# Polymer Matrix Demand

> Mercury supplies aggregate. Venus supplies binder. Together they make the swarm.

## Why slime, why Venus

Mercury feedstock = silicate + metal + ~zero carbon. Every swarm structure is a composite. Composites need a polymer binder. The binder needs carbon. Mercury can't supply it. Venus's atmosphere can.

This makes Venus's slime industry the **carbon supply chain** for inner-system construction. Not an edge industry — a load-bearing one.

## Matrix fraction by end product

| Product | Matrix % by mass |
|---|---|
| Statite mirror film | 60–80% |
| Solar-sail dispersal hardware | 50–70% |
| Radiator panel skins | 25–35% |
| Heavy structural megastructure | 20–30% |
| Beaming-optics support frames | 15–25% |
| Computational substrate | 8–15% |
| Ballast / bulk shielding | 2–5% |

**Weighted across Mercury throughput: ~22% net matrix consumption** (44% gross less 50% in-line recycling).

## Slime grade allocation to Mercury matrix

| Grade | Share of demand | Function |
|---|---|---|
| I | ~70% | Bulk structural feedstock |
| III | ~20% | Pour-and-sinter reactive infill |
| II + V + VI | ~10% | Interface, remediation, active |

Grade I dominance is why **bulk Venusian production is photosynthetic** (Grades I–II) at AutoSlime + conventional Schleimfarm scale. The industry's center of mass is commodity carbon, not specialty chemistry.

## Annual demand sizing

```
Mercury teardown            10¹⁵ kg/yr
× matrix fraction (0.22)
= matrix demand            2.2 × 10¹⁴ kg/yr ≈ 220 Gt/yr

+ matched demand from
  other inner-system
  construction (≈ same)    ~200–250 Gt/yr

Total polymer matrix       ~400–500 Gt/yr
Total Venusian output      ~600–800 Gt/yr (incl. specialty + edge)
```

## The bidding triangle

```
       SMA
       /  \
      /    \  grants beam to operators
     /      \  with forward contracts
    /        \
Mercury      Venusian
consortia ── operators
       contracts
```

Each leg needs the other two. **New entrants must assemble all three simultaneously** — concentrating the industry around long-standing relationships.

Conventional photosynthetic tier operates outside this — no beam, no forward contracts, spot prices.

## Post-Mercury transition (mid-3,500s CE)

When teardown winds down, matrix demand reconfigures. Three operator options:

1. **Pivot to terraforming carbon supply** — 10–30× scale-up, requires SMA endorsement
2. **Retrench to Grades IV–VI specialty** — industry shrinks to 10–20% of current scale
3. **Pivot to extrasolar export** — LMC/M82 construction absorbs Venusian output if shipping economics close

Current capital structures encode hedges across all three.

→ `mercury-extraction-pathway.md`, `pure-atp.md`, `venusian-cloudcraft-design.md`, `terraforming-debate.md`