These polyurethane injection needles are specialized tools used to deliver polyurethane (PU) waterproofing resin into cracks, joints, and porous substrates to stop leaks or dampness.
For oil-based PU (OPU) in high-leak or wet conditions, A8 needles are used for medium-reach injections such as swimming pool joints, while A10 needles—with larger diameter and longer length—are ideal for deep delivery into active leaks like basement cold joints or retaining walls with visible water flow.
For water-based PU (WPU) in damp or capillary conditions, B8 needles suit shallow, narrow holes in materials like batako walls or roof slab hairline cracks, while B10 needles reach deeper into thick concrete slabs or retaining walls to block moisture migration.
This selection ensures optimal resin penetration, leak sealing, and structural protection based on site conditions
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