Are 6 mil clear reinforced polyethylene construction fins the same thing as 6 mil clear plastic sheeting/poly sheeting? Perhaps comparing it to a 4 wheel drive SUV’s and 2 wheel drive SUV’s can help with the analog. The SUV's may look the same in terms of the shape and color of the vehicle, but the performance of the two vehicles vastly differ. The same can be said when you are trying to compare 6 mil clear reinforced (nylon string poly to 6 mil clear plastic sheeting. Both films can be made from virgin resins, but the strings/scrim reinforced film is much stronger due to the string reinforcement.
When people refer to "string reinforced" they are talking about fiber that is placed between two sheets of polyethylene to strengthen the plastic sheeting. This fiber can be made from a variety of materials such as fiberglass, polyester, polypropylene and others. Each string type will offer a different set of benefits. Essentially all those terms are referring to the fact that there is more than just polyethylene in the sheeting. The string/ fiber is what keeps tears to a minimum. If the string is laid equally in both directions it follows that the tear will be the same in both directions.
So how do you decide between the string reinforced and the non-reinforced plastic sheeting? The key is defining the results you want from the poly film for the application at hand. If you need a tougher film, then go for the scrim reinforced version.
Will this film be used outside and thus need UV protection to protect for sun degradation? Some of the addition that can be added to the 6 mil reinforced film are grommets, tie‐downs, hems, zippers, drains, and 3‐D custom shapes are an option. Do you need the film to be fire retardant? That is an option as well.
Both films will do a good job when they are used in applications that suit their intended use.