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Table 1 Normal and spiked LCMS results obtained from naturally hydrolysed polyurethane shoe soles stored for up to 50 years

From: Analysing for 4,4′-diaminodiphenylmethane in heritage collections containing solid and medium density flexible linear polyester polyurethanes using liquid chromatography/mass spectrometry

Sample number Approx. date of manufacture AGT Sample identification code PUR sample construction PUR sample colour Normal LCMS solution results Spiked LCMS solution results
Chromatogram peak area ppm in PUR sample Chromatogram peak area ppm in PUR sample
1 1970 M19+SD118 Single density Black 0 0 256,000 4.8
2 1974 1234/2926 Single density Dark brown 0 0 217,000 3.9
3 1972 M19+SD100 Single density Tan 0 0 200,000 3.6
4 1970 M19+SD122 Single density. Black 0 0 162,000 2.9
5 1971 1234/1918A Single density Black 0 0 201,000 3.7
6 1970 1974/770 Single density Black 0 0 206,000 3.8
7 1977 1234/3115 Single density solid elastomer Tan-orange 0 0 211,000 3.9
8 1970 M19+SD123 Single density Black 0 0 203,000 3.8
9 1975 1234/2934 Single density Beige-mid-brown 0 0 169,000 3.1
10 1975 1234/2933 Single density Mid-brown 0 0 183,000 3.4
11 1974 1234/2889 Single density Black 0 0 194,000 3.5
12 1973 1234/2864 Single density Tan-orange 0 0 181,000 3.3
13 1975 W19/SD865 Single density Beige-mid-brown 0 0 197,000 3.6
14 1973 1234/2865B Single density Mid-brown 0 0 190,000 3.5
15 1981 M19/SD339 Dual density Outsole Tan- orange 0 0 105,000 2.6
16 1981 M19/SD339 Dual density. Mid-sole Black 0 0 119,000 3.1
17 1989 C19+SD614 Dual density. Midsole Off-white 10,200 0.3 98,700 2.5
18 1985 C19+SD458LA Single density Light grey 0 0 119,000 3.0
19 1997 Sundapple Single density White 0 0 102,000 2.6
20 1996 0161 Dual density. Outsole Black 11,800 0.3 189,000 4.5
21 1996 0161 Dual density. Midsole Grey 0 0 138,000 3.5
22 1982 W19+SD132 Single density Tan 0 0 135,000 3.4
23 1980–1999 SHO/5/23/3 Single density Cream 0 0.00 778,000 2.7
24 1980–1999 SHO/5/8/1 Single density Cream 0 0.00 776,000 2.7
25 1980–1999 CR/361/17 Single density Brown 24,700 0.02 342,000 1.2
26 1980–1999 SHO/5/37/1 Single density Cream 27,800 0.02 419,000 1.4
27 1980–1999 SHO/5/5/2 Single density Cream 0 0.00 768,000 2.7
28 1980–1999 SHO/5/155 Single density Cream-brown 23,100 0.02 333,000 1.1
29 1982 W19/SD1322 Single density. High blow (hydrolysed 4 weeks) Tan 0 0.00 149,000 3.0
30 1982 W19/SD1322 Single density. High blow (hydrolysed 8 weeks) Tan 0 0.00 757,000 2.6
  1. All samples were coloured by pigments or dyestuffs and showed appreciable physical degradation. Results for accelerated hydrolysis tests are shown in Sample numbers 29 and 30