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Send EmailStyrene Acrylonitrile, Styrene Acrylo Nitrile, Styrene Acrylonitrile Copolymer, SAN, 9003-54-7
STYRENE ACRYLONITRILE (SAN)
CAS Number: 9003-54-7
EC Number (EINECS): 618-373-4
Molecular Formula: (C₈H₈)ₓ(C₃H₃N)ᵧ
Molecular Weight: Variable (typically 50,000–200,000 g/mol)
Chemical Class: Thermoplastic (amorphous)
SECTION 1: CHEMICAL IDENTITY AND MATERIAL CLASSIFICATION
| Parameter | Description |
|---|---|
| Chemical Name (IUPAC) | Styrene-acrylonitrile copolymer |
| Other Names | SAN, Styrene Acrylonitrile Copolymer, SAN Resin |
| CAS Number | 9003-54-7 |
| EC Number (EINECS) | 618-373-4 |
| Molecular Formula | (C₈H₈)ₓ(C₃H₃N)ᵧ |
| Molecular Weight | Variable (typically 50,000–200,000 g/mol) |
| Chemical Class | Thermoplastic (amorphous) |
| Structure | Random copolymer of styrene and acrylonitrile |
| Appearance | Transparent, water-clear to slightly yellowish pellets |
| Odor | Slight characteristic |
SECTION 2: TYPICAL COMPOSITION
| Monomer | Typical Content | Function |
|---|---|---|
| Styrene (S) | 60–80% | Processability, surface gloss, rigidity |
| Acrylonitrile (AN) | 20–40% | Chemical resistance, heat resistance, stiffness |
SECTION 3: PHYSICAL AND CHEMICAL PROPERTIES
| Property | Value / Range |
|---|---|
| Density | 1.04–1.08 g/cm³ |
| Glass Transition Temp (Tg) | 100–110°C |
| Melting Point | 200–240°C (processing temperature) |
| Vicat Softening Point | 100–110°C |
| Heat Deflection Temp (HDT) | 85–105°C (at 1.82 MPa) |
| Max. Continuous Service Temp | 80–95°C |
| Min. Service Temp | -20°C to -10°C |
| Coefficient of Thermal Expansion | 60–80 × 10⁻⁶ /K |
| Thermal Conductivity | 0.15–0.20 W/(m·K) |
| Specific Heat | 1.2–1.4 kJ/(kg·K) |
| Water Absorption (24h) | 0.2–0.4% |
| Solubility in Water | Insoluble |
| Solubility in Organic Solvents | Soluble in MEK, acetone, DMF, THF |
| Refractive Index | 1.57–1.59 |
| Light Transmission | 85–90% |
| Dielectric Constant (1 MHz) | 2.8–3.2 |
| Dielectric Strength | 15–20 kV/mm |
| Volume Resistivity | 10¹⁴–10¹⁶ Ω·cm |
| Surface Resistivity | 10¹³–10¹⁵ Ω |
SECTION 4: MECHANICAL PROPERTIES
| Property | Value / Range |
|---|---|
| Tensile Strength | 60–80 MPa |
| Tensile Modulus | 2.5–3.5 GPa |
| Elongation at Break | 2–4% |
| Flexural Strength | 80–110 MPa |
| Flexural Modulus | 2.5–3.5 GPa |
| Izod Impact Strength (Notched) | 1–3 kJ/m² |
| Charpy Impact Strength (Notched) | 1–2 kJ/m² |
| Hardness (Rockwell R) | 100–120 |
| Hardness (Shore D) | 75–85 |
SECTION 5: CHEMICAL RESISTANCE
| Chemical | Resistance at Room Temp |
|---|---|
| Acids (Dilute) | Good to excellent |
| Acids (Concentrated) | Moderate |
| Alkalies | Good |
| Alcohols | Good (aliphatic) |
| Aliphatic Hydrocarbons | Good |
| Aromatic Hydrocarbons | Poor (dissolves) |
| Chlorinated Solvents | Poor (dissolves) |
| Ketones | Poor (dissolves) |
| Esters | Poor (dissolves) |
| Oils and Greases | Good |
| Water | Excellent |
SECTION 6: MAJOR APPLICATIONS AND END-USES
6.1. Household Goods (25–30%)
| Application | Advantages |
|---|---|
| Dishwasher-Safe Containers | Heat resistance, clarity, durability |
| Disposable Lighters | Clarity, impact resistance, cost |
| Brush Bristles | Stiffness, durability |
| Kitchenware | Clarity, heat resistance, food contact |
| Bathroom Accessories | Water resistance, clarity |
6.2. Automotive (15–20%)
| Application | Advantages |
|---|---|
| Instrument Cluster Covers | Clarity, heat resistance, UV stability |
| Reflectors | Clarity, dimensional stability, heat resistance |
| Interior Trim | Aesthetics, durability, heat resistance |
| Switch Components | Dimensional stability, electrical insulation |
6.3. Electronics (15–20%)
| Application | Advantages |
|---|---|
| Battery Cases | Chemical resistance, dimensional stability |
