Factor III Analysis, Material Factors (RFIII Score)
| Relative Diffusion Ratesa (DR aspect) | |
|---|---|
| If the diffusion coefficient at 40 °C (D40) is … . | Then the value of the DR aspect is … |
| Less than 10–13 cm2/sec (for example, PA, PMMA) | 1 |
| 10–12–10–13 cm2/sec (for example, PET, rigid PVC, PS) | 10 |
| 10–12–10–10 cm2/sec (for example, PVDC) | 20 |
| 10–10–10–9 cm2/sec (for example, EVOH, PP) | 40 |
| 10–9–10–8 cm2/sec (for example, plasticized PVC, PE, EP) | 80 |
| Greater than 10-8 cm2/sec (for example, EVA) | 100 |
| Total Additive Levels (Level Aspect) | |
|---|---|
| If the level of total additives is … | Then the value of the level aspect is … |
| <0.01 weight % | 1 |
| 0.01–0.1 weight % | 5 |
| 0.1–1 weight % | 25 |
| 1–10 weight % | 125 |
| >10 weight % | 500 |
| Material Pre-use Processing Effects (Processing Aspect) | |
|---|---|
| If the component is processed as follows … | Then the value of the processing aspect is … |
| No significant processing | 1 |
| Processing by dry heat | 50 |
| Processing by exposure to ionizing radiation | 200 |
| Material Associated with Special Interest Extractables (Alert Aspect) | |
|---|---|
| If the component contains materials that have been associated with special interest extractables … | Then the value of the alert factor is 200. The value is 0 if there are no alerts. |
| RFIII Score = (DR aspect) + (Level aspect) + (Processing aspect) + (Alert aspect); typical range = 3 to 1000 | |
↵Notes: a Based on the relationship between the diffusion coefficient and the amount that diffuses, see eq 1 in the text. See Table VII and references 22, 23 for the diffusion coefficients.