Sydney Based + National Delivery
Sydney Based + National Delivery
This page explains the chemical and physical mechanisms by which silicone-based DPC injection fluids operate within masonry. It focuses on what occurs inside the pore structure after injection and why correct distribution and saturation are critical.
It is intended as a technical reference for contractors and specifiers, not a marketing overview.
Masonry materials such as brick, stone, and mortar contain a network of capillaries and pores. Rising damp occurs when water migrates upward through this network due to capillary action.
Chemical DPC injection does not block these pores. Instead, it modifies how water interacts with the pore surfaces.
Silonexx operates on Tri-Phase Molecular Technology.
Once injected, the product undergoes two sequential reactions inside the masonry: hydrolysis on contact with residual moisture, then condensation bonding to the mineral substrate.
These reactions occur passively within the wall after injection without the need for applied heat, pressure, or drying.
Masonry minerals contain surface hydroxyl (–OH) groups.
During condensation:
Silane molecules chemically bond to these hydroxyl groups
Covalent bonds form between the silicone compound and the masonry surface
A durable, chemically anchored treatment is created within the pore walls
This is a chemical bond, not a surface coating.
Once bonded:
The pore walls become hydrophobic
The pore structure remains open to vapour movement
Liquid water is no longer able to wet the pore surfaces
The treated zone functions as an internal damp-proof course.
The injected silicone system does not convert water or block moisture mechanically.
Instead, it alters water behaviour by:
Water vapour can still pass through the wall.
When correctly dosed and distributed:
Continuity depends on correct drilling, spacing, and saturation.
Chemical bonding occurs only where the fluid reaches.
Insufficient saturation leads to:
Correct volume and distribution are critical.
Correct establishment of the Capillary Saturation Zone™ at all injection points is the field confirmation that sufficient volume and distribution have been achieved.
Hygroscopic salts do not prevent chemical bonding, but they:
Salt-affected plaster and mortar should be removed where required to avoid misleading post-treatment symptoms.