MIL-STD-810 Icing & Freezing Rain

Icing and freezing rain testing measures the effects of icing and freezing rain on the operational capability of material. As a MIL-STD-810 certified lab, we realize the importance of freezing rain testing. Meeting the MIL-810 compliance requirements can be difficult. We understand the challenges and guide companies through the process. 

Keystone Compliance takes a consultative approach throughout the entire test program. When products do not meet the requirements, we assist with finding solutions. Our test engineers have a strong reputation of helping clients achieve their MIL-STD product certifications. 

Request a quote to receive testing services customized to your specific needs. Have a question about MIL 810 freezing rain and ice testing? Contact us and we will determine the best course of action.

Icing and Freezing Rain Testing Overview

Icing and freezing rain testing, per MIL-STD 810 Method 521, is conducted to evaluate the effects of icing produced by a freezing rain, mist, or sea spray on the operational capability of equipment.

Icing and freezing rain testing does not simulate snow conditions or the buildup of ice on aircraft flying through supercooled clouds. This method provides tests for evaluating the effectiveness of de-icing equipment and techniques, including expedients.

A buildup of ice occurs in three principal ways:

  • From rain falling on an item whose temperature is below freezing
  • From sublimation
  • From freezing rain falling on an item at or near freezing
  • From sea spray which coats equipment when temperatures are below freezing

MIL-STD 810 identifies two conditions commonly encountered:

  • Clear glaze ice: which occurs when rain or drizzle freezes on objects
  • Rime ice: which occurs when fog droplets or drizzle on surfaces below freezing

Ice formation can create problems such as:

  • Binds moving parts together
  • Adds weight to equipment
  • Increases footing hazard
  • Interferes with clearances between moving parts
  • Induces structural failures
  • Reduces airflow efficiency
  • Impedes visibility through windows and optical devices
  • Affects transmission of electromagnetic radiation
  • Increased probability of damage to equipment from the employment of mechanical, manual, or chemical ice removal measures

Regulatory Military 810 Icing and Freezing Rain Procedures

The first part of the MIL-810 standard determines where the icing/freezing rain is anticipated. Where ice removal is required before the operation of the equipment, the integral deicing equipment or expedients normally available to the operator are used.

The standard MIL-810 method has only one procedure. However, the procedure can be varied. The test temperature is used to produce the required environmental conditions and to prevent premature freezing of the water droplets before they come into contact with the test item.

The objective of this test procedure is to produce a clear, uniform coating of ice. A water delivery rate of 25 mm/hr is suggested.

Icing and Freezing Rain Test Lab Equipment and Capabilities

Keystone Compliance has a drive-in chamber of 12’ wide x 10’ deep x 9’ tall capable of performing icing and freezing rain tests on large test articles. Specially designed atomizing nozzles and pre-chilled water are used for the rapid formation of ice up to the prescribed thickness.

With years of icing and freezing rain test experience, Keystone personnel have the knowledge to reach the desired ice thickness quickly and reduce test time and cost.

Keystone Compliance performs icing and freezing rain tests within any of our environmental chambers. Specially designed atomizing nozzles and water pre-chillers are used to create the formation of ice quickly and uniformly.

Expert Icing & Freezing Rain Regulatory Lab Testing

Icing and freezing rain testing is just one of the climatics testing services Keystone offers. Our engineers have the experience and knowledge to help you with your testing needs.

Icing and freezing rain testing is crucial for your product or package to ensure proper function. Ready to get started? We are. Trust Keystone and contact us today to begin the compliance testing process.

Icing and Freezing Rain Specifications