As biochar is adopted across a growing range of sectors, it is often described as a highly versatile material. That description is broadly true — but it is frequently misunderstood.
In practice, one biochar does not fit all applications.
At Carbon Gold, we have worked with biochar for almost two decades across soil and non-soil uses. Over that time, one consistent lesson has emerged: biochar performs very differently depending on how it is made, what it is made from, and where it is ultimately used.
Versatility is not the same as interchangeability
Biochar is now used in soil and growing systems, construction materials, industrial processes, and long-term carbon storage. Each of these uses places very different demands on the material.
Biochar designed for soil applications often prioritises:
- Interaction with soil biology
- Water retention and movement
- Long-term structural stability
By contrast, biochar used in materials such as asphalt, concrete, plasterboard, or aggregates must meet requirements around:
- Consistency
- Particle size
- Density
- Predictable behaviour within a manufactured system
Both uses are valid. They simply require different material characteristics.
Performance follows design choices
Differences in biochar performance are rarely accidental. They arise from deliberate decisions made throughout production.
These include:
- Feedstock selection
- Processing temperature and residence time
- Scale of production
- Post-processing and handling
Each decision influences the final properties of the biochar. As a result, biochar that performs well in one application will not automatically perform well in another.
Expecting a single biochar to satisfy all requirements often leads to compromise — affecting quality, consistency, or suitability.
Feedstock sets the ceiling
Across all applications, one principle remains constant: The quality of the input determines the quality of the output.
Feedstock consistency, composition, and availability place a natural ceiling on what a biochar can achieve. Low-cost or highly variable inputs rarely produce biochar capable of meeting tight performance or specification requirements, particularly outside of soil applications.
No amount of downstream validation or framework can fully compensate for this.
Proximity does not guarantee suitability
It is often assumed that biochar produced closer to its point of use is automatically the best option. In practice, this is not always the case.
UK-produced biochar can offer advantages in terms of distance and logistics. However, proximity alone does not determine suitability or performance. Feedstock availability, processing control, scale, and consistency all play a significant role in the quality of the final material.
In some cases, biochars produced further afield may offer:
- More consistent feedstock supply
- Greater control over processing conditions
- Properties better aligned with specific applications
When performance requirements are tight, particularly in non-soil applications, material suitability can outweigh simple measures of distance.
This does not mean local biochar lacks value.
It means application requirements should lead decision-making, rather than assumptions based on geography alone.
Optimisation always involves trade-offs
Biochar production requires balancing competing priorities.
Optimising for one outcome often means accepting limitations elsewhere. For example:
- Producing at high volume is not the same as producing consistently
- Maximising energy recovery can reduce biochar quality
- Designing for low cost can restrict performance or application range
Difficulties arise when these trade-offs are not fully recognised, or when a single biochar is expected to meet multiple, conflicting objectives at once.
Biochar is adaptable.
It is not limitless.
Designing biochar for use
Effective use of biochar starts with a clear understanding of its intended application. That understanding should inform decisions around feedstock, processing, quality control, and logistics from the outset.
Designing biochar first and then searching for suitable uses later often results in mismatches between material properties and application requirements.
When biochar is designed with use in mind, it becomes a functional material rather than a generic one. That is where it delivers the greatest value, both practically and environmentally.
A practical perspective
As biochar continues to move into new sectors, clarity around use, performance, and limitation becomes increasingly important. Experience shows that successful projects are those that respect biochar’s specificity rather than treating it as interchangeable.
Understanding this is not a barrier to innovation.
It is what allows biochar to work effectively in the real world.
