APM HEXSEAL由Milton Morse和Riva Solins Morse于1947年创立，其使命是开发和制造环境密封解决方案，以保护和延长机电开关和断路器的使用寿命。

在第二次世界大战期间，美国军方认识到需要保护在恶劣环境中运行的电气设备的关键控制。米尔顿是一位自学成才的工程师和杰出的创新者，他接受了挑战并开始设计原始的密封开关“靴子” - 一种模制的覆盖物，保护拨动开关和安装面板免受各种液体和气体的渗透。米尔顿的“靴子”取得了巨大的成功，这促使他开发并申请了全系列的开关，电位器和断路器密封件，这些密封件可在最极端，不利和不可预测的环境条件下可靠地运行至100,000次以上的驱动。

Milton和他当时的年轻企业APM Hexseal继续协助开发MIL-B-5423规范（现为MIL-DTL-5423），该规范为军方的新设备保护要求设定了初始标准。这个军用规范实际上是基于APM Hexseal经过验证的设计和制造工艺编写的。

年复一年，APM Hexseal的靴子通过严格的军事检查和独立的QPL等同物。今天，APM Hexseal拥有广泛的硅胶密封靴系列，可与世界各地使用的绝大多数开关，断路器，编码器，电位器和其他旋转设备配合使用，所有这些都继续通过严格的第三方测试。其中许多部件现在都带有UL认证。

在军方取得初步成功之后，不久之后，美国和国外的工业和商业市场都需要APM Hexseal产品。

APM Hexseal继续开发和申请其他密封产品，包括完整系列的可重复使用的自密封紧固件和垫圈，这些产品最初用于在我们的断路器密封安装法兰上提供额外的密封保护（IP66 / 68进口额定值）。使用我们的自密封硬件已经扩展到涵盖了无数的应用程序。

APM HEXSEAL was founded in 1947 by Milton Morse and Riva Solins Morse with a mission to develop and manufacture environmental sealing solutions to protect and prolong the life of electromechanical switches and circuit breakers.

During World War II, the United States Military recognized the need to protect the critical controls for electrical equipment operating in harsh environments. Milton, a self-taught engineer and brilliant innovator, stepped up to the challenge and proceeded to design the original sealing switch “boot” — a molded covering that protected both toggle switch and mounting panel from being infiltrated by liquids and gases of all kinds. Milton’s “boot” was a huge success, which led him to develop and patent a full line of switch, potentiometer and circuit breaker seals that could operate reliably to 100,000+ actuations, under the most extreme, adverse and unpredictable environmental conditions.

Milton and his then young business APM Hexseal went on to assist with the development of the MIL-B-5423 specification (now MIL-DTL-5423) which set the initial standards for the military’s new equipment protection requirements. This military specification was actually written based on APM Hexseal’s proven design and manufacturing processes.

Year after year, APM Hexseal’s boots passed rigorous military inspections and independent QPL equivalents. Today, APM Hexseal has an extensive line of silicone sealing boots that mate with the vast majority of switches, breakers, encoders, potentiometers and other rotary devices used throughout the world, all of which continue to pass rigorous third party testing. Many of these parts now carry UL Recognition.

After the initial success with the military, it was not long before there was demand for APM Hexseal products from the industrial and commercial marketplaces, both within the United States and abroad.

APM Hexseal went on to develop and patent other sealing products, including a complete line of reusable self-sealing fasteners and washers, which were first used to provide additional sealing protection (IP66/68 ingress rating) on our circuit breaker seal mounting flanges. Use of our self-sealing hardware has since expanded to cover an immeasurable number of applications.