Entropy Resins
CCR Clear Casting Epoxy Resin with CCS Clear Casting Slow Hardener
- Type
- Casting
- Data sheet revision
- TDS revised May 2020
- Sources checked
- 2026-09-30
- Page status
- Published October 3, 2026
A 2:1 clear casting epoxy used with Entropy's slow hardener, poured up to 1 in deep. Entropy gives a 360 minute pot life at 77 °F and says to pour the next layer when the previous one feels tacky, without stating hours.
Published values
Copied as printed, with test conditions where the manufacturer gives them. Tags link to the source document.
| Mix ratio by volume (A:B) | 2:1 by volumeTDS |
|---|---|
| Mix ratio by weight (A:B) | 100:42 by weight (CCS Slow)TDS |
| Maximum pour depth per layer | up to 1" deep per pour (CCS Slow)PageCCS Slow hardener gives a clear, colorless cure at pours up to 1 in; deeper castings are built in multiple layers |
|---|---|
| Minimum pour depth | not published |
| Maximum mass or volume per pour | not published |
| Recommended temperature | not published |
| Pot life | 360 min (@ 77ºF/25ºC)TDSTDS: @ 77ºF/25ºC (the product page says pot life and tack-free tests were conducted at 95ºF/35ºC); varies with volume and room temperature |
|---|---|
| Working time | not published |
| Time between pours | when the previous 1" pour becomes tacky (feels like the backside of masking tape)Pageno time in hours is published; the next layer can be poured once the previous 1 in pour is tacky like the back of masking tape |
| Recoat window | not published |
| Tack-free | 72 hrs (@ 95ºF/35ºC)TDS@ 95ºF/35ºC |
| Demold | not published |
| Full cure | 7 days @ 77ºF/25ºC, post cure recommendedTDS@ 77ºF/25ºC; post cure recommended |
| Mixed viscosity | 270 (mixed, @ 77ºF/25ºC; unit not printed)TDS@ 77ºF/25ºC; published as A/B/Mixed 2160/15/270 for CCS Slow without a unit |
|---|---|
| Specific gravity or density, Part A | 1.13 (resin, specific density @ 77ºF/25ºC)TDS |
| Specific gravity or density, Part B | 0.95 (CCS Slow hardener, specific density @ 77ºF/25ºC)TDS |
| Specific gravity, mixed | 1.07 (mixed, specific density @ 77ºF/25ºC)TDS |
| Density, mixed | not published |
| Hardness | Shore D 70-80TDS |
What the numbers mean for a pour
Pours needed with a limit of 1 in per pour. Worked out with the layer planner.
| Total thickness | Pours | Earliest start of last pour | Notes |
|---|---|---|---|
| 1 in (25 mm) | 1 | no wait (one pour) | – |
| 2 in (51 mm) | 2 | not published | – |
| 3 in (76 mm) | 3 | not published | – |
| 4 in (102 mm) | 4 | not published | – |
The data sheet describes the wait in words only (“when the previous 1" pour becomes tacky (feels like the backside of masking tape)”), so no time is calculated.
What the manufacturer says
Paraphrased from the manufacturer’s documents.
Intended use
- The slow CCS hardener is meant for high-build casting, while the fast CCF hardener is for quick, small projects such as jewelry.TDS
Layering
- Castings deeper than 1 in are built up in multiple layers.Page
Temperature
- Small castings benefit from a 24-hour post-cure at 100°F (38°C) to ensure full cure.Page
- Work in a controlled environment and avoid high humidity and cold temperatures.Page
Heat
- At higher working temperatures, pour smaller amounts to avoid excessive exotherm.Page
- Ultimate Tg (DSC midpoint) for the slow system is 127ºF/52ºC per the TDS.TDS
Other notes
- For best results, weigh the two components to within 5% of the recommended mix ratio and mix at least two minutes while scraping the container.Page
- The CCS Slow Hardener SDS gives a relative density of 0.95 at 20°C and a bulk density of 7.95 lbs/gal (0.95 kg/L), matching the TDS hardener value.SDS B
- The resin SDS does not publish a relative density.SDS A
Surface preparation
- Amine blush can form in cool, moist conditions; it is water-soluble and removed with clean water and an abrasive pad before further bonding.Page
Coverage
- Kit yields are given by volume, e.g. a 1.5 gal kit covers 346 cu in and a 3 gal kit 691 cu in; coverage drops up to 50% over porous substrates or fiber.Page
Safety data sheet summary
Signal word: DangerSDS A
Part A hazard statements
- H315 Causes skin irritation
- H317 May cause an allergic skin reaction
- H319 Causes serious eye irritation
- H360F May damage fertility
- H411 Toxic to aquatic life with long lasting effects
Part B hazard statements
- H314 Causes severe skin burns and eye damage
- H402 Harmful to aquatic life
Protective equipment
- For the resin, wear PVC or rubber gloves to minimise skin contact and use protective safety glasses.
- Workers exposed above the exposure limit must wear appropriate certified respirators (resin SDS).
- For the hardener, chemical-impervious gloves are required, along with safety glasses with side shields.
- The hardener SDS calls for chemical-resistant clothing such as coveralls or an apron and boots.
- Use a NIOSH/MSHA-approved respirator when concentrations exceed permissible exposure limits (hardener SDS).
Ventilation
- Provide adequate ventilation, preferably local exhaust plus good general extraction; if that cannot keep vapour below exposure limits, wear respiratory protection.
- The hardener SDS gives the same ventilation guidance.
A summary, not the full SDS. Read the SDS for both parts before use and follow its first-aid section in case of exposure. This is not medical advice.
Where the manufacturer’s documents disagree
- Pot life: 360 min @ 77ºF/25ºC (TDS) vs. 360 min pot life, tests conducted at 95ºF/35ºC (product page) (TDS, Page). The table shows the value from the TDS.
Not published
The documents listed below give no value for: Minimum pour depth; Maximum mass or volume per pour; Recommended temperature; Working time; Recoat window; Demold; Density, mixed. We leave these blank rather than estimate them.
Use this product in a calculator
Sources
- Entropy Resins. Clear Casting System — TDS Technical Data Sheet (CCR - Technical Data Sheet) (TDS). Document revision: TDS revised May 2020. Accessed September 30, 2026.
- Entropy Resins. Clear Casting Epoxy Resin - Entropy Resins (Page). Accessed September 30, 2026.
- Entropy Resins. Safety Data Sheet — ENTROPY RESINS® CLEAR CASTING EPOXY RESIN (CCR SDS) (SDS A). Document revision: Revision Date: 15 December, 2025. Accessed September 30, 2026.
- Entropy Resins. Safety Data Sheet — ENTROPY RESINS® CLEAR CASTING SLOW HARDENER (CCS SDS) (SDS B). Document revision: Revision Date: 9 October, 2025. Accessed September 30, 2026.