Ink Cartridge Uprint H-21XL (C9351AE) No.21 Black – high-capacity replacement for compatible printers

Uprint H-21XL No.21 Black is a high-capacity replacement ink cartridge designed for printers compatible with the H-21XL series. It supplies black ink formulated for sharp, consistent text and reliable monochrome printing in office and home environments. The cartridge restores print quality and increases page yield compared with standard-capacity cartridges, making it suitable for frequent document printing and general everyday use.

Advantages

This high-capacity black cartridge offers extended page yield to reduce the frequency of replacements and lower running costs per page. It delivers crisp, legible text and stable monochrome output across standard papers used for letters, reports and forms. The cartridge is manufactured to fit compatible printers reliably and to maintain consistent ink flow for uninterrupted printing tasks.

Suitable for

• Office document printing: reports, invoices, correspondence
• Home printing: homework, personal documents, recipes
• High-volume monochrome printing where fewer cartridge changes are desired
• Environments requiring clear, readable text such as forms and labels

Key specifications

• Color: Black
• Capacity: High-capacity (XL) ink cartridge
• Ink type: Black pigment/dye ink (model-specific formulation for monochrome output)
• Compatibility: Designed for printers compatible with the H-21XL series
• Intended use: Document and text printing on standard office paper

How to use

Remove the used cartridge according to your printer manufacturer’s instructions and unpack the replacement cartridge, taking care to remove any protective tape or seals before installation. Insert the Uprint H-21XL No.21 Black into the designated black cartridge slot until it clicks or seats firmly, then run a test print or alignment procedure if prompted by the printer. Store unused cartridges in a cool, dry place and follow the printer’s maintenance prompts to keep heads and contacts clean for optimal performance.

Usage recommendations

For best results, use this cartridge for everyday monochrome document printing on standard office paper and perform occasional head-cleaning cycles if print density decreases. Avoid prolonged exposure of installed cartridges to direct sunlight or extreme temperatures to maintain ink stability and shelf life.