Pressure – sensitive adhesives, which may be safely used as the food, contact surface of labels and / or tapes applied to food in accordance with prescribed conditions.
The homopolymer grades (including micronized types) and oxidized polyethylene M 3400 conform to the specifications required of their product classes and therefore comply with the requirements for use as a component of a pressure – sensitive adhesive for food packaging.See https://www.ecfr.gov for updated regulation information.
1. Homopolymer
As identified and meeting the parameters laid down in 21CFR 172.888.
Ultra violet Absorbance:
Wavelength (nms) |
Typical Absorbance |
Limits |
280 – 289 |
.010 |
0.15 |
290 – 299 |
.07 |
0.12 |
300 – 359 |
.02 |
.08 |
360 – 500 |
0.00 |
0.02 |
Molecular weight (Vapour pressure osmometry):
Typical: 1500 – 1700
2. Oxidized
As identified under 21 CFR 177.1620 ( a ) and meeting all limits.
Molecular weight (VPO): > 1200
Oxygen content: < 5%
Acid number (mgms KOH / gm): >9 < 19
Extracion data (as defined under 21 CFR 177.1520 ( c ) item 2.3
Maximum n – hexane soluble fraction at 50°C 53%
Maximum xylene soluble fraction at 25°C 75%