Measure foam after several minutes, not only the initial height. Amides are drainage tools.
Height and lifetime
A tall flash foam that disappears is a primary-surfactant result with no stabilizer. Alkanolamides are used because they pack into the film and slow drainage. The test is height at one minute and at five minutes in the water hardness you claim.
Esteem describes CMEA and lauramide MEA as foam boosters. Lauric is the denser-foam wording. Bubble-bath marketing that says “dense” should look at that grade rather than only at coco.
Skin and clarity
Bath products sit in a large volume of water, but the neat liquid still has to be clear and mild enough for the label. High amide in the bottle is not the same as high amide in the tub. Dose for the neat clarity and for the diluted foam.
Amine oxides and betaines are the other boosters on the foaming page. If the brief is mildness first, those may lead and the amide may be zero.
Test
Soap in the bath is a soil. Test with a soap chip if users sit with a bar.
Automatic-dishwashing low-foam surfactants are the opposite product. Do not sample them for a bubble bath.
| Measure | Tells you | Amide effect |
|---|---|---|
| Initial height | Primary foamer | Small |
| Height after minutes | Drainage | Main amide job |
| Hard water | Anionic choice | Will not fully fix |
| Neat clarity | Solubility | Overdose clouds |
Drainage is the amide’s job
Bubble bath is sold on foam that is still there after the user sits down. The primary anionic, often SLES, lowers surface tension and creates the bubbles. Left alone, those films drain. CMEA or lauramide MEA packs into the film, raises surface viscosity, and slows the drain. Initial height barely moves. Height after several minutes is the measurement that shows the amide.
The viscosity-builder table describes lauramide MEA for stable, dense foams and CMEA as the coco foam booster. A marketing line that says “dense” should look at the lauric grade, then confirm it still dissolves and stays clear in the bottle. Density in the tub that costs a hazy neat liquid is not a pass.
The bottle and the tub are different concentrations
The neat bath liquid has to be clear, pourable, and acceptable on skin. The use dilution is a spoonful in a tub of water. A high amide level in the bottle is not a high amide level in the bath, but it is high enough to cloud the bottle and to leave a coated skin feel when the dose is past the window. Dose for neat clarity and for diluted foam lifetime together.
Amine oxides and betaines sit on the same foaming-agent list and boost foam by a different structure. If the brief is mildness first, those may lead and the amide may be zero. If the brief is creaminess and drainage, the amide earns the place. Automatic-dishwashing low-foam surfactants are the opposite product and should not be sampled into a bubble bath.
Soil in the bath
A bar of soap in the same water is a soil. Soap scum and hardness collapse the anionic foam, and the amide cannot rebuild what the primary lost. Test with the water hardness you claim and with a soap chip if that is how the product is used. A chelant or a different anionic belongs in the brief when hardness is the failure.
More amide is creamier only up to the clarity and skin-feel limit. Past it, the bottle clouds and the film feels slick rather than light. That is an overdose. Record drainage time, hardness, and neat clarity as three separate results.
How to Specify with Esteem
- Name the anionic foamer and the water hardness.
- Set a drainage time, not only flash foam.
- Dose amide low enough to stay clear and skin-acceptable.
- Include soil or soap if the bath is used with a bar.
- Do not use a defoamer logic from automatic dish.
Foaming-agent grades are on personal care foaming agents.