8. "Ironing" MF6 at too high a temperature
On a steam iron you can choose the temperatures suitable for fabrics made of different substances. In the following experiment you will compare the stabilities of the six fabrics in MF6 at too high a temperature. .y.y.

Materials
Tray, stripe (1 cm) of multifiber 6 (MF6): Diacetate (1), cotton (2), polyamide (3), polyester (4), polyacrylic (5), wool (6),
steam iron, micro spirit burner, circle steel lid of a can, test tube holder (wooden clothes peg wrapped with aluminium foil, methylated spirit, matches.
Experiment
1. Look for a steam iron (Fig. 1) to test, which fabric needs the lowest temperature compared to wool and to cotton
2. Label a MF6 stripe (1 cm) 1 - 6.  (in Figure 2 the 6 fibres are saparated).
3. Place the stripe on the middle of the circle steel lid (upper part of Fig. 3).
4. Get familiar with the micro spirit burner, lit it.
5. Hold the lid with the MF6 stripe above the flame and heat the stripe equaly by moving the lid to the right and to the left.
6. Stop heating as soon as the samples 1, 3, 4, 5 look like in Fig. 3.

Observation (Fig. 3 lower part)
1. The synthetic fibres of polyamide (3) and polyester (4) melt first, cellulose diacetate (1) and polyacrylic (5) follow.
 2. A the same temeprature wool (6) shows only minor changes and cotton (2) does not change at all.

Explanation
1. The synthetic fibres 3, 4, 5 as well as cellulose diacetate (1) are made of thermoplastic substances.
     This means that their very thin fibres melt and loose their shape.
     The experiment shows, why, clothes made of synthetic fibres are very dangerous in case of burning.
2. The natural fibres cotton and wool resist the heat produced in the experiment.
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