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DEF STAN 00-035 Part 3 Chemical Testing

Defense Standard 00-035 Part 3: Chemical Environmental Testing

As an ISO-17025 accredited environmental compliance test lab, we realize the importance of environmental regulatory compliance testing. Meeting the environmental defense standard (DEF STAN) 00-035 testing requirements can be difficult. We understand the challenges and guide companies through the process. 

Keystone Compliance proudly provides the peace of mind that all of your environmental compliance needs will be met under one roof. We are in constant communication throughout the whole compliance process. What sets us apart from other NRTLs is our consultative approach throughout the entire test program. When products do not meet the requirements, we assist with the troubleshooting process.

Request a quote to learn why we are one of the fastest-growing compliance test labs in the country. Have a question about DEF STAN 00-035 part 3 chemical testing? Contact us to discuss the best course of action.

Summary of DEF STAN 00-035 Part 3

DEF STAN 00-035 Part 3 evaluates the ability of a material to withstand the effects of specific climatic environments. This standard reproduces the effects of relevant environments. However, the defensive standard 00-035 part 3 does not necessarily duplicate the actual environmental conditions.

DEF STAN 00-035 is generally applicable to packages, materials, and subcomponents.

Within this standard, the test methods are grouped into sections relating to commonly encountered environments. The groups consist of mechanical, climatic, and chemical.

This page covers the chemical environmental compliance testing portion of the defensive standard 00-035 part 3. Please follow the links below for more information on climatic or mechanical environmental testing.



DEF STAN 00-035 Part 3: CHEMICAL

DEF STAN 00-035 Part 3 General Test Procedures

For most test procedures in DEF STAN 00-035 standard, the test specimen must be pre-conditioned. All conditioned samples must begin the test in the condition when in the natural environment.

When no other conditions are specified, but where the environment needs to be controlled, the conditions below are used.

Temperature: 20 C

Air Pressure: 101.3 kPa

Relative Humidity: 65%

When test conditions are specified, the test facility conditions fall within the following ranges below. Variations in temperature and humidity are kept to a minimum. The temperature range for large specimens extends beyond the specified limits below.

Temperature: 15 C to 35 C

Air Pressure: 86 kPa to 106 kPa

Relative Humidity: 25% to 75%

DEF STAN 00-035 Chemical Compliance Testing

CN1 – Mold Growth. The defense standard 00-035 chemical compliance testing evaluates the resistance of material to the damaging effects of microorganisms by their presence or their metabolic products.

For this test, microorganisms are deemed to include mold and bacteria. These may settle and colonize on the surface of a material.

The test applies to material that is used or stored in moderate temperature and high humidity conditions. These conditions are likely to encourage the growth of microorganisms.

Under certain climatic and environmental conditions, microorganisms may settle on and colonize the surfaces of a material.

This test method contains two basic test procedures:

Test procedure A: the units under testing are exposed to a mixed suspension of fungus spores.

Test procedure B: specimens are exposed to a mixed suspension of fungus spores in the presence of a complete medium. I.e. with a carbon source.

CN2 – Corrosive Atmosphere. The corrosive atmosphere compliance test determines the integrity of material to corrosive atmospheres. The primary purpose of this test demonstrates the ability of a material to remain operational during or following exposure to a variety of corrosive environments.

For this test, the procedure consists of the following:

First, coatings and contaminants not normally present on the surface of the unit are removed. Next, the specimen is visually inspected and installed in the test chamber. Prior to testing, the temperature and humidity are adjusted to specified values set out by this standard.

The test solution is continuously atomized. This is done by maintaining a fall rate of 1 ml to 2 ml of test solution per hour.

The specimen is dried to standard ambient temperatures. On completing the test, the specimen is examined for evidence of corrosion and degradation.

CN4 – Contamination by Fluids. Contamination of fluids testing evaluates any potentially damaging effects of contaminating fluids. The test is applicable to exposed fluids during their service life.

CN4 can also be used on complete equipment, sub-assemblies, components, or materials used in the construction of material liable to contamination by fluids.

There are three different methods of exposure to contaminants within this test. The first is occasional exposure, the second is intermittent exposure, and the last is extended exposure to contamination.

Typical times of exposure can range from 5 minutes during occasional exposure, 8 hours for intermittent exposure, and 24 hours for extended exposure. Additionally, the unit under testing is either sprayed, dipped, brushed, or immersed for this standard test method.

CN5 – Corrosion Test for Material Immersed in Salt Water. DEF STAN corrosion testing determines the resistance to corrosion of material when immersed in salt water. The primary purpose of this test is to demonstrate the ability of material to remain operational during exposure.

The saltwater immersion test is a long-term test intended to represent actual conditions of corrosion. This test is not intended to accelerate the rate of corrosion.

On the other hand, the CN2 corrosive atmospheres test standard is intended to accelerate the rate of corrosion due to maritime conditions.

The procedure of this DEF STAN 00-035 part 3 test standard utilizes a tank of salt water into which the specimen is submerged.

After finishing the test, the specimen is removed from the saltwater solution. Specimens are required to operate during exposure.

Expert Defense Standard 00-035 Part 3 Chemical Compliance Testing

Our team strives to give our customers more time and energy on product development instead of testing. Keystone has a full lab of test equipment which permits us to provide short lead times on scheduling. In addition to environmental 00-035 part 3 testing, Keystone has a full scope of expertise including sand and EMC/EMI, ingress protection, and package testing. 

Have a question about our DEF STAN 00-035 testing capabilities? Contact us to discuss the best course of action.

For more information on Defense Standard regulatory compliance testing, please follow the links below:



DEF STAN 00-035 Part 3: CHEMICAL