Expanded Silicone in Food Sensitive Applications
| Last Reviewed: Apr 04 |  |
Over the years we have received a number of requests for ‘food quality’ approved silicone foam. Unfortunately information regarding the suitability of silicone foam, for this type of application, has been very limited. The term ‘food quality/worthiness’ can be misleading and has proved to be a very complex area in relation to approval and product development. In our view it is unlikely that silicone foam will be given a ‘general approval for use’ by any independent test authority such as FDA, NSF, UL etc. Although there are polymer bases available that have been ‘approved’ the additional components used within the foam product mix, vulcanising catalysts and blowing agent, have not. In our experience to obtain approval, it would be necessary to assess the starting mix and finished product, determine what substances the component would come into contact with and consideration given to the actual working environment. From this our interpretation of the requirements of FDA etc is that you can only seek approval for the use of a ‘specific product’ in relation to a ‘specific application’.
We believe that in food sensitive applications there are two key areas, area 1 – food zone ‘contact’ and area 2 – splash zone – ‘non contact’, these two areas are clarified as follows;
Area 1 – Food Zone ‘Contact’ – the product will come into direct contact with foodstuffs. In this situation our position is clear, we do not recommend our product for use!
Area 2 – Splash Zone ‘Non Contact’ – the product will not come into direct contact with foodstuffs and will be used as seals on food containers (pre-packed or covered), food processing ovens, refrigeration seals and food processing/handling equipment etc. In this situation we feel that our product is safe for use.
All our products are fully post cured and we do use a low additive content within the starting mix. To date we have not received any information in relation to problems caused by using silicone foam in food sensitive applications. Following the above guidelines in area 1 and 2 potential users of silicone foam must assess the specific requirements of the application prior to any design or use consideration.