Surface insensitive adhesives, ultra-fast setting for porous, soft or tough-to-bond substrates. Series 200TX & Gel: No run, no stringing, excellent gap filling characteristics with good strength on a variety of materials.Medium gap fill. Ethyl base monomer. Excellent on rubber/plastic substrates. Fair on metal substrates. Excellent on porous substrates. Military Spec MIL-A-46050C Type 2. Military Spec MIL-A-46050C Class 2. A primer is required for hard-to-bond materials such as polyethylene, polypropylene, acetal, PET, nylon, soft PVC, silicone rubber, and glass.General information about the Aron Alpha® product line: Cyanoacrylates are single component instant adhesives that bond a wide variety of surfaces with a strong, durable bond. They offer ease of application, a wide range of performance parameters, and reliable solvent-free bonding.Toagosei Co., Ltd. produces cyanoacrylates in Japan, marketed as Aron Alpha® in Japan, Cyanolit® in Europe, and Krazy Glue® in the US. Elmer's Products markets Krazy Glue® to the retail trade and Aron Alpha® to the industrial trade in North America. Information provided by Elmer's Products, Inc.