EcoPoxy
FlowCast SPR
- Type
- Casting
- Data sheet revision
- NA_EN_FlowCastSPR_TDS_092223_v2.3
- Sources checked
- 2026-09-30
- Page status
- Published October 3, 2026
The faster companion to FlowCast, for smaller castings and thinner pieces. EcoPoxy's data sheet limits it to 25 mm (1 in) per pour, with 4 to 5 hours of working time for a 25 mm casting; its data sheet and application guide give different times before the next pour.
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 (A:B) by volumeTDS |
|---|---|
| Mix ratio by weight (A:B) | 2.5:1 (A:B) by massTDS |
| Maximum pour depth per layer | 25mm (1")TDSper layer; recommended casting thickness 6-25mm (0.25-1") for pours up to 3 L; deeper than 25 mm and/or over 3 L: pour in multiple layers |
|---|---|
| Minimum pour depth | 6mm (0.25")TDSlower end of recommended casting thickness; FlowCast SPR cures more slowly at lower thicknesses and volumes |
| Maximum mass or volume per pour | 3LTDSmaximum recommended volume per pour (TDS); the Application Guide says up to 2 L per layer |
| Recommended temperature | 20-25°C (68-77°F)TDSrecommended working temperature for resin, workpiece and workspace; ideal 22°C (72°F) |
| Pot life | not published |
|---|---|
| Working time | 4-5 hours (25mm casting); 6-7 hours (13mm casting)TDSworking time limit in mold for a 152 x 432 mm (6 x 17 in) casting 25 mm (1 in) deep at 22°C (72°F), ~50% RH; 6-7 h for the same casting 13 mm (1/2 in) deep |
| Time between pours | at set to touch: 24 hours (25mm casting); 32 hours (13mm casting); then abradeTDSEcoPoxy recommends pouring the next layer once the previous one reaches set to touch and scuffing it with 220 grit; TDS set-to-touch times: 24 h for a 25 mm casting, 32 h for a 13 mm casting at 22°C (72°F). The Application Guide says this is typically 18 hours |
| Recoat window | 20-32 hours (tacky to touch period, 13mm casting); not applicable for 25mm castingsTDSwindow for an additional pour without abrading, 13 mm (1/2 in) casting at 22°C (72°F); for 25 mm castings the TDS says not applicable (wait for set to touch and abrade) |
| Tack-free | 24 hours (set to touch, 25mm casting); 32 hours (13mm casting)TDSset to touch = surface tack-free; 25 mm casting at 22°C (72°F); 32 h for a 13 mm casting |
| Demold | 24 hours (25mm casting); 40-48 hours (13mm casting)TDS25 mm casting at 22°C (72°F); 40-48 h for a 13 mm casting; support the casting until fully cured |
| Full cure | 3 days (25mm casting); 7 days (13mm casting)TDS25 mm casting at 22°C (72°F); 7 days for a 13 mm casting |
| Mixed viscosity | 410 cP at 22°C (72°F)TDSinitial mixed viscosity at 22°C (72°F), ASTM D2196 |
|---|---|
| Specific gravity or density, Part A | 1.182TDS |
| Specific gravity or density, Part B | 0.966TDS |
| Specific gravity, mixed | not published |
| Density, mixed | not published |
| Hardness | Shore D 80TDS |
What the numbers mean for a pour
Pours needed with a limit of 0.98 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 calculated (see below) | – |
| 3 in (76 mm) | 3 | not calculated (see below) | – |
| 4 in (102 mm) | 4 | not calculated (see below) | – |
The data sheet gives different waits for different layer thicknesses (0.51 in, 0.98 in). No schedule is calculated; read the published wording for your 1 in layers.
What the manufacturer says
Paraphrased from the manufacturer’s documents.
Intended use
- FlowCast SPR is the faster-reacting companion to FlowCast, meant for smaller castings and thinner live-edge pieces such as serving trays and coasters.Page
Heat
- Because it reacts faster and runs hotter than FlowCast for the same casting size, it is not suitable for larger pours.Page
- Peak exotherm is 125°C (257°F) for a 1 kg casting; reactivity is rated low-moderate.TDS
- Cured glass transition temperature by DSC is 52°C (126°F) for the 25 mm casting and 39°C (101°F) for the 13 mm casting.TDS
Layering
- Pours deeper than 25 mm and/or larger than 3 L may need several thinner layers to avoid overheating; wait until the first layer is fully set to touch, sand with 220 grit and wipe down before the next.Page
- For 25 mm castings EcoPoxy advises against pouring a second layer while the casting is still hot, and recommends waiting for set to touch and abrading first.TDS
Other notes
- The SDSs give calculated densities of 1.18 g/mL for Part A and 0.97 g/mL for Part B, consistent with the TDS specific gravities.SDS A
- Part B density is listed as 0.97 g/mL in its SDS.SDS B
- The TDS lists a theoretical cured density of 1.11 g/cm3 (0.040 lbs/in3), not a mixed-liquid density.TDS
- Liquid Color Pigments should not exceed 3% of total volume (about 4% by weight).Instr.
- Shelf life is two years unopened and three months once opened; store at 15-25°C (59-77°F).Page
Surface preparation
- Surfaces that will be submerged should be seal-coated (UVPoxy preferred) to stop air and moisture escaping and forming bubbles.Page
UV and color
- UV stabilisers eventually lose effectiveness, so finished projects should not be kept outdoors; pigments help resist yellowing.Page
Safety data sheet summary
Signal word: DangerSDS B
Part A hazard statements
- H315 Causes skin irritation
- H319 Causes serious eye irritation
- H317 May cause an allergic skin reaction
Part B hazard statements
- H314 Causes severe skin burns and eye damage
- H318 Causes serious eye damage
Protective equipment
- Wear chemical-resistant, impervious gloves and inspect them before use.
- Wear safety glasses or goggles for Part A.
- For Part B, use safety glasses with side shields or goggles, consider a face shield against splashes, and wear full body protection.
- Wear an approved respirator if engineering controls do not keep airborne concentrations below exposure limits.
Ventilation
- Provide enough ventilation to keep vapor, mist and dust levels below workplace exposure limits, with eyewash stations and safety showers nearby.
- The Part B SDS gives the same ventilation requirement.
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
- Maximum mass or volume per pour: 3L (TDS and product page) vs. up to 2L per layer (Application Guide v2.1) (TDS, Instr.). The table shows the value from the TDS.
- Time between pours: set to touch at 24 hours (25mm) / 32 hours (13mm) (TDS) vs. set to touch, typically 18 hours after the previous pour (Application Guide) (TDS, Instr.). The table shows the value from the TDS.
Not published
The documents listed below give no value for: Pot life; Specific gravity, mixed; Density, mixed. We leave these blank rather than estimate them.
Use this product in a calculator
Sources
- EcoPoxy. FlowCast SPR Technical Data Sheet (EN) (TDS). Document revision: NA_EN_FlowCastSPR_TDS_092223_v2.3. Accessed September 30, 2026.
- EcoPoxy. FlowCast SPR Application Guide — Serving Trays (Instr.). Document revision: NA_EN_FlowCastSPR_AG_120122-v2.1. Accessed September 30, 2026.
- EcoPoxy. Safety Data Sheet - FlowCast SPR Part A (US English) (SDS A). Document revision: Revision date: 10.24.2022. Accessed September 30, 2026.
- EcoPoxy. Safety Data Sheet - FlowCast SPR Part B (US English) (SDS B). Document revision: Initial Preparation Date: 10.24.2022. Accessed September 30, 2026.
- EcoPoxy. FlowCast® SPR (Page). Accessed September 30, 2026.