item is a lead to verify.

• Ethylene glycol - A two-carbon diol, rather than a three-carbon triol; it has substantially different toxicity.
• Propylene glycol - Usually propane-1,2-diol, with two hydroxyl groups rather than glycerol's three.
• Triglyceride - Contains glycerol esterified with three fatty acids; it is not free glycerol.
• Glycerol solution - A mixture containing glycerol and a solvent, with concentration-dependent properties.

1. Which of these neighbouring kinds and how to tell them apart hold for the sense of glycerol this model covers, and on what evidence? provenance