Alh systems clear polyurethane resin alh systems a6090 a two component polyurethane potting compound that is totally transparent to normal light and forms an excellent water resistant barrier around encapsulated components specially designed divided cartridges and syringes with disposable mixing nozzles provide freshly mixed accurately placed compoundeach 250ml cartridge 1x 87 7172 has 2 compartments inside that keep the resin and hardener separated when the cartridge is compressed in