Environmental Sempertex Balloons are 100% biodegradable. They are made of pure 100% natural rubber latex. No fillers, extenders, plasticizers or any cost reducing agents are used. Sempertex products are all ISO and TUV certified. Comfort A soft modulus and proper moisture allows a generous elongation that together with a good tensile strength reduces strong friction. This provides maximum comfort for long decorating events and artists. Quality Excellent helium or air retention due to a high-tech and sophisticated molecular cross-link which builds a high quality barrier, reducing contained gas permeability. Low bursting levels due to a great elasticity of the rubber film. Long Helium Floatation or Air Inflated = Long Lasting Decors