SIO-2
SIO-2 offers 1 product on RevWix across Arts & Crafts, with an average ethics score of 82/10 and recurring certifications including ACMI AP Non-Toxic, EN 71-3 Compliant.
Standards & certifications
Verified credentials appearing across SIO-2's product range.
Ethics breakdown
Average scores across our scoring pillars.
- Animal Welfare90/10
- Labor88/10
- Environment82/10
- Sourcing80/10
- Transparency75/10
Categories covered
Where SIO-2 shows up across our directory.
- Arts & Crafts1
What reviewers highlight
Strengths mentioned most often across SIO-2's products.
- ✓Authentic mineral clay texture suitable for throwing on a wheel or hand-building
- ✓Reinforced with natural plant cellulose to reduce shrinkage and cracking
- ✓Non-toxic formulation certified by ACMI AP and compliant with EN 71-3
- ✓Can be air dried without heat or fired in a ceramic kiln up to Cone 06
Sustainability commitments
"Produced by Ceràmica Collet S.A. in Barcelona, Spain, adhering to stringent EU labor protections and industrial emissions standards. The inclusion of plant-derived cellulose eliminates the need for petroleum-based polymer binders commonly found in craft modeling clays."
SIO-2 scores & reviews
Product scorecard
| # | Product | Ethics | Shopper rating | Price |
|---|---|---|---|---|
| 1 | PLUS Air Dry Natural Clay | 82 | 4.6(1,240) | $12.95 |
Products from SIO-2
The SIO-2 PLUS is a professional natural air dry clay engineered for sculptors, educators, and crafters wanting authentic ceramic feel without kiln firing. Manufactured in Spain by Ceràmica Collet, this mineral-rich earthenware body is reinforced with natural cellulose fibers for structural stability. It behaves like traditional pottery clay, dries hard at room temperature, and remains completely non-toxic.
How to read SIO-2's ethics scores
Each SIO-2 product on this page carries a 0–100 score built from four checkable inputs: active third-party certifications, disclosed ingredients or materials, published supply-chain information, and the brand's watchdog record. Nothing here is based on SIO-2's own marketing language.
The spread matters as much as the top score. If SIO-2's highest and lowest products sit far apart, verification is being applied to some lines and not others — common when a company certifies a flagship range and leaves the rest undocumented. A narrow spread, even at a moderate average, usually signals a consistent policy.
Scores can move without any editorial change, because certification status is re-checked as pages refresh. A lapsed certificate, a new audit or a recall notice will all show up in the product's certification and notes sections.
Questions worth asking before buying SIO-2
Start with ownership: a parent company's testing or sourcing policy can change what a claim on the packaging actually covers. Then check scope — a certification often applies to one fibre, facility or ingredient rather than the whole product.
Finally, compare within the category rather than against SIO-2's own range. A mid-scoring product can still be the strongest verified option at its price, and a high-scoring one can be beaten by a cheaper certified alternative.
What each score input covers
| Input | What we check | Why it matters |
|---|---|---|
| Certifications | Active listings in public registers, with scope and expiry | Only externally audited claims can be revoked |
| Ingredients & materials | Full disclosure, hazard flags, recycled or organic content | Comparable without trusting brand narrative |
| Transparency | Named suppliers, factories or audit summaries | Shows whether claims survive scrutiny |
| Record | Recalls, regulator rulings and greenwashing findings | Best short-term signal of quality control |
Buying SIO-2 with confidence
- Verify the mark, not the adjectiveSearch the certifier's register for the exact product line.
- Check the parent companyOwnership changes what cruelty-free or organic claims cover.
- Compare in-categoryThe same score means different things across categories.
- Read open notes firstAn unresolved recall outweighs a few score points.
Frequently asked
Is SIO-2 an ethical brand?+
SIO-2's standing here is the average of its scored products, built only from verifiable inputs: active certifications, disclosed ingredients or materials, published supply-chain data and its recall or regulator record. Where a claim cannot be checked in a public register, it earns nothing.
Is SIO-2 certified by third parties?+
Any certification we could confirm appears on the individual product cards above. Marks shown are matched to the certifier's own register; self-declared logos and internal awards are not counted.
Why do SIO-2 products have different scores?+
Scores are per product, not per brand. Differences usually come from certification scope, ingredient or material disclosure, and packaging — a certified flagship can sit far above an undocumented line from the same company.
Are there better alternatives to SIO-2?+
Compare within the category rather than the brand: category rankings list the highest-scoring verified options at each price level, so you can see whether a cheaper certified alternative beats the SIO-2 product you were considering.