Is Tofu Cat Litter Safe? A Guide for Singapore Cat Owners

Written by the Kopipets team · Singapore · First published 24 July 2026 · Substantially revised and re-checked 31 July 2026
We sell tofu cat litter, so read this with that in mind. We have written it so the test is one you can apply to any brand, including ours.

The short answer is that "tofu litter" is not one product, and safety is not a property of the category. It is decided by what the manufacturer used to hold the pellet together. A well-made tofu litter is one of the gentler things you can put in a litter box; a badly made one can carry formaldehyde from an industrial adhesive binder. Both are sold in Singapore, both are labelled "natural", and you cannot tell them apart by looking at the bag.

So the useful question is not "is tofu litter safe" — it is "how do I check whether this particular bag is?" That has an answer, it is short, and it works on any brand.

Where the actual risk is: the binder

Tofu litter is made from the fibrous pulp left over after soy or pea processing. That pulp is dried and extruded into pellets, and something has to hold the pellet together. Done properly, the binder is food-industry material — starch, guar gum, sodium carboxymethyl cellulose — which clumps when it gets wet.

Done cheaply, the binder can be an adhesive from the particleboard and plywood industry, built on urea-formaldehyde or phenol-formaldehyde resin. That is where formaldehyde enters a product otherwise made of vegetable matter. It is the one genuinely safety-critical variable in this category, and it is invisible: the pellets look identical either way. It is also why "made from natural plant fibre" tells you nothing on its own — the fibre was never the question.

This matters more in Singapore than it does in a dry climate. Urea-formaldehyde bonds hydrolyse in the presence of water, and the rate rises with heat and humidity. A flat here sits at roughly 30°C and 80% relative humidity most of the year. We cannot give you a number for how much difference that makes and we would not trust anyone who offers one, but the direction is not in dispute. We have written the full version of that argument — the chemistry, where the limit comes from, and how to read a laboratory report properly — in a separate article on formaldehyde in cat litter. This page is the overview; that one is the layer underneath it.

There is an industry specification for tofu cat litter, T/CIQA 11-2020, which sets a formaldehyde limit of 1.5 mg/kg, and grades dust in three bands rather than setting a single limit, along with requirements for clumping and heavy metals. Any manufacturer taking the category seriously will have had their product tested against it by an accredited laboratory. If a seller cannot produce that report, you have learnt something.

The four numbers to ask for

Three things to check about any report you are shown.

Who did the test — an accredited third-party laboratory, not the factory's own quality department. Whether you can verify it — a real report carries a report number you can look up in the issuing laboratory's own records, which a PDF emailed to you does not prove on its own. And what the detection limit was — this is the one almost everyone skips. "Not detected" means below the level that method could see. A method that can see down to 0.1 mg/kg and a method that can only see down to 1.0 mg/kg will both print "not detected" on the same sample, and they are not saying the same thing.

What our litter measured

Our tofu litter was tested in April–May 2025 by CTI, a laboratory accredited to ISO/IEC 17025 and operating under the ILAC Mutual Recognition Arrangement, against T/CIQA 11-2020, under report number A2250276330101001C. These are the items that answer the four questions above:

Note the wording on the first row. "Contains no formaldehyde" is a claim; "not detected below 0.1 mg/kg by an accredited laboratory" is a measurement. They are not the same sentence, and the difference is the entire point of this article. Hold us to the second one.

The full report is published here — all 17 items, including the ones that are merely good rather than impressive, with the laboratory's name, the report number and the verification code so you can check it against the lab's own records instead of taking our word for it.

These figures describe the batch that was submitted in 2025. Ask any brand, including us, when their most recent test was done and whether the formula has changed since — a five-year-old report on a reformulated product is worth nothing. When we re-test, the new report will go on that page next to the old one rather than replacing it.

What we do not claim about our own binder

We have told you that a starch binder is the good outcome and an adhesive binder is the bad one. The obvious next question is which one we use.

We believe ours is starch-based. We have not yet received that in writing from the manufacturer with a specification attached, and until we have, it is a thing we have been told rather than a thing we know. So we are not going to put it on this page as a fact. When the written specification arrives it goes on the test report page, and if it turns out we were wrong about it, that goes there too.

What we can point at in the meantime is the measurement: formaldehyde not detected at a detection limit of 0.1 mg/kg, against a 1.5 mg/kg standard limit, by a named laboratory under a checkable report number. That is a weaker statement than "our binder is starch", and it is the strongest one we are entitled to make.

What happened when forty litters were tested by someone with nothing to sell

Our own report is a report we paid for. Here is one we did not.

In November 2025, four consumer councils — Macau, Shenzhen, Zhongshan and Guang'an — jointly ran a comparative test on 40 cat litter products across mineral, tofu, bentonite and mixed categories, on nine indicators. On the three safety indicators, arsenic, lead and formaldehyde, all forty samples met the applicable standards.

