Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester vs. Polynt Stypol 040-8086 Low-Profile DCPD Marine Polyester
Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester (Interplastic Corp) and Polynt Stypol 040-8086 Low-Profile DCPD Marine Polyester (Polynt Composites USA) achieve a 96.4% ASTM engineering compatibility score in Isophthalic & DCPD Marine Polyester Resins. Tensile strength delta is +2 MPa (+3.1%) and thermal HDT delta is -3 °C, making them qualified for direct drop-in substitution under standard cure schedules.
Side-by-Side ASTM Mechanical, Thermal, Rheological & Pricing Delta
| ASTM Parameter | A: Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester (Interplastic Corp) | B: Polynt Stypol 040-8086 Low-Profile DCPD Marine Polyester (Polynt Composites USA) | Engineering Delta (A vs. B) |
|---|---|---|---|
| OEM Manufacturer & SKU | Interplastic Corp • IPC-SIL95BA | Polynt Composites USA • POL-STY8086-DR | Cross-Brand OEM Equivalent |
| ASTM D638 Tensile Strength (MPa / PSI) | 66 MPa (9,573 psi) | 64 MPa (9,282 psi) | +2 MPa (+3.1 %) |
| ASTM D648 Heat Deflection Temp (HDT °C / °F) | 75 °C (167 °F) | 78 °C (172 °F) | -3 °C (Direct Thermal Match) |
| ASTM D790 Flexural Strength (MPa) | 114 MPa | 112 MPa | +2 MPa (+1.8 %) |
| ASTM D2583 Barcol Hardness | 40 | 40 | 0 Barcol |
| ASTM D2196 Brookfield Viscosity @ 25°C | 460 cPs | 440 cPs | +20 cPs (+4.5 %) |
| Gel Time @ 25°C (Minutes) | 24 min | 24 min | 0 min |
| ASTM D792 Specific Density (kg/m³) | 1115 kg/m³ | 1115 kg/m³ | 0 kg/m³ |
| US DOT 49 CFR & TDG Hazmat Class | Class 3 Flammable Liquid (UN1866) | Class 3 Flammable Liquid (UN1866) | Identical (UN1866) |
| Unit Price ($/kg USD) & Pack Price | $7.8/kg • $1,755 (225 kg Steel Drum) | $6.4/kg • $1,440 (225 kg Steel Drum) | +1.4 $/kg (+21.9 %) |
| US Stocking Warehouses | Lakeland, FL • Houston, TX • Minneapolis, MN | Lakeland, FL • Houston, TX • Minneapolis, MN | 1–3 Days LTL Dispatch |
Both matrices cross-link via free-radical polymerization using 1.25%–2.0% MEKP (Methyl Ethyl Ketone Peroxide, UN3105) or Cumene Hydroperoxide (CHP) with Cobalt Octoate promoter. Low-hydrogen-peroxide MEKP (e.g., Norox MEKP-925H) is recommended to eliminate micro-foaming.
Direct Drop-In Qualified: Thermal deflection (ASTM D648 HDT) differs by only 3 °C (75 °C vs. 78 °C). Existing mold cure and demold cycles can be maintained without thermal schedule modification.
Identical Hazmat Logistics Profile: Both SKUs ship under US DOT 49 CFR & Transport Canada TDG as Class 3 Flammable Liquid (UN Number: UN1866). Note 49 CFR § 177.848 segregation if ordering with Class 5.2 Organic Peroxides (UN3105).
Engineering FAQ: Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester vs. Polynt Stypol 040-8086 Low-Profile DCPD Marine Polyester
1. Is Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester a direct drop-in equivalent for Polynt Stypol 040-8086 Low-Profile DCPD Marine Polyester?▼
Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester (Interplastic Corp) and Polynt Stypol 040-8086 Low-Profile DCPD Marine Polyester (Polynt Composites USA) achieve a 96.4% ASTM engineering compatibility score in Isophthalic & DCPD Marine Polyester Resins. Tensile strength delta is +2 MPa (+3.1%) and thermal HDT delta is -3 °C, making them qualified for direct drop-in substitution under standard cure schedules.
2. What is the ASTM D638 Tensile Strength and ASTM D648 HDT difference between Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester and Polynt Stypol 040-8086 Low-Profile DCPD Marine Polyester?▼
Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester (Interplastic Corp) delivers ASTM D638 Tensile Strength of 66 MPa (9,573 psi) and ASTM D648 HDT of 75 °C, whereas Polynt Stypol 040-8086 Low-Profile DCPD Marine Polyester (Polynt Composites USA) delivers 64 MPa (9,282 psi) and HDT of 78 °C. The net delta is +2 MPa (+3.1 %) tensile and -3 °C HDT.
3. Do Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester and Polynt Stypol 040-8086 Low-Profile DCPD Marine Polyester use the same catalyst or hardener cure system?▼
Both matrices cross-link via free-radical polymerization using 1.25%–2.0% MEKP (Methyl Ethyl Ketone Peroxide, UN3105) or Cumene Hydroperoxide (CHP) with Cobalt Octoate promoter. Low-hydrogen-peroxide MEKP (e.g., Norox MEKP-925H) is recommended to eliminate micro-foaming. Direct Drop-In Qualified: Thermal deflection (ASTM D648 HDT) differs by only 3 °C (75 °C vs. 78 °C). Existing mold cure and demold cycles can be maintained without thermal schedule modification.
4. How do US DOT 49 CFR Hazmat shipping rules and B2B drum/pack prices compare between Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester and Polynt Stypol 040-8086 Low-Profile DCPD Marine Polyester?▼
Identical Hazmat Logistics Profile: Both SKUs ship under US DOT 49 CFR & Transport Canada TDG as Class 3 Flammable Liquid (UN Number: UN1866). Note 49 CFR § 177.848 segregation if ordering with Class 5.2 Organic Peroxides (UN3105). In US B2B distribution, Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester is priced at $1,755 per 225 kg Steel Drum ($7.8/kg) vs. $1,440 per 225 kg Steel Drum ($6.4/kg) for Polynt Stypol 040-8086 Low-Profile DCPD Marine Polyester (delta: +1.4 USD/kg).
Related Drop-In Comparisons in Isophthalic & DCPD Marine Polyester Resins
Interplastic Silmar SIL95BA-41 Crystal Clear Surfboard Polyester (Interplastic Corp) and Polynt Stypol 040-8086 Low-Profile DCPD Marine Polyester (Polynt Composites USA) are trademarks of their respective owners. CompositeMatrix Technologies Inc. is an independent North American B2B composite material intelligence registry; comparative ASTM D638, D648, D790, D2583, and D2196 figures are presented under the US legal doctrine of Nominative Fair Use (Lanham Act, 15 U.S.C. § 1125) and Feist Publications, Inc. v. Rural Telephone Service Co. (499 U.S. 340) for scientific and industrial cross-reference. Cure schedules, exotherm behavior, and laminate qualification must be verified by a licensed Naval Architect or Professional Engineer (PE) against current manufacturer batch Technical Data Sheets (TDS) and Safety Data Sheets (SDS).