| Item | Detail |
|---|---|
| What they are | Soft rubber or silicone nozzle cones molded into or over the face plate, standing slightly proud of the surface |
| Why they resist clogging | The nozzle flexes under a wipe, so hardened scale cracks off instead of building a ring inside a rigid hole |
| Where they appear in the catalog | Across filter heads (ZH2091T, ZH2092T families), multifunctional heads (ZH2019 and ZH2117C families) and the three fixed heads |
| The trade-off | Rubber nozzles give a coarser droplet; molded micro-holes give the fine, dense spray behind the high pressure feel but need more cleaning in hard water |
| Combination faces | Several models combine rubber outer rings for the rain zone with a fine-mesh centre for the jet or mist zone |
| Hard-water pairing | In hard-water markets, soft nozzles are commonly specified together with a filter cartridge, since the nozzles address the symptom and the cartridge the water |
| QC | Every finished unit is water tested for about 10 to 15 seconds with the modes exercised; 0.5MPa leakage checks in selected processes |
Why a soft nozzle stays clear
Limescale forms when hard water evaporates at the nozzle exit and leaves calcium and magnesium carbonate behind. On a rigid molded hole the deposit grows inward as a hard ring, narrowing the opening until the jet skews sideways or stops. On a soft rubber or silicone cone the same deposit sits on a surface that deforms: press or wipe it and the rubber flexes, the brittle scale layer fractures, and the hole opens again. Nothing chemical happens. It is a mechanical property of the material.
This is why retail copy calls them stay-clean, self-cleaning or anti-clog nozzles. The honest version of that claim is that they are cleanable by hand without tools or descaling solution, not that they never scale.
The trade-off against micro-nozzle faces
A rubber nozzle has to be big enough to mold, so the droplet it produces is larger than one from a laser-fine molded hole. The dense micro-nozzle faces that give the high pressure feel are rigid plastic precisely because the holes are too small to make in rubber. So a specification usually lands in one of three places: soft nozzles throughout for hard-water durability, rigid micro-holes throughout for spray feel, or a combination face where the wide rain zone uses rubber cones and a central zone uses fine holes.
ZHONGHE's catalog shows all three. The fixed heads ZH3303C, ZH3304C-1 and ZH3308C use concentric rings of rubber nozzles; the transparent filter heads such as ZH2258 and ZH2256T use a white micro-nozzle face; several multifunctional models mix the two on one plate.
Specifying nozzles for a hard-water market
State the market and its water hardness if you know it, the spray feel you want, whether the head also carries a filter cartridge, and whether the retail claim will be stay-clean or anti-clog, so the copy matches the part. Ask for a sample and try the wipe test on the actual face rather than trusting the photograph, because a rubber ring in a photo can be a decorative accent rather than the working nozzle.
Nozzle material is a mold decision. Changing an existing model from rigid holes to rubber cones is a structure change, not a color change, and follows the ODM route with about 15 days of structure design and 60 days of mold making as guides.
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