PET BG845
| Product Name | Polyethylene Terephthalate — PET BG845 |
|---|---|
| Chemical Family / Formula | Thermoplastic Polyester — (C₁₀H₈O₄)n |
| Grade | 845 (Bottle Grade — High IV) |
| Physical Appearance | Transparent crystalline chips / granules — High purity |
| Origin Complex Producer | Shahid Tondgooyan Petrochemical Company |
| Packaging Type | Standard 25 kg multi-layer moisture-barrier bags (Palletized) |
| Supplier | MizanPetroGas |
| Contact | 09155118932 (Direct WhatsApp Contact) |
- Description
Description
Polyethylene Terephthalate Grade 845 (PET BG845) – Bottle Grade
High-clarity thermoplastic polyester with the highest intrinsic viscosity in the bottle-grade portfolio – Prime choice for ultra-large containers, industrial carboys, and heavy-duty bottles | Produced by Shahid Tondgooyan Petrochemical | Supplier: MizanPetroGas
Product Introduction
Polyethylene Terephthalate Grade 845 (PET BG845) is the premium bottle grade within the product portfolio of Shahid Tondgooyan Petrochemical Company. Formulated with the highest Intrinsic Viscosity (IV) among standard commercial bottle grades, it is specifically engineered for producing ultra-large plastic containers, industrial carboys, 5-to-20-liter water bottles, and wide-mouth jars requiring exceptional mechanical strength. Produced via advanced Solid State Polymerization (SSP) technology, this grade exhibits extended polymer chain lengths, translating directly to superior mechanical strength, outstanding creep resistance, and extended structural durability in blow-molded containers.
PET is a thermoplastic polyester with the repeating molecular formula $(C_{10}H_8O_4)_n$, synthesized via the condensation polymerization of pure terephthalic acid (PTA) and monoethylene glycol (MEG). Grade 845 represents the pinnacle of polymer engineering in the PET bottle family: polymer chain lengths are maximized to deliver exceptional mechanical properties, crystalline optical clarity, and robust processing stability. MizanPetroGas Company supplies this strategic polymer with full quality assurance, guaranteed authenticity, and verified manufacturer Certificates of Analysis (COA).
MizanPetroGas | 09155118932 | sell@mizanpetrogas.com
Pricing and Purchasing PET BG845
The commercial pricing of PET Bottle Grade 845 is primarily determined by global feedstock prices for PTA and MEG, foreign exchange dynamics, seasonal demand cycles across the packaging sector, and producer allocation policies. MizanPetroGas streamlines material procurement for converting operations. For real-time pricing inquiries, verified technical datasheets, and immediate inventory dispatch, please contact our polymer sales specialists.
Chemical Structure and Manufacturing Process
PET is produced through the condensation reaction of two primary feedstocks: Purified Terephthalic Acid (PTA) and Monoethylene Glycol (MEG). The production cycle at Shahid Tondgooyan Petrochemical includes the following stages:
PET BG845 Production Steps at Shahid Tondgooyan Petrochemical
- Esterification Reaction: PTA and MEG react at elevated temperatures (240–260°C) to produce bis(2-hydroxyethyl) terephthalate (BHET) monomer with water as a condensation by-product.
- Melt Polymerization: BHET undergoes polycondensation under high temperature (270–290°C) and high vacuum to yield amorphous PET with a baseline intrinsic viscosity ($IV \approx 0.60–0.64\text{ dL/g}$).
- Solid State Polymerization (SSP) – Extended Phase: Amorphous PET chips are subjected to temperatures below their melting point (200–220°C) under high vacuum or inert gas ($N_2$) flow for an extended residence time to increase the intrinsic viscosity to the highest range in the bottle-grade class (0.84–0.88 dL/g). This step simultaneously strips out residual acetaldehyde (AA).
- Final Crystallization & Packaging: The polymer chips undergo final crystallization and are packed into standard 25 kg multi-layer moisture-barrier bags.
Why PET BG845? – Peak Performance in Bottle Grades
Grade 845 is the most premium member of the bottle-grade PET portfolio. It is tailored for converters with stringent technical requirements where finished containers must withstand maximum mechanical stress, high hydrostatic pressure, and prolonged top-load forces. The elevated IV translates directly into extended polymer chains, higher molecular entanglement, and superior physical properties across all performance vectors.
Highest Bottle-Grade IV
Intrinsic viscosity of 0.84 to 0.88 dL/g provides extended polymer chain architecture, delivering unmatched tensile strength, creep resistance, and impact toughness.
Engineered for Heavy Containers
Optimized for blowing 5 to 20-liter water carboys, large industrial containers, and thick-walled bottles subjected to heavy contents and stacking loads.
