PURANOL G 304

Puranol G 304 is used as a polyol component in polyurethane systems (e.g., elastomers, adhesives, sealants, coatings, some non-cellular PU systems).
Puranol G 304 is used for transportation components, coatings and dyes, adhesives/sealants, molded urethane parts, some foam and elastomer formulations (depending on exact grade and formulation).

CAS number: No unique CAS well-documented for “Puranol G 304” (trade name). 
If forced to pick a generic polyether polyol reference, some sources mention 9003-11-6 for polyether polyols in general. 
EC number: Not found for this specific grade/trade name.
Molecular formula: Not available (because mixture; chain lengths vary).
Molecular weight: Nominal ~450 g·mol⁻¹ is quoted for the G304F grade.

SYNONYMS:
Puranol G 304, Puranol G-304, Puranol G 304F, Puranol G-304F, Puranol G304, Puranol G304F, CASE polyether polyol, trifunctional polyether polyol

Puranol G 304 is a trade name / commercial grade — vendors provide technical data (TDS) and safety data (SDS) for the product.
From a physical standpoint, Puranol G 304 behaves like a typical low-to-medium molecular weight polyether polyol: it is hygroscopic, slowly absorbing moisture from air, which can interfere with isocyanate reactions if not properly managed.

Therefore, storage conditions of Puranol G 304 require airtight containers, dry environments, and avoidance of prolonged exposure to elevated temperatures.
Puranol G 304 is chemically stable under normal storage conditions but may degrade if exposed to strong oxidising agents, strong acids, or prolonged heat.

Regulatory documentation for Puranol G 304 usually provides information on its status under EU REACH, GHS, and transportation regulations.
As a polyether polyol, Puranol G 304 is typically not classified as dangerous for transport, and it does not fall under flammable liquid classifications at normal operating conditions due to its high flash point and low volatility.

Environmental considerations generally describe Puranol G 304 as having low bioaccumulation potential, low aquatic toxicity, and slow biodegradability consistent with polyether structures.
Any regulatory identifiers that appear in documentation often refer to generic polyether polyol categories rather than the Puranol G 304 grade itself.

USES and APPLICATIONS of PURANOL G 304:
In modern polyurethane chemistry, Puranol G 304 is valued for its predictable behaviour, reproducible quality, and formulation versatility.
Manufacturers may choose this grade when they need a balanced Puranol G 304 that supports strong crosslinking without sacrificing flexibility, or when developing products that must withstand mechanical strain, vibration, or environmental exposure.

Its typical performance profile positions Puranol G 304 as a reliable polyol for demanding industrial applications, especially in sectors such as automotive manufacturing, industrial maintenance, construction materials, and specialty coatings.
In industrial processing, Puranol G 304 offers several performance advantages.

Puranol G 304's controlled molecular weight distribution supports consistent viscosity and reactivity, which is valuable for automated dispensing and precise stoichiometric control.
Puranol G 304's compatibility with a broad range of isocyanates gives formulators flexibility in designing soft, medium, or rigid polymer systems.

In adhesives and sealants, Puranol G 304 contributes to tack, cohesive strength, elasticity, and improved resistance to humidity and chemical exposure.
In elastomer applications, Puranol G 304  enhances elongation, tear resistance, and resilience, especially when paired with an MDI-rich system.

Its low colour index also makes Puranol G 304 suitable for coatings where clarity or colour stability is important.
Puranol G 304 is a commercial polyether polyol designed for CASE applications, meaning it is commonly used in Coatings, Adhesives, Sealants, and Elastomers.

Puranol G 304 is not a single, pure chemical substance but rather a carefully controlled polymeric mixture produced by the catalytic polymerisation of propylene oxide and/or ethylene oxide on a multifunctional starter, normally yielding a trifunctional polyether backbone.
Because of this polymeric nature and batch-dependent distribution, Puranol G 304 does not carry a unique CAS or EC number of its own.

Instead, suppliers identify Puranol G 304 through a technical data sheet and safety data sheet that describe its hydroxyl value, nominal molecular weight, functionality, and performance characteristics.
Puranol G 304 is typically supplied as a clear to slightly yellow viscous liquid, with a relatively low colour index, demonstrating consistent reactivity with common isocyanates such as TDI, MDI, and modified MDI prepolymers.

In polyurethane systems, Puranol G 304 plays an essential structural role.
Puranol G 304's trifunctional nature enables the formation of a three-dimensional polymer network, giving final products improved mechanical strength, flexibility, adhesion, and durability.

The typical nominal molecular weight of around 450 g/mol allows for balanced processing behaviour: low enough to maintain good reactivity and high enough to avoid excessive brittleness in the end product.
Puranol G 304’s hydroxyl value, commonly reported in the mid-to-high 300 mg KOH/g range, ensures predictable cure profiles in one-component and two-component polyurethane formulations.

This makes Puranol G 304 a preferred choice in high-performance elastomers, sealants exposed to dynamic stress, reactive adhesives, and industrial floor coatings where controlled crosslink density is crucial.