| Refrigerator Doors | Clarity, impact resistance, aesthetics |
| Electrical Housings | Flame retardancy, dimensional stability |
| TV Components | Clarity, heat resistance, aesthetics |
6.4. Cosmetics and Personal Care (10–15%)
| Application | Advantages |
|---|---|
| Cosmetic Containers | Clarity, chemical resistance, aesthetics |
| Perfume Bottles | Clarity, chemical resistance |
| Makeup Cases | Clarity, durability, aesthetics |
6.5. Medical (5–10%)
| Application | Advantages |
|---|---|
| Medical Syringes | Clarity, sterilization, dimensional stability |
| Medical Device Housings | Clarity, sterilization, chemical resistance |
| Lab Equipment | Clarity, chemical resistance, dimensional stability |
6.6. Other Applications (15–20%)
| Application | Advantages |
|---|---|
| Office Equipment | Dimensional stability, aesthetics |
| Food Packaging | Clarity, food contact, heat resistance |
| Stationery | Clarity, stiffness |
| Lighting Fixtures | Clarity, heat resistance, UV stability |
SECTION 7: SAN vs POLYSTYRENE (PS) COMPARISON
| Property | SAN | GPPS |
|---|---|---|
| Heat Deflection Temp (°C) | 85–105 | 70–95 |
| Chemical Resistance | Excellent | Poor |
| Tensile Strength (MPa) | 60–80 | 35–60 |
| Impact Resistance (kJ/m²) | 1–3 | 1–2 |
| Hardness (Rockwell R) | 100–120 | 100–120 |
| Transparency | High (85–90%) | High (90%) |
| Cost | Higher | Lower |
| Applications | Heat-resistant, chemical-resistant | General purpose |
SECTION 8: ADVANTAGES AND DISADVANTAGES
8.1. Advantages
| Advantage | Description |
|---|---|
| Excellent Transparency | Water-clear clarity (85–90% light transmission) |
| High Heat Resistance | HDT 85–105°C, Vicat 100–110°C |
| Excellent Chemical Resistance | Good resistance to acids, alkalis, oils, and aliphatic hydrocarbons |
| High Tensile Strength | 60–80 MPa |
| Good Processability | Easy injection molding and extrusion |
| Dimensional Stability | Low mold shrinkage, good accuracy |
| Food Contact | FDA approved for food contact |
| UV Stability | Better than ABS and PS |
8.2. Disadvantages
| Disadvantage | Description |
|---|---|
| Brittleness | Low impact resistance |
| Poor Solvent Resistance | Dissolves in ketones, esters, and aromatic solvents |
| Higher Cost | More expensive than GPPS |
| Lower Impact Strength | Not suitable for high-impact applications |
SECTION 9: PROCESSING METHODS
| Method | Temperature Range | Applications |
|---|---|---|
| Injection Molding | 200–260°C | Containers, housings, covers |
| Extrusion | 190–250°C | Sheets, films, profiles |
| Blow Molding | 190–230°C | Bottles, containers |
| Thermoforming | 140–200°C | Packaging, trays |
9.1. Drying Requirements
| Parameter | Value |
|---|---|
| Drying Temperature | 80–90°C |
| Drying Time | 2–4 hours |
| Residual Moisture | <0.1% |
SECTION 10: TOXICOLOGY AND SAFETY
| Parameter | Value / Description |
|---|---|
| GHS Classification | Not classified |
| Oral LD₅₀ (Rat) | >5,000 mg/kg (very low toxicity) |
| Skin Irritation | Not irritating |
| Eye Irritation | Mild irritant (dust) |
| Inhalation (Dust) | May cause mechanical irritation |
| Thermal Decomposition | >250°C releases styrene and acrylonitrile monomers |
| Combustion Products | CO, CO₂, HCN, NOₓ |
| Biodegradability | Not biodegradable |
| Recyclability | Yes (mechanical recycling) |
SECTION 11: ENVIRONMENTAL ASPECTS
| Parameter | Value |
|---|---|
| Biodegradability | Not biodegradable |
| Recyclability | Yes (mechanical recycling) |
| Combustion Products | CO, CO₂, HCN, NOₓ |
| Marine Environment | Contributes to microplastic pollution |
SECTION 12: STORAGE AND SHELF LIFE
Storage Conditions:
-
Cool, dry, well-ventilated area
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Protect from direct sunlight (UV degradation)
