This SAE Recommended Practice sets forth a method for measuring pressure-induced separation inautomotive sealers and determining the likelihood of equipment failure due to this separation, also known as"caking."1.1 Background—Sealers in automotive plants are generally transported and applied via airless pumpingequipment whose internal pressures may exceed 20.7 MPa (3000 psi). Some sealers have a tendency toseparate 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 andcan completely shut down the system.