We are including that because it cuts against our own interest in scaring you. The most likely outcome when a mainstream cat litter is tested is that it passes. The binder problem is real, it is worth checking once when you decide which manufacturer to trust, and it is not an epidemic.

Where the forty products separated was on dust. Powder content ranged from 0.05% to 3.48% — a factor of seventy between the cleanest and the dustiest — and pulverisation rate from 0.28% to 1.20%, meaning the dustiest product in the set was above even the loosest band in the tofu-litter specification. Every one of those products was, equally, "safe". They were not remotely equal to live with. That is the honest proportion: formaldehyde is a one-time check on the manufacturer, dust is the thing you handle every day.

Kittens, and what happens if a cat swallows a pellet

This is the question we get most often, and it deserves a more careful answer than the one most listings give.

Kittens explore with their mouths. The relevant difference between litter types is what a swallowed pellet does next. Bentonite clay absorbs many times its own weight in water and swells — that is exactly the property that makes it clump so well, and it is why an ingested clay clump is a genuine veterinary problem. Tofu litter contains no clay and does not swell that way; a pellet that goes down passes through. That mechanical difference is the reason vets and shelter volunteers here tend to steer kitten households towards tofu litter rather than clay.

That is not the same as saying it is safe to eat, and we are not going to tell you it is. Litter is not food. More importantly: a cat that is eating litter rather than using it is telling you something. Repeated litter eating is a recognised clinical sign — it can point to pica, anaemia, or a gap in the diet — and it needs a vet, not a different brand of litter. Any seller who answers that worry with "don't worry, ours is safe if swallowed" is doing you a disservice.

Dust, and why the number matters more than the adjective

Every tofu litter in Singapore is advertised as low-dust or dust-free. No litter made of dried plant fibre is dust-free — pour any of them into a tray in sunlight and you will see it. We have used absolute dust wording ourselves on packaging that is still in circulation, and we are in the middle of correcting it. It was wrong when we wrote it.

What can be measured is how much. Ours came back at 0.66% powder content and a 0.36% pulverisation rate. T/CIQA 11-2020 does not set one limit for either figure; it sets three bands. For powder content they are 0.5% for premium, 1% for first grade and 1.5% for conforming. For pulverisation rate they are 0.5%, 0.8% and 1%. That puts our pulverisation rate in the premium band and our powder content in the first-grade band, one below premium. Pulverisation rate reflects the formulation and the hardness of the pellet; powder content reflects how well the factory screens and finishes the product. We quoted both figures against the loosest of the three bands for months before setting this out properly. We would rather print those two figures than the word "dust-free", because you can check a figure and you cannot check an adjective. If dust is your main reason for switching — an asthmatic cat, an asthmatic person, a small unventilated HDB bathroom — ask for the number and compare it against the 0.05% to 3.48% range that the four-council test found. Anyone who has tested will have their figure.

Flushing it in Singapore: be more careful than the bag suggests

Tofu pellets disintegrate in water in under a minute, so "flushable" is technically accurate. We would still qualify it in three ways specific to living here.

Plumbing. Older HDB stacks and any slow-draining toilet do not cope well with repeated clumps of fibrous material. One clump at a time on a full flush is fine; emptying a whole scoop is how people end up calling a plumber.

Toxoplasma. Cat faeces can carry Toxoplasma gondii, and wastewater treatment does not reliably destroy the oocysts. Public health guidance in most countries advises against flushing cat faeces at all — and that holds no matter what the litter is made of.

Pregnancy and immunocompromise. If anyone in the household is pregnant or immunocompromised, they should not be handling litter waste at all if it can be avoided. That is standard obstetric advice, not a marketing line.

Our actual recommendation: flush the urine clumps if your plumbing is healthy, one at a time. Bag the faeces and send it down the chute.

The downside we would rather you heard from us

Tofu litter and Singapore humidity are not friends. An opened bag left in a bathroom or an open service yard softens within weeks — the pellets go slightly spongy and stop clumping crisply. Store the open bag sealed and indoors.

The same humidity is why the mould figure above is worth asking about, and why the age of the stock matters as much as the test result. A laboratory result describes a fresh sample; it says nothing about a bag that has sat in an un-airconditioned warehouse for a year. Check the production date on any bag you buy, from anyone, including us.

Getting the best out of it

• Use a deep bed. At least 5cm. A plant binder needs depth to form a clump that holds together — a shallow bed is the single most common reason people conclude tofu litter "doesn't clump".
• Give it 10 to 20 seconds. Plant binders set more slowly than clay, which grabs on contact. Scooping too early breaks the clump.
• Scoop daily. A fine-mesh litter scoop makes this quicker and loses less clean litter.
• Deal with ammonia at the source. A fragrance-free baking soda deodoriser mixed into the bed works better in humid weather than a perfumed litter, which many cats simply refuse.
• Contain the scatter. An enclosed litter box cuts consumption noticeably, because far less litter gets kicked onto the floor.
• Switch gradually. Mix the new litter in over about a week. A cat that rejects a litter will find somewhere else to go.

