andro Rasanter R42 Review: What the Name Really Tells You
The andro Rasanter R42 is a spin-focused offensive rubber with a 42 degree sponge. That sentence is almost the whole specification. Because the Rasanter code is one of the few genuinely systematic naming schemes in table tennis.
There is also something odd about this rubber worth knowing upfront. Every review quotes speed and spin ratings for it. But andro does not publish any.
Short answer: R42 means rotation-focused pimples on a 42 degree sponge, which is medium hardness. It is aimed at advanced players who want grip above all. It is not sold on Amazon, though Megaspin lists it at $39.95 in the US, reduced from $51.95, with 4.5 stars from 51 reviews. If you want the same geometry in a harder sponge, R47 is the common step up.
Table of Contents
How the andro Rasanter Naming System Works
Most rubber names tell you nothing. Rasanter names tell you two specific things, and once you know the rule the whole range becomes readable.
The letter is the pimple geometry, which sets what the rubber is for. R stands for rotation. Those sheets use thicker, tightly packed pimples that maximise contact with the ball. So they grip and spin. Then V stands for velocity, with smaller and more widely spaced pimples for catapult, giving flatter and faster play. And C stands for counterspin, where a built-in damper kills incoming topspin.
The number is the sponge hardness in degrees. So R42 has a 42 degree sponge. R37 is softer. R53 is much harder. The number is not a model generation or a marketing tier.
💡 Pro tip: This makes cross-shopping unusually easy. If you know you get on with a 42 degree sponge but want a flatter trajectory, V42 gives you the same hardness with different pimples. Almost no other brand lets you hold one variable steady like that.
Why Rasanter R42 Speed and Spin Ratings Disagree
Search for this rubber and you will find confident numbers. Speed 95, spin 96, control 69 on one US retailer. Speed 117, spin 126, control 88 circulating elsewhere. Both look authoritative.
But andro’s own product page carries no speed, spin or control rating at all. It gives sponge hardness, thickness options, the TENSOR and Energy Cell technologies, and a description of the intended player. That is it. A second European retailer checked for this review also publishes no ratings.
This is not unique to andro. But it is unusually stark here. Retailer rating systems are built in-house, to help shoppers compare within that one shop. They are not measurements. So a number above 100 is not an error. It just means the shop uses a scale that runs past 100.
⚠️ Watch out: The practical rule is to compare ratings only within a single source. Two rubbers rated by the same retailer can be compared against each other. The same rubber rated by two retailers cannot, and neither can a Butterfly in-house figure against a degree measurement.
What Is Actually Verified About the Rasanter R42
andro describes the design intent plainly enough. The topspin potential of the surface rubber is combined with a medium soft sponge, which they say guarantees the best feedback and control. So the sheet is built to grip first and generate speed second.
What a 42 Degree Sponge Feels Like
Degrees only mean something in context. So here is the range. Below about 40 degrees is soft. The low to mid 40s is medium. Then approaching 50 is hard. Above that is very hard, and mostly used by advanced players with fast swings.
At 42, the R42 sits at the softer end of medium. andro themselves call it a medium soft sponge. So it compresses more readily than a 47 or a 50, which means more dwell time and more feedback at slower speeds.
So it suits a spin-first game. A softer sponge lets the ball sink in slightly before the topsheet grips and throws it. But a harder sponge rewards a faster swing, and punishes a slow one.
📊 Note: One cross-scale caution. Chinese manufacturers use a different hardness scale from the European one, and the same sponge reads several degrees lower on it. So a European 42 is not comparable with a Chinese 42, which is another reason to compare hardness only within a single measuring system.
Where to Buy the Rasanter R42
This is the awkward part. Searching Amazon for Rasanter R42 does not return it. The results fill with R47 and R48 listings, plus unrelated budget rubbers, but the R42 itself is absent.
In the US it is stocked by specialist retailers. Megaspin lists it at $39.95, reduced from $51.95, in red and black across 1.7mm, 2.0mm and Ultramax. Red in 1.7mm was out of stock when checked. On andro’s own European site it carries a list price of €56.95.
So if a review points you at Amazon for this rubber, check what you are adding to the basket. R42 and R47 are five degrees apart. That is a real difference in feel, rather than a variant of the same thing.
Who the Rasanter R42 Suits
andro aims this at advanced to high level players who want maximum grip. That is a narrower target than most rubber marketing admits to, and it is worth taking seriously.
- ✓You loop consistently and want grip as the priority
- ✓You prefer a medium soft sponge with plenty of feedback
- ✓You want to compare hardness against other degree-rated rubbers
- ✓You like being able to change one variable at a time within a range
- ✕You are a beginner, since this is aimed well above that level
- ✕You want flat, fast, direct play, where the V series fits better
- ✕You need to buy from Amazon, where this model is not listed
- ✕You want published speed and spin ratings, because andro gives none
How to Pick Your Rasanter Hardness
The R series holds the pimple geometry constant and varies only the sponge. So it gives you a rare chance to choose hardness on its own merits, without changing anything else. Here is how to think about it.
The governing variable is swing speed. A sponge only works if you compress it. So a hard sponge needs a fast swing. But a soft sponge compresses readily. That helps a slower swing, though it can feel mushy under a fast one.
There is a common mistake worth naming. Players often buy harder rubber, believing it is more advanced. But a hard sponge you cannot compress is slower than a medium one you can. So you end up with less speed, not more. And less feel too.
💡 Pro tip: If you are unsure between two hardnesses, put the harder sheet on the forehand and the softer on the backhand. The forehand usually swings faster. Also, that setup teaches you directly which one you prefer, at the cost of a single sheet.
Energy Cell, TENSOR and Ultramax Explained
andro attaches three terms to this rubber, and none of them are obvious from the packaging.
