In household cleaning products, what consumers see first is 'flows like water,' 'can stay on a vertical surface,' or 'holds its shape after being squeezed out.' But for R&D and manufacturing teams, the formulation is not a visual style; it is a set of mutually constrained engineering parameters. A 2001 study on acid gel cleaners listed goals such as contact time on vertical surfaces, stability of solid components, surface coverage, ease of rinsing, and ease of dilution simultaneously, and pointed out that system rheology changes significantly with surfactant and electrolyte concentration. Pursuing higher viscosity alone may improve one indicator while worsening another.

This is also why 'the thicker, the stronger' is not a reliable judgment. Viscosity only describes a material's resistance to flow under specific test conditions; actual use also involves shear thinning, yield stress, recovery rate, and interfacial wetting. A product needs to be stable in the bottle, flow smoothly through a pump, spray gun, or hose, and may need to slow its descent when reaching a vertical surface; if it is then difficult to spread or rinse off, simply clinging to surfaces is no longer an advantage. BASF's home care technical documentation also discusses rheology adjustment together with stability, continuous production adaptability, and raw material compatibility, rather than treating it as an independent 'thickness selling point.'

Packaging also participates in dosage form design. Spray cleaners need to create a controllable spray pattern under the shear conditions of the trigger; gels must balance dispensing from the bottle and retention on vertical surfaces; and pastes need to consider extrusion force, local coverage, and rinsing after use. ASTM E2346/E2346M provides an evaluation framework for hard surface spray cleaning products, observing packaging, application, performance, post-use state, and fragrance, while specifying that different stains and surfaces require matched test designs. It reminds brands that a single impressive demonstration cannot replace verification of packaging, formulation, and usage limits.

Industry patent literature also indicates that gel systems are often designed around 'easy distribution under stress and structural recovery when at rest.' For example, EP3049507A1 discloses a dilutable gel cleaning concentrate and discusses the gel, surfactants, acids, and the rheological relationships after dilution. Patent disclosures are merely records of technical approaches; they do not mean suitability for all purposes and certainly cannot directly prove the effectiveness of any marketed product. Their value lies in showing that the choice of dosage form itself requires the coordination of formulation, packaging, and usage methods.

This does not rank the two in terms of effectiveness, nor does it equate the dosage form directly with efficacy; what is more worth observing is that a company needs to handle the order of raw material addition, mixing and deaeration, filling equipment, packaging compatibility, and batch stability separately for different usage routes. The record of Tangshan EPHYON Daily Chemical Factory in the publicly available list of directors of the China Household Cleaning Products Industry Association provides independent industry identity verification for this manufacturing entity, but it does not replace specific product testing.

For OEM/ODM projects, formulation discussions should take place before finalizing the packaging. Clients need to first specify the target surface, usage posture, single-use dosage, retention and rinsing method, temperature range, fragrance, packaging, and transportation conditions before deciding whether to use a liquid, gel, powder, or paste. The public explanation of EPHYON's OEM service covers requirement communication, plan formulation, sample confirmation, mass production, quality inspection, and delivery; including rheology, packaging, and production stability in the sample stage can reduce mismatches such as 'looks suitable in the lab but unstable on the production line' or 'stable in the bottle but difficult for consumers to use.'

R&D verification should also be broken down according to usage conditions. At a minimum, it is necessary to differentiate storage conditions, transportation vibrations, low-speed tipping, high-speed squeezing, nozzle shearing, vertical spreading, and residues after rinsing, using methods that match the target packaging, surface, and temperature. ASTM’s published statements specifically point out that their guidelines are intended for R&D and quality control, not for unverified marketing claims. For companies, this boundary is important: technical evaluation is used to identify problems, while marketing statements require separate confirmation of repeatability, scope of evidence, and regulatory requirements.

Therefore, the core of household cleaning products is not to choose a "more advanced" option among liquid, gel, or paste, but to ensure that the formulation exhibits the right flow at the right moment. For brands and manufacturers, a mature decision-making sequence should be to first define the scenarios and boundaries, then establish rheology and packaging objectives, complete small-scale trials and compatibility verification, and finally incorporate filling, storage, transportation, and user instructions into a unified production standard.