Crystal Clarity & Gloss
Transparent crystalline granules yield blow-molded bottles with exceptional clarity, low haze, and a brilliant surface finish that enhances shelf appeal.
Key Features
- Highest Intrinsic Viscosity (IV: 0.84–0.88 dL/g)
- Crystal-Clear Transparency and High Surface Gloss
- Outstanding Tensile Strength
- Superior Creep Resistance
- High Impact and Drop Resistance
- Effective Barrier Properties Against $CO_2$ and $O_2$
- Excellent Processability in ISBM and EBM
- High Thermal Stability (up to 285°C)
- Low Specific Gravity (1.38–1.40 g/cm³)
- Zero Taste and Odor Residuals in Finished Containers
- Food-Contact Compliant (FDA & EFSA Food Grade)
- Controlled Low Acetaldehyde Content (Low AA)
- Chemical Resistance to Dilute Acids and Alkalis
- 100% Recyclable Thermoplastic Polymer
- Uniform Molecular Weight Distribution
- Optimized for Ultra-Large Bottles and Industrial Carboys
Key Advantages
Unrivaled Mechanical Strength
The highest IV in bottle grades ensures longer polymer chains and high molecular entanglement, preventing environmental stress cracking (ESCR) and wall fatigue.
Built for Large-Volume Packaging
Engineered for 5-to-20-liter water carboys, edible oil jugs, and chemical containers where liquid mass and transport stresses demand high melt strength.
Exceptional Optical Clarity
Produces brilliant, water-clear bottles that highlight product purity — a crucial marketing asset for consumer-facing brands.
Long-Term Dimensional Stability
High creep resistance ensures bottles retain their shape and structural integrity during extended storage, heavy palletization, and temperature fluctuations.
Certified Food Contact Safety
Fully compliant with FDA, EFSA, and national food-contact regulations, with non-detectable harmful monomer or additive migration.
Lightweighting Potential
Higher mechanical properties allow converters to reduce wall thickness while maintaining rigidity, lowering raw material consumption and per-unit production costs.
Applications and Target Industries
Ultra-Large Bottles & Industrial Carboys
5 to 20-Liter Water Carboys
Production of heavy-duty 5-gallon water dispenser carboys and 5–10L water bottles requiring high drop resistance and robust stacking strength.
Large Edible Oil Containers
Bulk packaging for edible oils (5–20L) offering chemical resistance to fatty acids and oxygen barrier protection against oxidative rancidity.
Industrial Wide-Mouth Jars
Molding of large-format wide-mouth jars and chemical bottles for non-corrosive liquids, institutional detergents, and hygiene products.
Food & Beverage Packaging
Large Beverage Bottles
Bottling still beverages and juices in 2-to-5-liter formats with high clarity and sufficient tensile strength to withstand transport pressures.
Condiment & Sauce Containers
Commercial packaging for ketchups, dressings, and culinary sauces resistant to acetic and organic acids, preserving flavor and aroma.
Bulk Dry Food Jars
Rigid, clear jars for dried fruits, nuts, grains, and confectionery providing moisture barrier properties to maintain product freshness.
Pharmaceutical, Cosmetic & Household Chemical Packaging
Bulk Pharmaceutical Containers
Large-volume syrup and liquid supplement bottles meeting stringent pharmacopeial cleanliness standards and chemical non-reactivity.
Cosmetics & Personal Care
Economy-size bottles for shampoos, lotions, and body washes combining premium surface gloss with resistance to surfactant stress cracking.
Household Cleaner Bottles
Rigid packaging for liquid detergents, multi-surface cleaners, and household products requiring alkaline resistance.
Typical Technical Specifications – PET BG845
| No. | Property | Typical Value | Unit | Test Method |
|---|---|---|---|---|
| 1 | Intrinsic Viscosity (IV) | 0.84 – 0.88 | dL/g | ASTM D4603 |
| 2 | Acetaldehyde Content (AA) | < 1.5 | ppm | ASTM D4526 (HS-GC) |
| 3 | Diethylene Glycol (DEG) Content | 1.0 – 1.5 | wt % | ASTM D4603 |
| 4 | Melting Point ($T_m$) | 245 – 255 | °C | ASTM D3418 (DSC) |
| 5 | Glass Transition Temperature ($T_g$) | 75 – 80 | °C | ASTM D3418 (DSC) |
| 6 | Density | 1.38 – 1.40 | g/cm³ | ASTM D1505 / D792 |
| 7 | Moisture Content | < 0.4 | wt % | ASTM D4019 (KF) |
| 8 | Carboxyl End Groups (–COOH) | < 30 | mmol/kg | ASTM D7409 |
| 9 | Crystallinity | 50 – 55 | % | ASTM D3418 (DSC) |
| 10 | Bottle Clarity (Haze) | < 3.5 | % Haze | ASTM D1003 |
| 11 | Color Value ($b^*$) | < 1.2 | — | CIE Lab (HunterLab) |
| 12 | Melt Flow Rate (MFR)* | Available upon inquiry | g/10min | ASTM D1238 |
| 13 | Physical Appearance | Transparent crystalline chips | — | Visual |
| 14 | Granule Dimensions | 2.5–3.5 (Dia) × 2.5–3.5 (Length) | mm | Standard Sieve |
| 15 | Packaging | 25 kg bags – 40 bags per pallet (1,000 kg) | — | — |
| 16 | Manufacturer | Shahid Tondgooyan Petrochemical Company | — | — |
⚠️ Notice: The values listed above represent typical properties based on standard Shahid Tondgooyan Petrochemical analyses. For consignment-specific Certificates of Analysis (COA), please contact the technical department of MizanPetroGas.
