ENGINEERING ANSWER
The dated data sheet used here reports typical moisture absorption of 0.06% after its stated immersion test on a 0.060-inch sample. Other Rogers resources may show different typical figures; retain the source and conditions rather than silently mixing them.
What to decide before release
Use the fabricator’s storage, packaging and bake guidance for the exact board construction. Moisture sensitivity of components and finishes is separate from laminate absorption. Record exposure history when investigating reflow defects.
Checks to put in your design brief
- Keep packaging and lot labels
- Follow a qualified bake procedure if required
- Compare data measured under matching conditions
Important distinction
A low absorption number does not mean assembled boards can be stored indefinitely in uncontrolled humidity.
Sources & basis
Material facts follow the cited source. Design checks are preliminary guidance, not supplier process instructions.