Table Tennis rubber weight
In my experience, the weight of my TT bat is directly related to the quality of my shot-making.
When I use the term bat, I'm referring to a blade w/o rubber. I prefer blade weight between 85-90 grams.
There's a great deal of physics involved in the energy or power of the swing, and the weight of the bat is definitely a factor. A math model of the swing will clearly show the difference in swing speed and force applied at contact, when bats of different weight are used.
Swing variables are also integral in the equation. Some players swing with little bend in the elbow and little snap of the wrist, which is really more characteristic of a tennis swing than a TT swing. Some players bend the elbow more freely. Some use a great deal of elbow bend and wrist snap - whatever is necessary for their shot-making. For those using more bend and snap, the speed at the business end of the paddle at contact (with the ball) is faster than at any other point along the line from the shoulder to the hand. It's kind of like a coiled spring. Hold fast to one end and give the other end a whack. The free end travels much more freely (quickly) than at any other point along the spring. A heavier blade will travel faster than a light blade, and contact the ball with more force, for those who hold the paddle lightly, and use a snap from the elbow through the wrist. When pushing and blocking no snap is typically used, so I'm talking about highly offensive looping and smashing swings, with regard to the effect blade weight has on the swing and at the point of contact with the ball.
I recently decided to give a lighter blade (78 grams) a try, using my tried and true Mark V rubber. The wood was the same density as that of my heavier blade, but fewer plies were used. Sure enough, I was forced to swing more aggressively to get the power and distance provided by my heavier blade with less effort. As a result, having to use more energy had a negative effect on control.
I've been playing for 40 years, so I've become settled in my swing, in how loosely I hold the handle, and the rubber I use, all of which are constants. This is how I was able to judge the effect of bat weight independently from other variables.