Readily burstable slide fastener

A readily burstable slide fastener comprising:

• a first stringer,
• a second stringer and
• a slider,
• each stringer being comprised of a tape and first coupling elements mounted on an edge of the tape, the slider being slidable mounted on the second stringer and slidable along the first coupling elements of the first and second stringers to engage the first coupling elements as it moves from a bottom of the slide fastener to a top of the slide fastener,
• wherein guide elements are provided on the tapes at a first position along the slide fastener, the guide elements on one tape not being engageable with opposed elements on the other tape, wherein locking elements are provided at the ends of the guide elements, the locking elements in use inhibiting separation of the first and second stringers, so that when a bursting force is applied at the first position in a first direction substantially perpendicular to the plane in which the first coupling elements lie at the first position, the locking elements and first coupling elements adjacent to the first position are disengaged.