pH Measurement The Importance of pH Value in Shampoo Development

Do you know that the pH level of your shampoo plays a crucial role in the health of your hair and scalp? Maintaining the right pH balance helps protect the hair’s natural oils and prevents scalp irritation. This article will walk you through why pH matters for your hair and scalp, and how to accurately measure the pH of shampoo.

The natural pH of the human scalp is approximately 5.5, which means it is slightly acidic. This mild acidity helps maintain the scalp’s barrier function. Haircare products with a pH lower than 5.5 may cause scalp irritation. Therefore, maintaining a shampoo pH close to the scalp’s natural level is important for comfort and health.

The pH of shampoo can influence the scalp and skin environment, including its bacterial microflora. The natural slightly acidic pH (around 4.5 to 5.5) supports a balanced microbial community. This helps to protect against harmful bacteria and fungi. Shampoos with pH significantly higher or lower than this range can disrupt this balance. It can potentially cause dryness, irritation, or infections. Formulating shampoos to match the scalp’s natural pH helps maintain healthy scalp microflora and overall skin health.

How does Alkaline pH Affect Hair?

Most commercial haircare products balance consumer comfort with hair health. Hair itself is inert and does not transmit sensations, but the skin and eyes respond quickly to harsh chemicals, often causing discomfort. At alkaline pH levels (7 to 14), hair develops an increased negative electrical charge on its surface. This leads to higher friction between hair fibers. As a result, knotting, increased cuticle damage, and breakage can occur during brushing or washing. Shampoos and conditioners with a pH around 4.5 to 5.5 helps reduce frizz by lowering the static charge on hair.

However, shampoos with lower pH can irritate the eyes. Consequently, many manufacturers aim for formulations around neutral pH (about 7) to balance efficacy and comfort.

How to Measure the pH of Shampoo?

Measuring the pH of shampoo is not as straightforward as testing a simple liquid. Its thick, viscous texture and complex chemicals pose unique challenges. Ordinary pH sensors can struggle, risking inaccurate readings and shortening sensor lifespan. That’s why selecting the right tool is essential. The Sevendirect meter from Mettler Toledo is ideal for monitoring the pH throughout each phase of production. Complementing the meter, the Inlab Viscous Pro-ISM sensor is specifically designed for thick and challenging samples. When you combine this with good measuring practices, you are set to achieve reliable and precise pH measurements. This ensures high-quality shampoo formulation and quality control. Here are some best practices for consistent, high-quality results.

A) Calibration:

• Calibrate the pH meter with two appropriate buffer solutions before testing.

• Recalibrate regularly and verify accuracy during extended measurements.

B) Measurement:

• Immerse pH sensor in a shampoo sample.

• Take pH readings three times for accuracy.

• Rinse and dry sensor after use.

C) Maintenance:

• Activate the sensor by removing its protective seal before use.

• The sensor requires minimal maintenance and no electrolyte refilling.

Therefore, to get correct pH readings, you need a reliable and accurate tool and Mettler Toledo offers an option for this. You can download an application note “pH Measurement in Shampoo” to learn how to measure shampoo pH easily and get good, accurate results.

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