Editorial Technical Reference

Temperature-Controlled Barrel

This page explains how Temperature-Controlled Barrel is classified within Rubber and Plastic Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A precisely temperature-regulated cylindrical chamber in a Polymer Melt Flow Index Tester where polymer granules are melted under controlled conditions.

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Temperature-Controlled Barrel in a manufacturing environment
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Product Specifications

Technical details and manufacturing context for Temperature-Controlled Barrel

Definition
The Temperature-Controlled Barrel is a critical component of a Polymer Melt Flow Index (MFI) Tester. It is a cylindrical chamber, typically made of high-grade steel, designed to house and melt a precise quantity of polymer granules. Its primary function is to maintain the polymer sample at a specific, uniform temperature (as per testing standards like ASTM D1238 or ISO 1133) to ensure consistent melt viscosity before the material is extruded through a standardized die under a defined load for flow rate measurement.

Constructed from materials such as stainless steel (e.g., 316L) or high-temperature alloy steel, the barrel is engineered to withstand repeated thermal cycling and abrasive polymer melts. Key dimensional parameters include an inner diameter of 9.5–12.7 mm and a length of 150–200 mm, conforming to ISO 1133. The operating temperature range spans 50–400 °C, with a temperature accuracy of ±0.2 °C and uniformity of ±0.5 °C along the barrel length and circumference. Heating power is typically 300–600 W, sufficient for rapid heating and recovery. Temperature sensing is achieved via a PT100 Class A platinum resistance thermometer (IEC 60751).

Material specifications may include hot-work tool steel X40CrMoV5-1 (DIN 1.2344) with a surface hardness of 48–52 HRC (DIN EN ISO 6508) and a surface roughness of Ra 0.2–0.4 µm (ISO 4287) to reduce melt adhesion. The barrel is designed for an operating pressure of 1.0–1.6 MPa. Insulation resistance is ≥100 MΩ at 500 V DC (IEC 60243) for electrical safety. The weight ranges from 5–10 kg depending on size and heating elements.

These values serve as directory reference ranges; actual specifications must be confirmed with the legal manufacturer or supplier for the specific model and application. Standards listed are procurement references and do not imply certification or compliance of any particular product.
Working Principle
The barrel is heated by external heating elements (e.g., band heaters) and its temperature is precisely monitored and regulated by a PID controller via a thermocouple sensor embedded in or near the barrel wall. This creates a stable, uniform thermal environment to completely melt the polymer charge without degradation, ensuring the melt's rheological properties are consistent for accurate flow index determination.
Common Materials
Stainless Steel (e.g., 316L), High-Temperature Alloy Steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Barrel Inner Diameter9.5–12.7 mmStandard sizes for melt flow index testingISO 1133
Barrel Length150–200 mmDetermines sample volume and residence timeISO 1133
Temperature Range50–400 °CCovers all common thermoplasticsISO 1133
Temperature Accuracy±0.2 °CCritical for reproducible melt flow indexISO 1133
Temperature Uniformity±0.5 °CAlong barrel length and circumferenceISO 1133
Heating Power300–600 WSufficient for rapid heating and recovery
Temperature SensorPT100 ΩClass A platinum resistance thermometerIEC 60751
MaterialX40CrMoV5-1Hot-work tool steel with high wear resistanceDIN 1.2344
Surface Hardness48–52 HRCEnsures durability against abrasive polymersDIN EN ISO 6508
Surface RoughnessRa 0.2–0.4 µmSmooth bore reduces melt adhesionISO 4287
Insulation Resistance≥100 MΩAt 500 V DC, ensures electrical safetyIEC 60243
Weight5–10 kgDepends on barrel size and heating elements

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Barrel Body / Liner Part
    Forms the main cylindrical chamber that contains the polymer melt. Provides structural integrity and thermal mass.
    Material: Stainless Steel
  • Heating Band(s)
    Electrical resistance heaters wrapped around the barrel exterior to provide the necessary thermal energy.
    Material: Insulated Metal Sheath with Heating Element
  • Thermocouple Well Part
    A port or embedded channel to house the temperature sensor for accurate feedback to the controller.
    Material: Stainless Steel
  • Thermal Insulation Jacket
    Minimizes heat loss to the environment, improves temperature stability and efficiency.
    Material: Ceramic Fiber or High-Temperature Insulation

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 50 bar (max operating pressure)
flow rate: 0.1-10 g/10 min (MFI test range)
temperature: Ambient to 400°C (typical polymer processing range)
slurry concentration: Not applicable - designed for dry polymer granules only
Media Compatibility
✓ Thermoplastic polymer granules (e.g., PP, PE, PS) ✓ Polymer compounds with additives ✓ Recycled polymer flakes
Unsuitable: Corrosive chemicals or reactive monomers
Sizing Data Required
  • Required melt flow rate range (g/10 min)
  • Maximum polymer processing temperature (°C)
  • Barrel diameter needed for sample volume

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal stress cracking
Cause: Rapid temperature cycling or uneven heating/cooling causing material fatigue and micro-fractures in the barrel wall
Insulation degradation
Cause: Moisture ingress, physical damage, or aging of thermal insulation materials leading to heat loss and temperature control instability
Maintenance Indicators
  • Audible hissing or bubbling sounds from insulation indicating moisture intrusion
  • Visible condensation or frost patterns on the external surface suggesting insulation failure
Engineering Tips
  • Implement gradual temperature ramp-up/down protocols to minimize thermal shock and stress accumulation
  • Establish regular infrared thermography inspections to detect insulation gaps and temperature uniformity issues before failure occurs

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASTM E230/E230M - Standard Specification for Temperature-Electromotive Force (EMF) Tables for Standardized Thermocouples CE Marking - Directive 2014/68/EU (Pressure Equipment Directive)

Quoted from the published standard.

Manufacturing Precision
  • Temperature Control Accuracy: +/-0.5°C
  • Barrel Bore Diameter: +/-0.05mm
Quality Inspection
  • Pressure Test - Hydrostatic or Pneumatic per ASME BPVC Section VIII
  • Temperature Uniformity Survey - Per ASTM E230/E230M
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Manufacturers of Temperature-Controlled Barrel

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Frequently Asked Questions

What is the typical inner diameter range for this barrel?

According to ISO 1133, the inner diameter is typically 9.5–12.7 mm. However, always confirm the exact dimension for your specific model with the manufacturer.

What temperature accuracy can be expected?

The temperature accuracy is typically ±0.2 °C, with uniformity of ±0.5 °C along the barrel. These values are reference ranges; verify with the supplier for your application.

Which materials are commonly used for the barrel?

Common materials include stainless steel (e.g., 316L) and high-temperature alloy steel. Some barrels may use hot-work tool steel like X40CrMoV5-1 (DIN 1.2344) with a hardness of 48–52 HRC.

How is the temperature controlled?

The barrel is heated by external band heaters, and a PID controller regulates temperature using a PT100 sensor. This ensures stable and uniform heating for accurate melt flow index measurements.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Industrial Ecosystem & Supply Chain Structure

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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