TENSOR describes the topsheet being held under tension during manufacture. That built-in tension is what gives speed without the player adding anything. It is also why the sheet slowly loses performance from the day it is made, whether you use it or not.
Energy Cell is andro’s name for the sponge across the Rasanter range. Every Rasanter uses it, which is precisely why the hardness number is the meaningful variable between models. The sponge material stays the same. Only its firmness changes.
Ultramax is the thickness. The legal maximum for sponge and topsheet together is 4mm. So Ultramax takes the sponge as close to that ceiling as the topsheet allows. It is the most sponge you can legally have, rather than a separate product.
📊 Note: Because Energy Cell is common to the whole range, comparing two Rasanters really is comparing one variable. That is unusual. Most brands change sponge formulation and pimple geometry together, which makes their model differences much harder to reason about.
Gluing and Looking After a Rasanter Sheet
The R42 is sold as a bare sheet, so you glue it to your own blade. Water-based glue is the standard, and it is what tournament rules expect.
- Thin coats on both surfaces. One on the sponge, one on the blade. Thick glue adds weight and dries unevenly.
- Wait for touch-dry. The glue should feel dry to a fingertip, not tacky. Rushing this traps solvent and weakens the bond.
- Lay it from one edge. Roll the sheet down rather than dropping it flat, which is how air bubbles get trapped.
- Trim once set, with a fresh blade against the wood edge. A ragged trim catches in bat cases and starts a corner lifting.
For care, the topsheet is what you can protect. Grip is the property you bought, and grip goes as dust builds and the surface oxidises. So clean it with a proper rubber cleaner after sessions, use protective film between them, and keep the bat out of heat.
⚠️ Watch out: Boosters and tuners are prohibited under ITTF rules. They work by artificially increasing sponge tension, which is exactly what racket control at a tournament is checking for. A boosted sheet can fail inspection even if it plays beautifully.
Knowing When the Sheet Is Done
A tensor rubber fades rather than fails. So players routinely carry on with a dead sheet without noticing the decline.
The visual sign is the topsheet going matte where you contact the ball most. A fresh sheet has an even sheen across the face. But a worn one develops a duller patch, usually slightly off-centre toward your natural contact point.
The playing sign shows up on heavy backspin returns first. That shot has the least margin, so it is where lost grip bites soonest. If serves you used to read are suddenly finding the net, check the rubber before rebuilding your technique.
Pairing the Rasanter R42 With a Blade
andro does not prescribe a blade, which is normal outside the Butterfly ecosystem. But the sponge hardness points you in a sensible direction.
At 42 degrees the R42 is medium soft. So it pairs naturally with an offensive wood blade, where the blade supplies flex and the rubber supplies grip. That combination keeps plenty of feel at slow speeds, which matters for the short game.
Putting it on a stiff carbon blade also works, though it changes the character. The blade then supplies the speed and the rubber supplies the spin. Some players want exactly that split. But you lose some of the feedback that a softer sponge on a flexier blade gives you.
There is one combination worth avoiding while you are still deciding. A very soft sponge on a very flexible blade produces a setup with lots of feel and very little pace. It feels lovely in warm-ups. Then it leaves you unable to finish a point.
💡 Pro tip: Change one thing at a time. If you are moving to the R42 from a different rubber, keep your existing blade for a few sessions first. Otherwise you cannot tell which component caused the change you are feeling.
andro Rasanter R42 Questions, Answered
What does the 42 in Rasanter R42 mean?
It is the sponge hardness in degrees. R42 has a 42 degree sponge, R47 has a 47 degree sponge, and so on through the range from R37 to R53.
What does the R in Rasanter R42 stand for?
Rotation. The R series uses thicker, tightly arranged pimples that maximise contact with the ball for grip and spin. V stands for velocity and uses smaller, more spaced pimples for catapult, while C stands for counterspin and includes a damper.
What are the speed and spin ratings of the Rasanter R42?
andro does not publish any. Retailers quote their own figures, and they disagree substantially: one US shop lists speed 95 and spin 96, while other sources circulate speed 117 and spin 126. Treat all of them as estimates rather than specifications.
How much does the andro Rasanter R42 cost?
In the US it was $39.95 at Megaspin, reduced from $51.95. On andro’s own European site the list price is 56.95 euro. It is not sold on Amazon.
Is the Rasanter R42 good for beginners?
No. andro aims it at advanced to high level players. A beginner is better served by a slower, more controllable rubber while stroke technique is still developing.
What is the difference between Rasanter R42 and R47?
Five degrees of sponge hardness. Both use the same rotation-focused pimple geometry, so R47 is the firmer sheet, which suits a faster swing, while R42 offers more dwell time and feedback.
What thicknesses does the Rasanter R42 come in?
andro lists 1.7mm and 2.0mm, with the 2.0mm sold as Ultramax. Retailers typically stock 1.7mm, 2.0mm and Ultramax in both red and black.
Is the Rasanter R42 available on Amazon?
No. Searching returns Rasanter R47 and R48 listings along with unrelated rubbers, but not the R42. In the US it is carried by specialist table tennis retailers.
The Verdict on the andro Rasanter R42
- →R means rotation and 42 means a 42 degree sponge. The name is the specification.
- →andro publishes no speed or spin ratings. Every number you see quoted is a retailer’s own estimate.
- →It is aimed at advanced players who want grip, not at improvers.
- →US price was $39.95 at Megaspin, reduced from $51.95, with 4.5 stars from 51 reviews.
- →It is not on Amazon, so check you are not buying R47 by mistake.
The Rasanter range is the most legible naming system in table tennis. So the R42 is a straightforward proposition within it. You are buying rotation-focused pimples on a medium soft sponge. But you are not buying the speed and spin figures printed alongside it. Because andro never issued them.
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