# Rubber - Dry Rubber Content

> Dry rubber content (DRC) measurement at point of purchase - enabling transparent, data-driven pricing between smallholders and processors.

- Canonical URL: https://spectrify.ai/research-pipeline/rubber

- Sector: Sector 01 · Food & Agriculture
- Status: Awaiting Response
- Tags: NIR, Rubber, DRC, Smallholder, Price Fairness

Dry rubber content (DRC) is the fundamental quality and pricing basis for field latex and cup lump rubber at the point of purchase from smallholders. DRC determination by the standard ASTM D3040 gravimetric method requires drying and weighing - a process that takes hours and is typically done by the processor, not the smallholder. This information asymmetry means smallholders often accept prices based on the processor's unverifiable DRC estimate. NIR-based rapid DRC measurement at collection points could rebalance this dynamic.

## What We've Established

### NIR Sensitivity to Dry Rubber Content

The rubber hydrocarbon backbone (C–H stretching overtones) produces strong and characteristic NIR absorption. DRC in field latex is essentially measuring the ratio of rubber polymer to water and serum, both of which have strong and separable NIR signals. Published research confirms NIR-DRC calibration performance equivalent to the gravimetric reference method.

### Social Impact Dimension

Beyond the technical measurement, this project has a clear social impact angle: transparent, independent DRC measurement at the point of sale addresses a documented price fairness problem for smallholder rubber farmers across Sri Lanka and the region. This framing resonates with development finance and impact investment partners.

## Technical Approach

NIR diffuse reflectance or transflectance measurement on cup lump rubber samples or fresh latex (depending on practical constraints at collection points). PLS-R calibration against ASTM D3040 gravimetric reference DRC. Requires samples spanning the practical DRC range (typically 40–65% for cup lump) from diverse estate and smallholder sources.

## Where We Stand

Outreach to rubber processor and smallholder organisation contacts has been completed. Awaiting confirmed response and discussion of data collection access.

## Next Steps

- Confirm partner engagement from processor or smallholder organisation
- Design portable sample presentation protocol compatible with field collection conditions
- Collect initial calibration samples across the operational DRC range

## Related Projects

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- [Coffee - Green Bean Moisture](https://spectrify.ai/research-pipeline/coffee-green-bean-moisture) (Emails Sent): MC analysis for green coffee beans - the critical pre-roast quality checkpoint. Questionnaire distributed to target roasters and exporters.

[Research Pipeline](https://spectrify.ai/research-pipeline)