CureLab 1.0 / LEARNING LAB

Explore the curve. Understand the model.

Theme
Educational model | Illustrative parameters | Not experimental data or an industrial curing recommendation.

A SMALL MODEL. A CLEARER PICTURE.

Discover what shapes
a curing curve.

Explore how temperature and an induction delay shape an idealised rubber rheometer response. Change a condition, follow the curve and connect the result to the mathematics.

Enter the virtual lab
Initialising embedded illustrative parameters…

01 / EXPLORE

Virtual rheometer

Hypothetical reference preset

Experiment conditions

120 °C180 °C
10 min60 min

Playback is accelerated; it does not represent physical laboratory time.

Ready · full curve shown

Advanced / illustrative

Fictional parameter overrides for sensitivity lessons. The reference preset is preserved.

Model-generated torque response

Induction → rise → plateau

α is a normalised model progress index, not directly measured crosslink density. MH is an asymptote.

Milestones use the full analytical model. “Beyond duration” means the event falls outside this plot. CRI uses full-model milestones, including those beyond the window.

02 / COMPARE

One formulation, three temperatures

The same illustrative parameters at 140, 150 and 160 °C. Higher temperature shortens induction and increases the post-induction rate for this model.

Full-model comparison · exact milestones may lie beyond the plot
Temperature tᵢ (min) ts2 (min) tc90 (min)

03 / PUT IT INTO PRACTICE

Four guided experiments

Answers describe this hypothetical model. Lesson completion is saved only on this device, where local storage is available.

04 / RECORD & REFLECT

Your experiment summary

CSV contains the complete selected plotting window at 0.1 min intervals, including its endpoint, regardless of the animated reveal.

Illustrative model parameters
Parameter Value
Analytical model outputs
Output Value

Assumptions: constant temperature; fixed ML and MH across temperature; an illustrative initial torque dip, followed by a smooth squared-exponential rise. No reversion or chemical crosslink inference.

Reflect on your result

  1. How does tᵢ differ from ts2?
  2. Which milestones fall outside your plotting window?
  3. Why does reaching the tc90 criterion not imply 90% chemical crosslinking?

Educational model | Illustrative parameters | Not experimental data or an industrial curing recommendation.

05 / KNOW THE LIMITS

A teaching model, with clear boundaries.

Definitions & equations

tᵢ · induction time
A mathematical delay before the model rises.
ts2 · torque-rise milestone
Time to ML + 2 dN·m; undefined if MH − ML ≤ 2 dN·m. This app convention may differ from instrument methods.
tc90 · torque-rise criterion
Time to ML + 0.9 × (MH − ML). It does not measure chemical crosslinking.
CRI · cure rate index
100 / (tc90 − ts2), in min⁻¹. The factor 100 is a scale convention. Undefined if milestones are invalid.

Model temperature T is in kelvin: T (K) = temperature (°C) + 273.15. The equations below use reference temperature Tref, also in kelvin.

tᵢ = ti,ref exp[(Eᵢ/R)(1/T − 1/Tref)]
k = kref exp[−(Eₐ/R)(1/T − 1/Tref)]
α = 0 for t ≤ tᵢ; otherwise α = 1 − exp[−(k(t − tᵢ))²]
For 0 ≤ t < tᵢ: M = ML + D(1 − t/tᵢ)²
For t ≥ tᵢ: M = ML + (MH − ML)α
D = 0.04(MH − ML)

The initial dip is illustrative. During the dip, α remains zero. If tᵢ is zero, the model skips the initial dip.

Provenance & privacy

All constants are hypothetical and uncalibrated, embedded in this standalone file. The equations above and the illustrative parameter table in the report describe the active model. The conceptual natural-rubber label does not identify a measured formulation. No expert endorsement is implied.

The model cannot determine actual material properties, tensile strength, durability, crosslink density, industrial curing conditions or scorch safety. It cannot represent non-isothermal curing, reversion or real CV/EV/Semi-EV behaviour.

CureLab does not require an account, include analytics scripts, or upload experiment inputs. Calculations run on your device. Your language and theme preferences, and optional quiz progress, are stored in this browser using local storage. You can remove them by clearing this site's browser data.

When you access the hosted app, the hosting provider may process technical information such as your IP address and server logs. When the link is shared, a messaging service may request the preview image from its host. These services have their own privacy practices.

This standalone file contains all styles, scripts, lessons and reference parameters. Open it directly in a browser to use the lab offline.