While we recommend printing Blu at temperature 25C or above, a heater is not required. Please refer to user guide for more detail Introducing Blu by Siraya Tech, an easy to use tough resin that performs under stress. Now in emerald blue color. It balances strength and hardness and is ideal for making functional parts that are strong yet with some flexibility. Unlike many resins on the market that are too brittle to handle even the slightest drop, Blu has excellent mechanical properties that can withstand forces without breaking easily. We were able to make a hook with it and pull up 20kg weight without breaking. Imagine the kind of projects you can do with it. Blu is also formulated to print fast with a high success rate on LCD printers. Unlike many engineering resins, prints can be easily cleaned with common alcohols and post cures quickly as well. It has excellent resolution, primes well, and is used by model makers to create sculptures as art pieces. And it does not smell so it wouldn't stink up your workplace. Its mechanical property: Tensile Strength 39Mpa Shore D 85 Young’s Modulus 1500Mpa Elongation At Break: 25% So whether you are a product developer, model maker or new to resin 3D printing, let Blu brings your creativity into reality.