Insulative · WS-INS-01 · v2.4.1
Insulative Panel – R-19 Core
Low-density cellulose / CNF blend with ATH flame retardant. Standard spec for INS-PNL-R19. Uses sodium alginate for foam structure and minimal binder loading to preserve R-value.
Approved
Forked from WS-INS-01 v2.3.0
Batch size
900 g
Nominal
Total mass
970.0 g
Incl. finishing
Parts
3
A · B · D
Ingredients
11
Across all parts
Cost / batch
$6.37
All parts
Cost / kg
$6.57
Finished material
Measured performance
Aggregated across attached testsCompression
14.2 MPa
Water absorption
3.8%
UV (0–10)
6.5/10
Density
140 kg/m³
Ingredients
Organized by mixing part · mass% = share of total recipeA
Part A · Aqueous pre-mix
9 ingredients · 960.0 g · $6.35
| Ingredient | Material | Amount | Mass % | Purpose | Cost |
|---|---|---|---|---|---|
Oak sawdust | Sawdust | 300 g | 30.9% | Structural filler — fine grain | $0.210 |
Distilled Water | — | 300 g | 30.9% | Hydration and flow medium | $0.075 |
Citrate Buffer pH 4.5 (0.05M) | Additive | 20 g | 2.1% | Maintains optimal pH | $0.100 |
CaCO₃ (Calcium Carbonate) | Additive | 60 g | 6.2% | Stiffener and filler | $0.018 |
Sodium Alginate | Additive | 50 g | 5.2% | Natural gel binder for adhesion | $0.900 |
Glycerin | Additive | 30 g | 3.1% | Co-plasticizer, flow modifier | $0.075 |
Borriesperse (Lignosulfonate) | Lignin | 40 g | 4.1% | Water-dispersible binder | $0.060 |
CNF (Cellulose Nanofibers) | NC | 100 g | 10.3% | Reinforcement and cohesion | $4.80 |
Aluminum trihydroxide (ATH) | Additive | 60 g | 6.2% | Flame retardant and smoke suppressant | $0.108 |
B
Part B · Foam developer
1 ingredient · 10.0 g · $0.025
| Ingredient | Material | Amount | Mass % | Purpose | Cost |
|---|---|---|---|---|---|
Hydrogen Peroxide (H₂O₂, 3%) | Additive | 10 g | 1.0% | Curing agent (via Fenton reaction) | $0.025 |
D
Part D · Post-cure treatment
1 ingredient · 0.0 g · $0.000
| Ingredient | Material | Amount | Mass % | Purpose | Cost |
|---|---|---|---|---|---|
Moss Spores Handle cold, inoculate after final cure | Additive | 0 g | 0.0% | Living growth material — surface colonization | $0.000 |
Mixing instructions
5 steps · total hands-on time 52 h 40 min- 1Aqueous pre-mix20 min35 °C
Combine distilled water, citrate buffer, and glycerin. Heat to 35°C. Dissolve sodium alginate slowly while stirring at 400 rpm.
- 2Slurry build-up15 min
Add borriesperse, then oak sawdust and CaCO₃. Mix 10 min. Disperse CNF last.
- 3Foam development5 min
Introduce H₂O₂ while whipping at 800 rpm. Volume should expand 2.2×. Lock shape within 5 min.
- 4Cast + ambient dry48 h
Cast into panel mold with breathable top. Cure 48h at ambient.
- 5Oven cure4 h70 °C
Ramp 3°C/min to 70°C and hold 4h. Lower temperature preserves cell structure.
Cost contribution by ingredient
Ranked high to low1.
CNF (Cellulose Nanofibers)
$4.80
75.3%
2.
Sodium Alginate
$0.900
14.1%
3.
Oak sawdust
$0.210
3.3%
4.
Aluminum trihydroxide (ATH)
$0.108
1.7%
5.
Citrate Buffer pH 4.5 (0.05M)
$0.100
1.6%
6.
Distilled Water
$0.075
1.2%
7.
Glycerin
$0.075
1.2%
8.
Borriesperse (Lignosulfonate)
$0.060
0.9%
9.
Hydrogen Peroxide (H₂O₂, 3%)
$0.025
0.4%
10.
CaCO₃ (Calcium Carbonate)
$0.018
0.3%
11.
Moss Spores
$0.000
0.0%
Batch economics
Total cost / batch$6.37
Finished mass970.0 g
Cost per kg$6.57
Priciest inputCNF (Cellulose Nanofibers)
Share of total from top 393%
Safety
- ATH is non-toxic but keep dust exposure <5 mg/m³.
- Alginate dissolution is slow — pre-hydrate overnight if mixing > 5 kg.
Batches mixed from this recipe
All batches →BAT-24-0419-012026-04-19 08:30 · 420 kg · M. Torresready
Attached tests
All tests →T-8815Thermal conductivity0.036 W/m·Kpass