The four crossword solutions for the term 'balloon material' are NYLON (5 letters), mylar (5 letters), LATEX (5 letters), and LEAD (4 letters). NYLON is a synthetic polymer made from petroleum-based chemicals, and is often used to make balloons due to its strength and durability. Mylar is a type of plastic film made from polyester, and is also used to make balloons because it is lightweight and resistant to heat. LATEX is a natural rubber made from the sap of rubber trees, and is commonly used to make balloons because it is flexible and biodegradable. LEAD is a heavy metal that is not typically used to make balloons, as it is toxic and not very durable.