Release Agent Recommendations (Please thoroughly understand the specific material of your mold before use):
**Dedicated Release Agents for ABS/PP Plastic Concrete Molds** (Key Rule: Strictly prohibit the use of pure machine oil, solvent oils, or strong solvent-based release agents, as these will cause swelling, discoloration, corrosion, and cracking of the plastic.)
1. **Modified Synthetic Ester Water-based Release Agent** (Optimal Choice; Universal for ABS & PP)
**Composition:** Plant-based synthetic esters + Emulsifiers + Water. Contains no aromatic solvents or heavy oils; does not corrode ABS or cause swelling in PP.
**Dilution:** Dilute the concentrated stock solution with water at a ratio of 1:3 to 1:6. Apply a thin, even coat using a brush or spray gun; pour the concrete once the surface is dry to the touch.
**Advantages:**
✅ Prevents discoloration, blistering, and swelling in both PP and ABS molds; ensures molds retain their shape even after repeated, long-term use.
✅ Minimizes oil stains on the concrete surface, allowing finished products to be painted or colored directly.
✅ A single application facilitates 3 to 6 consecutive mold releases, offering the highest cost-effectiveness for mass production.
2. **Weakly Modified Water-based Silicone Release Agent** (For High-Gloss, Premium Parts)
**Composition:** A water-based emulsion of polyether-modified organosilicone. Used after dilution with water; forms a very thin film and produces a mirror-like finish.
**Suitable for:** High-gloss ABS molds and white “fair-faced” (exposed) concrete parts. **Disadvantage:** Higher cost compared to other options. Additionally, silicone residue may interfere with adhesion; if your finished concrete parts require subsequent tiling or bonding, we recommend selecting the synthetic ester-based option mentioned above instead.
Recommended Release Agents for Pouring Concrete into FRP Fiberglass Molds (Ranked by Practical Priority)
1. **Water-based Polymer Concrete-Specific Release Agent** (First Choice; Universal for Precast Fair-faced Concrete)
**Composition:** Polymer emulsion, silicone emulsion, surfactants, water.
**Usage:** Dilute the concentrated solution with water at a ratio of 1:2 to 1:5; apply a thin, single coat using a brush or spray gun; allow to dry completely before pouring concrete.
**Advantages:**
* Does not corrode FRP; prevents oil seepage.
* Finished concrete products are free of oil stains, facilitating subsequent painting or tiling.
* Molds can be cleaned simply with water.
* Ideal for flower pots, cement ornaments, and fair-faced precast elements.
* The preferred choice for indoor mass production; eco-friendly and odorless.
**Disadvantages:** Dries slowly in low temperatures; use with caution in humid environments.
2. **Emulsified Machine Oil / Saponified Oil Release Agent** (For High-Turnover Mass Production and Complex/Irregular Molds)
**Composition:** Mineral oil + emulsifiers (forms a milky-white emulsion).
**Usage:** Apply the concentrated solution (or a slightly diluted version) via brushing to create an isolating oil film.
**Advantages:** Ensures smooth demolding; a single application allows for 3 to 8 consecutive demolding cycles.
* Prevents sticking in deep grooves and complex-shaped cement products.
**Disadvantages:** Leaves a slight oil film on the concrete surface; requires sanding to remove oil residue if subsequent plastering or painting is required.
**Simple, Low-Cost Emergency Solutions** (For Temporary/Emergency Use Only)
* **Waste Machine Oil + Dish Soap (Mixed with Water):** (Ratio: 10 parts oil/soap mixture to 1 part water; stir well). Inexpensive, but highly prone to oil seepage, which contaminates the cement surface; suitable only for non-aesthetic components.
* **Concentrated Soapy Water:** Short-acting; suitable only for simple, flat molds. Use with caution on FRP molds with high water absorption rates.
**Silicone Molds**
* Silicone naturally possesses inherent oily properties; therefore, no release agent is required—concrete can be poured directly into the mold.