HP 728, 728B
HP 728 and 728B ink cartridges are engineered for DesignJet wide-format technical printers, functioning on an independent four-colour setup to swap out depleted colours individually. This large-format cartridge series focuses on original high-volume matte black and individual colour configurations to support continuous technical document, map, and blueprint rendering workloads. Our 4.8 Google Star rating shows that our customers consistently receive high-quality cartridges backed by reliable performance.
Expected page output and replacement cycles
These technical ink supplies are measured by volume rather than standard document pages, as coverage varies dramatically between fine-line CAD drawings and full-bleed architectural renders. The matte black 3WX30A cartridge holds 130ml of pigment-based ink, while the F9J65A, F9J66A, and F9J67A colour cartridges contain 40ml of dye-based ink to manage line precision.
Choosing the right cartridge setup
If you print technical CAD line drawings or monochrome blueprints, single matte black replacements protect operational budgets from stalling. For design studios outputting full-colour aerial maps or 3D architectural renders, stocking multi-packs ensures colour balance is maintained without tracking individual depletion. All items feature a reliable money-back guarantee to ensure your wide-format production lines remain uninterrupted. Orders ship from our multi-state logistics infrastructure spanning Sydney, Melbourne, Brisbane, Adelaide, and Perth to cut down delivery times. Free delivery applies on all orders over $99 (conditions apply). To browse our complete selection of original printer supplies, view our dedicated HP ink cartridges range.
Pro Tip
The HP 728 series combines a pigment-based matte black with dye-based colours, meaning the black ink contains solid particles that settle over time. If your wide-format printer sits completely idle for over a fortnight, gently remove the 3WX30A matte black cartridge and rock it side-to-side before starting a print run to redistribute the pigment particles and prevent nozzle banding.
Frequently Asked Questions
What is the practical structural difference between the 728 and 728B cartridge classifications?
The 728B designation specifically identifies the updated 130ml matte black cartridge (3WX30A) engineered to ensure firmware compatibility and optimal pigment suspension across current production runs, whereas standard 728 refers to the 40ml colour inks.
Can I continue printing an architectural plan if one of the 40ml colour cartridges runs empty?
No. The DesignJet operating system locks down the carriage mechanism when any single cartridge hits zero to prevent air from entering the permanent printhead assembly, which would cause permanent thermal damage to the micro-nozzles.
Why does my DesignJet register a drop in colour ink levels when I only plot black CAD line work?
The printer channels minute drops of cyan, magenta, and yellow ink through the printhead during automatic calibration and startup cycles to clear micro-obstructions and prevent heat buildup, consuming colour ink independently of your file settings.
