This SAE Recommended Practice sets forth a method for measuring pressure-induced separation in automotive sealers and determining the likelihood of equipment failure due to this separation, also known as "caking."

Background Sealers in automotive plants are generally transported and applied via airless pumping equipment whose internal pressures may exceed 20.7 MPa (3000 psi). Some sealers have a tendency to separate when exposed to pressures of this magnitude which results in varying degrees of system blockage.

This pressure-induced "caking," or blockage of the pump and transport lines, reduces sealer delivery rates and can completely shut down the system.

Separation tests run on sealers at 20.7 MPa (3000 psi), 25 °C (77 °F) for 72 h with measured separation volumes of over 6 mL have been known to cause "caking" problems in production pumping equipment whereas sealers with measured separation volumes of 3 mL or less have not caused this type of problem.

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