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As per ASTM D 1603, IS 4984 and IS 2530 to determine carbon black content of plastics.
International Equipments is a leading manufacturer, supplier and exporter of Carbon Black Content Apparatus in India. Built at our Mumbai facility, our Carbon Black Content Apparatus is a purpose-built pyrolysis-based instrument that determines the exact percentage of carbon black in plastic samples — primarily HDPE water and gas pipes — strictly as per ASTM D 1603, IS 4984 and IS 2530.
Carbon black content is one of the four most important QC tests for any HDPE water pipe, PE gas pipe or HDPE PLB telecom duct (along with Hydrostatic Pressure, Carbon Black Dispersion and OIT). The 2.0% to 2.5% carbon black loading required by Indian and international standards is what protects the pipe from UV degradation over its 50-year service life — the difference between a pipe that lasts five decades and one that becomes brittle and cracks within months of outdoor exposure. Our Carbon Black Content Apparatus delivers the exact percentage measurement that BIS-certified HDPE pipe manufacturers need for ISI mark documentation, BIS audit and routine batch QC.
A Carbon Black Content Apparatus — also called a Carbon Black Tester, Pyrolysis Furnace Apparatus or Carbon Content Determination Setup — is a specialised laboratory instrument that determines the carbon black percentage of a polymer sample by the pyrolysis method specified in ASTM D 1603. The sample is placed in a combustion boat inside a heated combustion tube, then heated to a controlled high temperature (typically around 550°C) in a nitrogen atmosphere. The nitrogen prevents the carbon black itself from burning while the polymer matrix is pyrolysed (thermally decomposed) away. After cooling, the residual carbon black is weighed — giving the carbon black content as a percentage of the original sample mass.
The apparatus consists of a refractory-lined furnace (the heating unit), plus a complete set of glassware accessories — combustion tube, combustion boat, glass U-tube, glass end caps, glass traps, rotameter and rubber tubing — which together form the controlled nitrogen-gas-flow pyrolysis path. This is fundamentally different from a generic muffle furnace, which heats samples in air and would simply burn off both the polymer AND the carbon black, giving no useful carbon content data. The dedicated combustion tube + nitrogen flow is what makes accurate carbon black content measurement possible.
Our Carbon Black Content Apparatus is built around a precision furnace with a 10 inch × 8 inch × 8 inch working chamber — comfortably sized to accommodate the standard combustion tube assembly used in ASTM D 1603 testing. The furnace covers the full ambient-to-1150°C range, which gives ample margin above the ~550°C pyrolysis temperature specified for the carbon black content test, plus the higher temperatures needed for subsequent ash-content measurements when required.
The mild-steel outer body is powder-coated for long lab life in busy QC laboratory environments. Standard 230 V / 50 Hz single-phase operation makes the apparatus compatible with any Indian or export laboratory power point — no three-phase connection required.
Every essential glassware item is supplied as part of the standard accessory pack — combustion tube, combustion boat, glass U-tube, two glass end caps, three glass traps, a rotameter for nitrogen flow control and rubber tubing. The customer needs to arrange only the nitrogen gas cylinder, the precision analytical balance (typically 0.1 mg readability) and a desiccator for cooling — all standard items in any well-equipped polymer QC laboratory.
Carbon black content is one of the most heavily tested QC parameters in the plastic pipe industry. Here is why every HDPE pipe, PE gas pipe and HDPE PLB duct manufacturer needs in-house carbon black content testing capability:
UV Protection for 50-Year Service LifeHDPE pipes carry water, gas and telecom cables for service lives of 25, 50 even 100 years — often with significant outdoor exposure during storage, installation and (in some applications) full-time service. Without carbon black loading, polyethylene degrades quickly under UV radiation, becoming brittle and cracking. The 2.0% to 2.5% carbon black loading required by IS 4984 is what absorbs UV light and protects the polymer chain — giving the pipe its rated long-term life.
Mandatory for ISI Mark Certification (IS 4984, IS 14333)BIS certification for ISI mark on HDPE water pipes (IS 4984), HDPE sewerage pipes (IS 14333) and HDPE PLB ducts (IS 14930) all require the manufacturer to demonstrate in-house carbon black content testing capability. The Carbon Black Content Apparatus is one of the mandatory instruments listed in the BIS scheme of testing and inspection for HDPE pipe products.
