Yes, tulle is indeed flammable. Tulle is a lightweight, very fine netting, usually made from silk, nylon, or rayon. These materials are all synthetic and have the potential to catch fire quickly. Therefore, it's crucial to keep tulle away from open flames or high heat sources, particularly in event settings such as weddings or parties where tulle might be used for decoration. Safety should always be a priority when planning an event, so it's important to consider this aspect when choosing your decor materials.