Where we could be wrong

We are a pet supplies retailer. We are not veterinarians, toxicologists or a laboratory, and nothing on this page is veterinary advice. If your cat has a respiratory condition or a history of eating things it should not, ask your vet before changing litter, not us.

Three specific limits on what we have told you. T/CIQA 11-2020 is a Chinese association standard with no legal force in Singapore — we use it because it is the most specific published benchmark that exists for this product type, not because it binds anyone here. A content limit in mg/kg is not an air-exposure limit, so we cannot tell you what any of these figures mean for the air in your flat, and we will not guess. And our own report covers samples submitted in 2025; it is strong evidence about how the product is made and weak evidence about a bag manufactured three years from now.

If you find an error on this page, or a source that contradicts it, we would rather hear about it than not.

Frequently asked questions

Is tofu cat litter safe for cats?

It depends on the binder, not on the category. Tofu litter made with a starch binder is among the gentler litters available; one made with an industrial adhesive can carry formaldehyde. The way to tell them apart is a formaldehyde result from an accredited laboratory — the industry limit is 1.5 mg/kg under T/CIQA 11-2020. Ask for the report before you decide, whichever brand you are looking at.

Is tofu cat litter safe for kittens?

It is usually the litter vets prefer for kitten households, because it contains no clay that would swell in the gut if a pellet were swallowed. That is a mechanical difference, not a licence to treat litter as harmless. Litter is not food, and a kitten that is eating it rather than using it should see a vet — repeated litter eating is a sign of pica or a dietary gap, and changing brands will not fix it.

Does tofu cat litter contain formaldehyde?

Some does, because some manufacturers use an industrial adhesive as the binder rather than starch. It cannot be judged by eye. The industry limit is 1.5 mg/kg under T/CIQA 11-2020; our own litter was measured at not detected, below 0.1 mg/kg, by CTI under report A2250276330101001C, and the full report is published on our site with the report number so it can be verified independently.

How do I read a cat litter test report?

Five questions decide whether a report means anything: which standard was used and what the limit is, whether there is a report number the laboratory can confirm, what the detection limit was, what date and which batch was tested, and how many items were tested and whether all of them are shown. We work through each one, with examples, in our article on formaldehyde in cat litter.

How dusty is tofu cat litter?

Not dust-free — no dried plant-fibre litter is. We are often asked whether tofu litter is less dusty than bentonite; we have no side-by-side measurement, and the standard we test against covers tofu litter only, so we will not claim a category winner. What matters is the measured powder content, and the industry specification grades it in three bands rather than setting a single limit. Ours tested at 0.66% powder content, which is first grade rather than premium against T/CIQA 11-2020's three bands, and 0.36% pulverisation rate, which is premium. For scale, a four-council comparative test of 40 litters published in November 2025 found powder content ranging from 0.05% to 3.48%. Ask any brand for their figure rather than accepting the phrase "low dust".

Can I flush tofu cat litter down the toilet in Singapore?

Urine clumps, one at a time, on a full flush, if your plumbing is in good order. Not whole scoops, and not faeces — cat faeces can carry Toxoplasma gondii, which wastewater treatment does not reliably destroy, so public health guidance advises against flushing it regardless of the litter type. Bag the faeces and use the chute.

Does tofu litter go bad in Singapore's humidity?

An opened bag stored in a bathroom or an open service yard will soften within weeks and clump less well. Keep it sealed and indoors. Because the raw material is plant fibre, the age of the stock matters as much as the test result — a laboratory report describes a fresh sample, not a bag that has been in a warehouse for a year. Check the production date.

How much tofu litter does one cat use per month?

Filling a box from empty takes about three 7L packs. After that, roughly two packs a month with 1.5mm fine pellets, or closer to three with coarser 2mm pellets, because coarse litter loses more clean material with every scoop. Our buyer's guide works the arithmetic through properly, including how to compare prices per kilogram rather than per pack.

About us

Kopipets is a Singapore pet supplies brand for cats and dogs, operated by Surplus Media Pte. Ltd. (UEN 202448810R), a Singapore-registered company and the importer of record for the products we sell. We hold our own stock in a local warehouse, inspect it on arrival, and deliver islandwide with our own fleet.

We sell Kopipets Tofu Cat Litter in 7L / 2.1kg packs, 1.5mm fine pellet, in Original and Charcoal. The full 17-item laboratory report is published on this site. Our buyer's guide covers price per kilogram, pellet size and monthly cost — including where a cheaper litter beats ours — and our article on formaldehyde in cat litter goes through the chemistry and the report-reading in full.