Rothermel Associates bonding method also results in polished grooves and internal features which allows clarity for inspection, better laminar flow and easier to clean channels. Polished grooves, and internal features Low temperature bonding never distorts internal features. This allows for tight tolerances. Good bond strength but requires critical surface tolerances, temperature control, and bonding pressures which, if done improperly, can delaminate the plastic over time. Internal features deform during high temperature bonding.
Internal features retain their unpolished nature or machine marks.
Fair bond strength but can delaminate due to some chemicals that attack the glue joints. Excess adhesive often extrudes into internal features. Lack of adhesive can produce weak spots between layers. Variations in adhesive thickness results in poor overall part thickness tolerance control. Internal features retain their unpolished nature or machine marks.