The effect of Alkalis
The effect of alkalis in an aqueous solution, with the exception of ammonia and its derivatives, is quite different, producing the progressive dissolution of the fibre, whilst, water, acids, ammonia and its derivatives, e.g. quaternary ammonium bases and amines break down the fibre without dissolving it.

Sodium Hyperchlorite
The resistance of polyster to sodium hyperchlorite under the conditions to which textiles are normally exposed to it, is excellent.

Sodium Chlorite
Boling for one hour in a 0.2% solution of sodium chlorite at pH 2-3 has no effect on the tensile strength of polyester.

Sodium Hydrosulphite
Those reducing agents which are normally used in textiles processes have no noticeable effect on polyester.

Potassium Dichromate
Polyester which has been treated for 3 days at 800C  in a saturated solution of potassium dichromate to which has been added 1% (Weight / Volume) of sulphuric acid exhibits a very insignificant change in its properties the loss of strength being, for example, less than 5%.

The effect of Acid
The certain chlorine-containing organic acid have the effect of dissolving polyester, Mono-, Di- and trichloracetic in excess of their fusion points, respectively 630, 100 and 550. The solution occurs rapidly at 1000C and in the case of dichloracetic acid, this occurs even at normal room temperature.  The acidic hydrolysis of polyester is not a surface reaction, but continues to act upon the molecules throughout the entire fibre. From a chemical point of view, polyester fibre is liable to hydrolysis. If one discounts extreme conditions, the rate acidic hydrolysis is unexpectedly low, due to polyester having a characteristically good resistance to the majority of organic and inorganic acids.

Electrical Insulations
At 65% R.H. polyester has better electrical resistance than Bakelite. Polyester has very good insulation properties.

Resistance to ultra violet
In its level of resistance to sunlight (measured as a percentage of the original tensile strength), polyester may be regarded as a highly-resistant fibre.  Calculated on the basis of units of weight it has a considerably higher original strength than natural fibres.

The long term effect of heat
Polyester fibre exhibits a very high level of resistance to heat.  The effect of heat on polyester over a long period gradually reduces its tensile strength and its extension point. If exposed to temperatures of about 1500C for a period of six weeks polyester will lose only about 20-25% of its original strength.

The effect of humanity
The normal moisture content of polyester is very low, whilst for nylon it is considerably higher. As a result of extremely low absorption of moisture by polyester its physical properties such as strength, elasticity and modulus vary only slightly in moist or dry conditions below 700C. On the other hand, nylon loses about 10-20% of its strength when wet accompanied by a change in the load / extension curve. After drying, the strength is, of course, regained.

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