When filling large tires, it is very important that the right durometer of fill be used for the application. For example it would be totally unnecessary to use a 55 durometer tire fill in hand-truck tires as they would be rock hard and you wouldn't use the much softer 20 durometer in mining equipment. Another thing to consider is that in large tires there are large masses of urethane once these tires have been filled. When the tires are exposed to any kind of sustained use a certain amount of heat will build up in these tires. As the urethane gets warm it can become less stable. The only work around at this point is to simply let the tires cool off for a predetermined amount of time depending on the fill being used.

In most cases tires such as farm implements and tractors can use a 28 durometer fill. This would be the most common type of fill found at the various filling stations around the country. A typical filling operation will wait all week long before gathering up all the tires that need to be filled and then fill them in one afternoon. This is because the urethane needs to be mixed and pumped in and once the urethane begins its mixing process it has a relatively short period of time to make it into the tire. There are some fills the don't even require mixing but are relatively rare and not as an a great a distribution has the other fills.

Another option is to get the mixing equipment and do the filling yourself, (we talk about this on the do-it-yourself page).

We at air free can help you sort through your choices. Give us an e-mail or call and will be happy to help point you in the right direction.

Thank you

Hugh