Performance Rating Overview
| Intrinsic Viscosity (IV) — Class Maximum | Maximum | |
| Tensile Strength | Exceptional | |
| Creep Resistance | Exceptional | |
| Impact Resistance | Excellent | |
| Optical Clarity | Very Good | |
| $CO_2$ Barrier Performance | Good | |
| Low Acetaldehyde (Low AA) | Very Good | |
| Food Grade Compliance | Fully Certified | |
| Lightweighting Potential | Excellent | |
| Recyclability | 100% | |
| Supply Reliability | Guaranteed |
Handling, Dehumidifying & Processing Guidelines
- Hygroscopic Sensitivity: PET is naturally hygroscopic. Absorbed moisture exceeding 0.004% (40 ppm) causes hydrolytic degradation of the polymer backbone during melt extrusion, triggering significant IV loss, reduced mechanical toughness, and bubble defects.
- Mandatory Pre-Drying: Chips must be dried prior to injection at 160–170°C for 4 to 6 hours to achieve moisture levels below 30 ppm. Use desiccant dehumidifying dryers with an operating dew point $\leq -40\text{°C}$.
- Injection Processing Temperature: 270–290°C (avoid temperatures above 295°C to prevent thermal degradation, AA formation, and yellowing).
- Preform Mold Chilling: 6–15°C (cold mold for rapid quenching to maintain amorphous clarity).
- Stretch-Blow Molding Temperature: 95–110°C (optimum preform reheating window for uniform bi-axial orientation).
- Warehouse Storage: Store in a cool, dry area protected from direct UV exposure and moisture. Keep bags hermetically sealed until feeding. Recommended storage temperature: 10–30°C.
- Shelf Life: Stored in original unopened packaging under standard conditions, the material maintains optimal processability for up to 12 months from manufacture date.
Comprehensive Grade Comparison: Shahid Tondgooyan Bottle PET
| Property | BG845 | BG825 | BG821 (BG-820 S) | BG821 (BG-820 N) | BG785 |
|---|---|---|---|---|---|
| Intrinsic Viscosity (IV) | 0.84 – 0.88 | 0.82 – 0.86 | 0.80 – 0.84 | 0.78 – 0.82 | 0.78 – 0.82 |
| Primary Application | Ultra-large carboys, industrial containers | Large bottles, jars, and carboys | CSD bottles (Carbonated soft drinks) | Mineral water bottles | General water and beverage bottles |
| Key Advantage | Maximum IV + Lightweighting | High IV + Creep resistance | Low $CO_2$ permeation | Clarity + Ultra-Low AA | Balanced general-purpose |
| Target Bottle Volume | 5 – 20 Liters | 2 – 10 Liters | 0.3 – 2.5 Liters | 0.3 – 1.5 Liters | 0.3 – 2.0 Liters |
| Acetaldehyde (AA) Content | < 1.5 ppm | < 1.5 ppm | < 1.5 ppm | < 1.0 ppm | < 1.0 ppm |
| Food Grade Approved | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes |
| Polymerization Technology | SSP (Extended) | SSP | SSP | SSP | SSP |
| Melting Point (°C) | 245 – 255 | 245 – 255 | 245 – 255 | 245 – 255 | 245 – 255 |
| Density (g/cm³) | 1.38 – 1.40 | 1.38 – 1.40 | 1.38 – 1.40 | 1.38 – 1.40 | 1.38 – 1.40 |
| Performance Tier | Premium (Ultra-High IV) | Advanced (High IV) | Specialized (CSD-Optimized) | Standard+ (Water-Grade) | Standard (General-Purpose) |
| Selection Guide | 5–20L carboys, heavy industrial, deep lightweighting | Wide-mouth jars, 2–10L bottles | Carbonated soft drinks, beer, sparkling water | Still mineral water, drinking water | General-purpose bottles, baseline converting |
Selection Guide: For container volumes above 5 liters or aggressive lightweighting programs requiring structural integrity, BG845 is the recommended choice. For standard 2-to-10-liter containers, BG825 offers a balanced commercial alternative. Contact our technical team for custom grade matching.
