Slide fastener chain and slide fastener

A slide fastener chain, comprising:

• a pair of fastener tapes;
• and
• a plurality of elements fixed on each of opposing edge portions of the fastener tapes at a predetermined pitch;
• wherein the elements comprise a base portions fixed on the respective fastener tape and a head portion protruding from the base portion and configured to be engaged with the opposing elements, and
• wherein the elements have a thickness (t) and a pitch (p) satisfying the following equations:
• 0<t≦2.2 mm and 0<p≦3.5 mm, and
• wherein when the slide fastener chain with the elements engaged is bent in a front and back direction thereof at a middle portion thereof to form a loop portion and an overlap portion, the loop portion is pressed from above towards the overlap portion while fixing the overlap portion with a predetermined flexibility testing device, and a movable member of the predetermined flexibility testing device moves downward to a predetermined position, a maximum load (F) measured by the predetermined flexibility testing device within a moving range of the movable member satisfies the following equation:
• 0<F≦6.5 N.