Primary use: Puranol G 304 is used as a polyol component in polyurethane systems (e.g., elastomers, adhesives, sealants, coatings, some non-cellular PU systems).
Typical application areas of Puranol G 304: transportation components, coatings and dyes, adhesives/sealants, molded urethane parts, some foam and elastomer formulations (depending on exact grade and formulation).

BENEFITS / PERFORMANCE CHARACTERISTICS of PURANOL G 304:
Trifunctional backbone provides crosslinking sites useful for elastomers/coatings/adhesives.
Relatively narrow molecular weight distribution (in many commercial batches) which helps predictable reactivity and mechanical properties.
Good processability in commercial polyurethane formulations when paired with appropriate catalysts and isocyanates.

PHYSICAL and CHEMICAL PROPERTIES of PURANOL G 304:
Functionality: ~3 (trifunctional polyether polyol)
Hydroxyl Value (OH Value): ~360–380 mg KOH/g (reported range for G304F grade)
Nominal Number-Average Molecular Weight (Mn): ~450 g·mol⁻¹
Colour / Appearance: viscous liquid, typically APHA/colour ≤50 (light-colored to pale yellow viscous liquid)
Viscosity / Density: Viscous liquid (specific viscosity varies by exact grade and temperature — consult technical datasheet for precise viscosity at 25 °C); density is grade-dependent (typical polyether polyol densities ~1.0–1.1 g·cm⁻³)
Solubility: miscible with many organic solvents used in polyurethanes; 
practically insoluble in water as a discrete phase 
(but can be partly miscible depending on formulation and hydroxyl content)

Stability / Reactivity: reactive toward isocyanates (–OH groups react to form urethane linkages); 
stable under normal storage if kept dry and protected from strong acids/bases and high temperatures
Physical State & Appearance: Liquid, viscous; likely pale / light-coloured (polyether polyols are often “clear to slightly yellow” in technical-grade form)
Functionality (Nominal): ~3 (i.e., tri-functional polyol) — consistent with other G-series polyether polyols
Hydroxyl Value (OH Number) Note: G 304F grade’s OH value may differ from related G-series grades (~420–480 mg KOH/g), but comparable

Molecular Weight / Average MW: narrow molecular-weight distribution; 
similar G-series polyols have MW around a few hundred g/mol for tri-functional polyols
Viscosity: likely moderately viscous liquid; comparable G-series polyols have viscosity at 25 °C of 500–800 mPa·s
Water Content / Moisture: typically very low (<0.1 %) to minimize side reactions in polyurethane formulations
Acid / Acid Value: low acid value typical for CASE polyether polyols
Reactivity / Chemical Behavior: polyether polyol (triol) reacts with isocyanates to form polyurethane; stable under normal ambient storage; hygroscopic; degrade under strong oxidative conditions, high temperature, or strong acids/bases

Solubility: miscible with many organic solvents used in polyurethane chemistry; 
limited water solubility
Thermal / Flammability: specific thermal properties not publicly documented; 
flash point likely relatively high; typically stable under recommended storage
Density (Specific Gravity): typical polyether triols ~1.00–1.05 g/cm³; example SDS gives ~1.02 g/cm³ at 20 °C
Hazards / Reactivity: reacts exothermically with di-isocyanates;
low volatility (low vapor pressure at ambient temperature)

FIRST AID MEASURES of PURANOL G 304:
-Description of first-aid measures
*General advice:
Show this material safety data sheet to the doctor in attendance.
*If inhaled:
After inhalation: 
Fresh air.
*In case of skin contact: 
Take off immediately all contaminated clothing. 
Rinse skin with
water/ shower.
*In case of eye contact:
After eye contact: 
Rinse out with plenty of water. 
Call in ophthalmologist. 
Remove contact lenses.
*If swallowed:
After swallowing: 
Immediately make victim drink water (two glasses at most). 
Consult a physician.
-Indication of any immediate medical attention and special treatment needed.
No data available

ACCIDENTAL RELEASE MEASURES of PURANOL G 304:
-Environmental precautions:
Do not let product enter drains.
-Methods and materials for containment and cleaning up:
Cover drains. 
Collect, bind, and pump off spills. 
Observe possible material restrictions. 
Take up dry. 
Dispose of properly. 
Clean up affected area.

FIRE FIGHTING MEASURES of PURANOL G 304:
-Extinguishing media:
*Suitable extinguishing media:
Carbon dioxide (CO2) 
Foam 
Dry powder
*Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.
-Further information:
Prevent fire extinguishing water from contaminating surface water or the ground water system.

EXPOSURE CONTROLS/PERSONAL PROTECTION of PURANOL G 304:
-Control parameters:
--Ingredients with workplace control parameters:
-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use equipment for eye protection. 
Safety glasses
*Body Protection:
protective clothing
*Respiratory protection:
Recommended Filter type: Filter A 
-Control of environmental exposure:
Do not let product enter drains. 

HANDLING and STORAGE of PURANOL G 304:
-Conditions for safe storage, including any incompatibilities:
*Storage conditions:
Tightly closed. 
Dry.

STABILITY and REACTIVITY of PURANOL G 304:
-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature).
-Possibility of hazardous reactions:
No data available