When a blade is finished
Where the previous section dealt with the rubber — a component that degrades over months — the blade operates on another timescale. A good blade can last a decade or more. But it is not eternal, and the signs of exhaustion are subtler than a rubber's, precisely because the deterioration is slow and the player adapts without noticing.
The first sign, and the hardest to pin down objectively, is the loss of feel. Every blade transmits a characteristic vibration when it strikes the ball — the tactile feedback described in 11.1. Over the years the internal layers of adhesive fatigue, the fibres of the wood lose stiffness and that vibration fades. The bat begins to feel dull: the impact reaches the handle more damped, less defined. The player reads it as a rubber that needs changing or as a bad day, but if the sensation persists with new rubbers, the problem lies underneath.
The second sign is visual and mechanical: delamination. The plies that make up the blade — described in 8.1 — are bonded with adhesive that can give way through repeated impacts, changes of temperature or accumulated humidity. The classic symptom is an edge of the bat where two plies begin to separate, sometimes with a slight visible swelling. Delamination usually begins at the habitual impact area or at the edges, where the protection is least. Where it is incipient and confined to one edge, 13.9 describes possible repairs. Where it affects several areas or the central playing area, the structural integrity of the bat is compromised.
The third is warping. A healthy blade is flat; a fatigued one can curve slightly, above all if it has been exposed to unsuitable storage conditions — the humidity and temperature covered in 13.6. It is checked by resting the blade, stripped of rubbers, on a flat surface: if it rocks or does not settle evenly, there is a warp. A slight deformation may not affect play perceptibly. A curvature visible to the naked eye alters the effective angle of the rubber and produces inconsistencies the player notices without being able to identify.
Cracks in the surface of the blade are the most obvious sign. They appear almost always in the throat area — the transition between head and handle, where mechanical stresses concentrate — or in the handle itself, especially where it has taken knocks against the table. A surface crack is not necessarily terminal; a crack running through the plies is. The test is simple: press lightly with the thumb on either side of the crack. If the blade gives or creaks, the structure has lost its continuity.
Composite blades have a different pattern of ageing. Carbon, ALC or ZLC fibres — covered in 10.2 — do not fatigue at the same rate as natural wood, but the bond between the fibre layer and the adjacent wooden plies certainly can deteriorate. The result is a localised delamination that sometimes produces a hollow sound when the affected area is tapped with a knuckle, different from the firm, even sound of an intact blade.
Unlike a rubber, a blade is neither replaced often nor treated as a consumable. That is why the diagnosis matters more: declaring dead a blade that only needs an edge repaired is a costly mistake, but clinging to a structurally damaged one is a handicap no new rubber makes up for. When the vibration has faded, the plies are separating or the surface has lost its flatness, the blade has run its cycle. What the player notices then, mounting the same rubber on a new blade, is not that the rubber plays better but that the old blade had long since stopped responding.