Pre-Production Operator Checklist
Pre-Processing Quality Control Checklist for PET BG845
- ✅ Moisture Verification: Ensure resin moisture is below 30 ppm prior to extruder intake.
- ✅ Dryer Temperature: Set desiccant dryer to 160–170°C (under-drying causes hydrolysis; overheating causes surface oxidation).
- ✅ Dryer Dew Point: Confirm dew point is $\leq -40\text{°C}$.
- ✅ Residence Time: Maintain 4–6 hours drying time (closer to 6 hours for high-IV BG845).
- ✅ Hopper Purging: Use dry nitrogen or dry air purge in the feed hopper to prevent moisture re-absorption.
- ✅ Melt Temperature: 270–290°C — never exceed 295°C to avoid thermal degradation and elevated acetaldehyde.
- ✅ Hot Runner Maintenance: Ensure regular cleaning of screws and hot runners to eliminate dead zones and black specks.
- ✅ Preform Mold Chilling: Set chiller water to 6–12°C for rapid amorphous preform quenching.
- ✅ Blow Temperature: Maintain preform reheat temperature at 95–110°C to prevent pearlescence or thermal haze.
- ✅ Blowing Pressure: Regulate blow pressure (typically 20–40 bar) aligned with stretch ratios and preform designs.
Competitive Advantage: Why Procure BG845 from MizanPetroGas?
PET BG845 is a critical raw material in industrial packaging manufacturing. MizanPetroGas provides direct factory sourcing from Shahid Tondgooyan Petrochemical, supplying original material backed by official manufacturer Certificates of Analysis (COA), standard palletized packaging, and complete technical consulting. Our polymer engineers assist with machine parameter optimization, defect troubleshooting, and precise resin qualification.
Direct Supply from Shahid Tondgooyan Petrochemical | Guaranteed Authenticity | Nationwide & Export Delivery | Dedicated Technical Support
Frequently Asked Questions (FAQ)
1. What is the main difference between BG845 and BG825, and which should I choose?
The key difference is the Intrinsic Viscosity (IV): BG845 provides an IV of 0.84–0.88 dL/g compared to 0.82–0.86 dL/g for BG825. This increase translates to longer polymer chains and enhanced mechanical load-bearing capacity. Choose BG845 for 5-to-20-liter carboys, heavy industrial containers, or projects requiring wall thickness reduction (lightweighting). For standard 2-to-10-liter containers and general jars, BG825 is an economical option.
2. Can I blend BG845 with other PET grades?
Blending resins with different IV ratings is not recommended. Blending dissimilar grades causes a broad, bimodal molecular weight distribution and melt viscosity fluctuations, leading to processing instability and uneven wall thickness. If blending is unavoidable, perform pilot trials and review results with our technical specialists.
3. Is BG845 suitable for Carbonated Soft Drink (CSD) bottles?
No. For carbonated beverages, BG821 (BG-820 S) is optimized with an appropriate IV (0.80–0.84 dL/g) and enhanced $CO_2$ barrier retention. BG845 is over-engineered for small carbonated beverage containers and its higher viscosity can create processing challenges on high-speed CSD blow-molding lines.
4. What are the Minimum Order Quantities (MOQ) and delivery terms?
MOQ, logistics schedules, and pricing are coordinated based on allocation volumes and delivery locations. Contact our commercial department for official proforma invoices, current stock availability, and multimodal freight arrangements.
5. Does MizanPetroGas provide technical line-setup support for BG845?
Yes. Our polymer technical support team assists clients with injection and blow-molding parameter setup, troubleshooting molding defects (such as haze, pearlescence, gate crystallization, or stress whitening), and optimizing production cycles.
Summary
Polyethylene Terephthalate Grade 845 (PET BG845) represents the highest standard in bottle-grade PET resins. Engineered by Shahid Tondgooyan Petrochemical with the highest intrinsic viscosity in standard bottle grades, it serves manufacturers of large-format carboys, heavy industrial containers, large food jars, and lightweighted packaging. MizanPetroGas Company supplies this premium polymer with guaranteed authenticity, competitive pricing, and full technical support.
Procure PET BG845 — Request Official Quotation
Our polymer sales team provides technical consulting, real-time market pricing, and immediate order fulfillment.
sell@mizanpetrogas.com
09155118932 — Direct WhatsApp Contact
Email Quotation Request
© All technical content rights reserved for MizanPetroGas | www.mizanpetrogas.com
