MaxSil (retail cash price)
- Form
- Soil applied powder
- Plant available Si
- 36 kg/t (AAPFCO)
- Indicative cost per kg PAS (AUD)
- about $64
- The catch
- Wholesale volume pricing sits well below this
White label wholesale supply
The most plant available silicon you can put in a bag. Under your brand.
MaxSil supplies high PAS amorphous silica in bulk to fertiliser and agronomy companies who want a better silicon product without building a plant. Your label, our science, negotiable volume pricing.
- 36 kg PAS per tonne (AAPFCO method)
- 13 to 25x more plant available silicon than diatomite (Prof. Zed Rengel, UWA)
- Certified organic. 100% circular.
The fraction that matters
What plant available silicon actually is
Total silicon is not what a crop uses. Plants only take up silicon as monosilicic acid (orthosilicic acid, H4SiO4) dissolved in soil water. Most soils hold huge amounts of silicon locked in quartz and crystalline minerals that never dissolve fast enough to matter.
PAS is the fraction that releases into soil solution within a growing season, measured by the AAPFCO 5 day test (the US protocol for plant available silicon).
Stronger stands
Stronger cell walls and lodging resistance.
Stress tolerance
Tolerance of salt, drought and heat stress.
Crop resilience
Reduced pest and disease pressure.
Phosphorus availability
Improved phosphorus availability by displacing P fixed on soil particles.
Nutrient use efficiency
Better nutrient use efficiency. A grower managing 14,000 ha reported more than 40% urea reduction.
Grower experience is not a guaranteed outcome for every crop, soil or program.
From recovered glass to crop nutrition
How we convert glass into PAS
- 01
Feedstock
Post consumer glass recovered through container deposit schemes, diverted from landfill and processed under an EPA end of waste code.
- 02
Milling
Our patented process ball mills the glass to an ultrafine amorphous silica powder.
- 03
Surface area
Amorphous (non crystalline) silica with very high surface area dissolves far faster than crystalline silica, sand, slag or diatomite.
- 04
In the soil
The powder steadily releases monosilicic acid into soil water, the form roots take up, building a soil bank of silicon across the season rather than a one hit dose.
Patented IP. PAS independently verified (July 2023, AAPFCO method).
How MaxSil compares
Every silicon product is sold by the tonne or the litre. Price the part the plant uses and the picture changes.
| Product type | Form | Plant available Si | Indicative cost per kg PAS (AUD) | The catch |
|---|---|---|---|---|
| MaxSil (retail cash price) | Soil applied powder | 36 kg/t (AAPFCO) | about $64 | Wholesale volume pricing sits well below this |
| Calcium silicate slag | Soil applied | about 1.5 kg/t | $67 to $400 depending on price and freight | Tonnes per hectare to spread, heavy freight |
| Diatomite | Soil applied | about 1.5 kg/t (AAPFCO) | about $400 | Tonnes per hectare, slow release |
| Potassium silicate liquid | Foliar or fertigation | Fully soluble, 15 to 17% Si | $53 to $103 | pH 11 to 12, tank mix issues, repeat sprays every 2 to 4 weeks |
| Stabilised orthosilicic acid | Foliar liquid | Tiny dose products | Thousands of dollars per kg Si | Very high cost per kg of silicon |
| Wollastonite | Soil applied mineral | PAS not published | Not comparable | Limited supply in Australia |
Calcium silicate slag
- Form
- Soil applied
- Plant available Si
- about 1.5 kg/t
- Indicative cost per kg PAS (AUD)
- $67 to $400 depending on price and freight
- The catch
- Tonnes per hectare to spread, heavy freight
Diatomite
- Form
- Soil applied
- Plant available Si
- about 1.5 kg/t (AAPFCO)
- Indicative cost per kg PAS (AUD)
- about $400
- The catch
- Tonnes per hectare, slow release
Potassium silicate liquid
- Form
- Foliar or fertigation
- Plant available Si
- Fully soluble, 15 to 17% Si
- Indicative cost per kg PAS (AUD)
- $53 to $103
- The catch
- pH 11 to 12, tank mix issues, repeat sprays every 2 to 4 weeks
Stabilised orthosilicic acid
- Form
- Foliar liquid
- Plant available Si
- Tiny dose products
- Indicative cost per kg PAS (AUD)
- Thousands of dollars per kg Si
- The catch
- Very high cost per kg of silicon
Wollastonite
- Form
- Soil applied mineral
- Plant available Si
- PAS not published
- Indicative cost per kg PAS (AUD)
- Not comparable
- The catch
- Limited supply in Australia
Indicative figures from published retail prices and product labels, October 2026. Liquids count all silicon as plant available. Full comparison and test reports available on request.
Cost per hectare per season
about $166/ha
Potassium silicate orchard program
Over 6 passes
about $115/ha
MaxSil pasture
50 kg/ha, one pass
about $230/ha
MaxSil broadacre
100 kg/ha, one pass
At retail price. Different crops and programs are shown, not like for like crop trial results.
Why convert your range to MaxSil PAS
More PAS in your range
The highest PAS of the soil applied mineral silicon sources we tested.
One pass
One pass instead of a spray program.
Near neutral pH
Safe on alkaline and sodic soils.
Fits your formulations
Dry powder that blends into granules, prills, seed coats and NPK blends.
Why white label works for both of us
For you
- Your brand, your margin.
- A proven, independently tested product without building a plant.
- Use all of our science, trial data and claims in your own marketing.
- Secure supply at volume pricing.
- We help with distribution, freight and grower and agronomist education.
For us
- Volume through your existing channels and grower relationships.
- We stay focused on making the best PAS.
- Long term supply partnerships instead of competing for the same growers.
Confidential on both sides. We never disclose who we supply. You never need to disclose who makes it.
Wholesale terms
For fertiliser manufacturers, blenders, distributors and agronomy brands in Australia and overseas, including Saudi Arabia, UAE and Canada.
Volume
From trial pallets to 10,000+ tonnes a year.
Price
Negotiable, based on volume and term.
Forms
Bulk powder, bulka bags, custom blends or prills on request.
Support
Technical data pack, test reports, claims library and distribution help.
Sustainability
Silicon that used to be a bottle.
- Certified organic.
- 100% circular, made from recovered glass that would otherwise go to landfill.
- Produced under an EPA end of waste code.
- Far less freight per kg of PAS than slag or diatomite.
- Supports customers' Scope 3 and FLAG reporting.
SXC - Southern Cross Certified
Request wholesale pricing
Tell us what you sell and the volume you are looking at. We will come back with pricing and a sample.