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Keep away from heat sources and flames
-
Protect from moisture (hygroscopic)
Shelf Life: 12–24 months (in cool, dry storage)
Degradation Indicators:
-
Color change (yellowing)
-
Surface defects
-
Reduced mechanical properties
SECTION 13: TRANSPORT INFORMATION
| Parameter | Information |
|---|---|
| UN Number | Not regulated |
| Hazard Class | Not classified as dangerous goods |
| Proper Shipping Name | Styrene Acrylonitrile (SAN) |
| ADR/RID | Not regulated |
| IMDG | Not regulated |
| IATA | Not regulated |
| Dust Explosion Hazard | Fine dust suspended in air can be explosive |
SECTION 14: SYNONYMS AND COMMON NAMES
| Type | Names |
|---|---|
| Turkish | Stiren Akrilonitril, SAN, Stiren Akrilonitril Kopolimeri |
| English | Styrene Acrylonitrile, SAN, Styrene Acrylonitrile Copolymer |
| Trade Names | Luran, Tyril, Lustran, SAN |
| Recycling Code | #7 (Other) |
SECTION 15: REGULATORY STATUS
| Regulation | Status |
|---|---|
| REACH (EU) | Registered |
| TSCA (USA) | Listed |
| FDA (USA) | Food contact approved (21 CFR 177.1040) |
| EU Food Contact (10/2011) | Permitted |
| RoHS | Compliant |
| California Prop 65 | Not listed |
| Conflict Minerals | Not applicable |
SECTION 16: SUMMARY AND CRITICAL WARNINGS
Product Summary
| Parameter | Value |
|---|---|
| Product | Styrene Acrylonitrile (SAN) |
| CAS | 9003-54-7 |
| Appearance | Transparent, water-clear pellets |
| Density | 1.04–1.08 g/cm³ |
| Key Properties | Transparency, heat resistance, chemical resistance |
| Key Industries | Household, automotive, electronics |
CRITICAL WARNINGS
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Excellent Transparency: SAN provides water-clear clarity with 85–90% light transmission, making it ideal for transparent applications requiring heat resistance.
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Superior to Polystyrene: Compared to GPPS, SAN offers much better chemical resistance, improved heat stability, higher tensile strength, and a higher heat deflection temperature.
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Heat Resistance: HDT 85–105°C and Vicat softening point 100–110°C, making it suitable for dishwasher-safe applications.
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Chemical Resistance: Excellent resistance to acids, alkalis, oils, and aliphatic hydrocarbons. Poor resistance to ketones, esters, and aromatic solvents.
-
Brittleness: Similar to PS, SAN is brittle with low impact resistance. Not suitable for high-impact applications.
-
Food Contact: Approved for food contact under FDA 21 CFR 177.1040. Safe for use in food packaging and containers.
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Drying Required: SAN is hygroscopic and must be dried before processing (80–90°C, 2–4 hours) to prevent surface defects.
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Recyclable: Fully recyclable. Recycling code: #7 (Other).
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Higher Cost: More expensive than GPPS but offers superior properties.
-
Regulatory Status: REACH, TSCA, and FDA compliant.
IMPORTANT DISCLAIMER: This Technical Data Sheet (TDS) is for informational purposes only and is based on available technical data. The user is solely responsible for determining the product's suitability for their specific application and for complying with all applicable local, national, and international regulations. For complete safety, storage, handling, transportation, disposal, and regulatory compliance information, always refer to the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier. Users are responsible for testing the product in their own processes and applications. All local, national, and international regulations must be followed when working with SAN.
