Differences Of Untreated Asian And Caucasian Hair

Because of the differences in cross-section, we found different wet and dry tensile strengths of single hair fibers. Asian hair shows higher values than Caucasian hair. The application of a perm, bleach, or both results in decreasing tensile forces for both hair types (Fig. 3). The higher values for dry combing forces are found again for Asian hair (Fig. 4). The wet combing work shows comparable results for the untreated hair types.

In addition to these results we measured the bounce of curls. For a natural appearance of hair the physical parameters attenuation, maximum zero amplitude and force of elonga-

Asian Caucasian

Figure 4 Combing work of Asian and Caucasian hair.

dry wet dry wet

Asian Caucasian

Figure 4 Combing work of Asian and Caucasian hair.

Asian Caucasian Asian Caucasian

Figure 5 Bouncing of Asian and Caucasian hair.

Asian Caucasian Asian Caucasian

Figure 5 Bouncing of Asian and Caucasian hair.

tion are important. If these values are too low, the single hair fibers are not connected to each other. A natural swinging behavior of hair tresses needs entanglements of hair fibers. Therefore, styling products as well as products for fine hair are formulated with polymers. Figure 5 shows the bouncing behavior of untreated hair tresses. Water is used as standard. Differences between Asian and Caucasian hair are detected for the 0-amplitude and the force of elongation. This may be considered a result of the difference in the cross-section of these hair types.

A further difference is split-end generation. As a simulation for the building of split ends 10 washing cycles followed by 3000 combing cycles with a rough comb has been used. Asian hair has a higher tendency for generating split ends by applying this method.

Figure 6 Influence of protein hydrolysates and surfactants on the wet tensile strength of permed hair tresses.

Table 3 Types of Shampoos and Their Use

Shampoo type

Hair type

Baby shampoo Shampoo for dry hair Shampoo for fine hair Shampoo for greasy hair 2-in-1 shampoo Antidandruff shampoo Detangling shampoo Neutralizing shampoo Protective shampoo (after perms, colors, etc.)

All baby hair Caucasian, African Caucasian, African Caucasian, Asian All All

African African All

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