Required by DOT Specification for PLB DuctDepartment of Telecom (DOT) specifications for HDPE PLB duct (used by BSNL, BharatNet, Reliance Jio, Airtel and most government telecom infrastructure projects) explicitly require carbon black content in a tight 2.0–2.5% range. Without documented carbon black content test reports, PLB duct cannot be supplied to most telecom infrastructure tenders.
Catches Compounder Errors and Master-Batch VariationMost HDPE pipe manufacturers buy carbon-black-loaded compound from polymer compounders, or add carbon black master-batch at the extruder. Either way, dosing errors happen — the wrong concentration master-batch, a let-down ratio mistake, a tired master-batch feeder. The Carbon Black Content Apparatus catches these errors batch-by-batch before they reach the customer.
Too Little Carbon Black = Premature BrittlenessAn HDPE pipe with significantly less than 2.0% carbon black will become brittle and crack under UV exposure — sometimes within months of installation. Field failures of this kind generate warranty claims, project disputes and long-term damage to the manufacturer's brand reputation. Carbon black content testing prevents this.
Too Much Carbon Black = Wasted Material CostCarbon black is more expensive than the host polyethylene. Over-dosing wastes raw material cost on every kilogram of compound produced — a cost saving that adds up quickly across the millions of metres of pipe extruded annually. Carbon black content testing ensures the loading is on target — not below spec (failure) and not wastefully high
The carbon black content test is a multi-step procedure that takes 1-2 hours per sample, depending on furnace warm-up and cool-down times:
The standard supply includes a complete accessory set for the ASTM D 1603 pyrolysis method — everything needed to run the test except customer-supplied nitrogen gas, analytical balance and desiccator:
Combustion Tube (1 no.)The central glass tube in which the sample is heated under nitrogen atmosphere. Houses the combustion boat at its centre.
Combustion Boat (1 no.)The small refractory boat that holds the polymer sample inside the combustion tube. Resists the pyrolysis temperature without contamination.
Glass U-Tube (1 no.)Routes the nitrogen gas flow path between the combustion tube and the downstream glass traps. Standard ASTM D 1603 glassware item.
Glass End Caps (2 nos.)Seal the ends of the combustion tube and connect to the nitrogen inlet and outlet plumbing.
Glass Traps (3 nos.)Collect the volatile pyrolysis products from the nitrogen exhaust stream so they do not enter the lab environment. Standard ASTM D 1603 glassware.
Rotameter (1 no.)Variable-area flow meter for setting the nitrogen gas flow rate to the value specified by the test standard.
Rubber Tube (1 no.)Flexible interconnection between the nitrogen cylinder, rotameter and inlet glassware.
Desiccator (1 no.)Sample chamber that holds the combustion boat under low-moisture conditions before and after the test — essential for accurate weight measurement.
The Carbon Black Content Apparatus measures the percentage of carbon black in the polymer. IS 4984 requires 2.0% to 2.5%. Too little: pipe will become brittle under UV exposure. Too much: wasted material cost. This is a quantitative percentage test — gives a single number (% carbon black) per sample.
The Carbon Black Dispersion Tester measures how uniformly the carbon black is distributed throughout the polymer matrix — even when the percentage is correct, poorly-dispersed carbon black forms agglomerates that create stress concentration points in the pipe wall. ISO 18553 grades the dispersion against reference images on a 1-6 scale. This is a microstructural quality test.
Together, the two tests catch all carbon-black-related problems: Content catches dosing errors; Dispersion catches mixing and compounding errors. IS 4984 (HDPE water pipes), IS 14333 (HDPE sewerage), and the DOT specification for PLB duct all require BOTH tests as part of mandatory acceptance testing. A pipe that passes Content but fails Dispersion will still fail in service from agglomerate-driven brittle fracture. A pipe that passes Dispersion but fails Content will still fail from UV degradation due to insufficient carbon black.
The following specifications are kept exactly as published on the existing website — no changes have been made to any technical detail:
Contact International Equipments today for a personalised quotation. Tell us your pipe type and the test standards you follow (ASTM D 1603, IS 4984, IS 14333, IS 14930, DOT specification) — our team will share pricing, delivery timeline and the matched Carbon Black Content + Carbon Black Dispersion package option for the complete carbon-black QC requirement.
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