West System® 105 Epoxy Resin vs. WEST SYSTEM 105-B Marine Grade Epoxy Resin
West System® 105 Epoxy Resin (Gougeon Brothers) and WEST SYSTEM 105-B Marine Grade Epoxy Resin (Gougeon Brothers (WEST SYSTEM)) achieve a 83% ASTM engineering compatibility score in Structural Infusion & Laminating Epoxy Systems. Tensile strength delta is -19.2 MPa (-26.3%) and thermal HDT delta is -14.7 °C, making them interchangeable with post-cure temperature and viscosity flow adjustments.
Side-by-Side ASTM Mechanical, Thermal, Rheological & Pricing Delta
| ASTM Parameter | A: West System® 105 Epoxy Resin (Gougeon Brothers) | B: WEST SYSTEM 105-B Marine Grade Epoxy Resin (Gougeon Brothers (WEST SYSTEM)) | Engineering Delta (A vs. B) |
|---|---|---|---|
| OEM Manufacturer & SKU | Gougeon Brothers • GOU-WS105-55G | Gougeon Brothers (WEST SYSTEM) • WST-105B-5GAL | Cross-Brand OEM Equivalent |
| ASTM D638 Tensile Strength (MPa / PSI) | 53.8 MPa (7,800 psi) | 73 MPa (10,588 psi) | -19.2 MPa (-26.3 %) |
| ASTM D648 Heat Deflection Temp (HDT °C / °F) | 53.3 °C (128 °F) | 68 °C (154 °F) | -14.7 °C (Verify Post-Cure) |
| ASTM D790 Flexural Strength (MPa) | 78 MPa | 117 MPa | -39 MPa (-33.3 %) |
| ASTM D2583 Barcol Hardness | 34 | 42 | -8 Barcol |
| ASTM D2196 Brookfield Viscosity @ 25°C | 975 cPs | 975 cPs | 0 cPs (0 %) |
| Gel Time @ 25°C (Minutes) | 35 min | 52 min | -17 min |
| ASTM D792 Specific Density (kg/m³) | 1120 kg/m³ | 1145 kg/m³ | -25 kg/m³ |
| US DOT 49 CFR & TDG Hazmat Class | Non-Regulated Ground / Class 8 Hardener (N/A) | Class 9 Environmentally Hazardous (UN3082) | N/A vs. UN3082 |
| Unit Price ($/kg USD) & Pack Price | $9.75/kg • $1,950 (55-Gal Drum) | $16.2/kg • $3,240 (200 kg Drum Kit) | -6.45 $/kg (-39.8 %) |
| US Stocking Warehouses | FL • ME • WA • MN • CA | Bay City, MI • Tampa, FL • Seattle, WA | 1–3 Days LTL Dispatch |
Both systems utilize stoichiometric Amine / Polyetheramine Hardeners. Verify exact mix ratio by weight (pbw) on the batch TDS before metering—never substitute hardeners across manufacturers without DSC glass-transition (Tg) qualification.
Post-Cure Schedule Adjustment Advised: ASTM D648 HDT differs by 14.7 °C (53.3 °C vs. 68 °C). For elevated-temperature tooling or dark-colored marine hulls, perform a 4–6 hour post-cure ramp at 60–80 °C (140–176 °F) to lock in full cross-link density.
Divergent Hazmat Profiles: West System® 105 Epoxy Resin is classified as Non-Regulated Ground / Class 8 Hardener (N/A), whereas WEST SYSTEM 105-B Marine Grade Epoxy Resin is classified as Class 9 Environmentally Hazardous (UN3082). Consolidate LTL freight accordingly.
Engineering FAQ: West System® 105 Epoxy Resin vs. WEST SYSTEM 105-B Marine Grade Epoxy Resin
1. Is West System® 105 Epoxy Resin a direct drop-in equivalent for WEST SYSTEM 105-B Marine Grade Epoxy Resin?▼
West System® 105 Epoxy Resin (Gougeon Brothers) and WEST SYSTEM 105-B Marine Grade Epoxy Resin (Gougeon Brothers (WEST SYSTEM)) achieve a 83% ASTM engineering compatibility score in Structural Infusion & Laminating Epoxy Systems. Tensile strength delta is -19.2 MPa (-26.3%) and thermal HDT delta is -14.7 °C, making them interchangeable with post-cure temperature and viscosity flow adjustments.
2. What is the ASTM D638 Tensile Strength and ASTM D648 HDT difference between West System® 105 Epoxy Resin and WEST SYSTEM 105-B Marine Grade Epoxy Resin?▼
West System® 105 Epoxy Resin (Gougeon Brothers) delivers ASTM D638 Tensile Strength of 53.8 MPa (7,800 psi) and ASTM D648 HDT of 53.3 °C, whereas WEST SYSTEM 105-B Marine Grade Epoxy Resin (Gougeon Brothers (WEST SYSTEM)) delivers 73 MPa (10,588 psi) and HDT of 68 °C. The net delta is -19.2 MPa (-26.3 %) tensile and -14.7 °C HDT.
3. Do West System® 105 Epoxy Resin and WEST SYSTEM 105-B Marine Grade Epoxy Resin use the same catalyst or hardener cure system?▼
Both systems utilize stoichiometric Amine / Polyetheramine Hardeners. Verify exact mix ratio by weight (pbw) on the batch TDS before metering—never substitute hardeners across manufacturers without DSC glass-transition (Tg) qualification. Post-Cure Schedule Adjustment Advised: ASTM D648 HDT differs by 14.7 °C (53.3 °C vs. 68 °C). For elevated-temperature tooling or dark-colored marine hulls, perform a 4–6 hour post-cure ramp at 60–80 °C (140–176 °F) to lock in full cross-link density.
4. How do US DOT 49 CFR Hazmat shipping rules and B2B drum/pack prices compare between West System® 105 Epoxy Resin and WEST SYSTEM 105-B Marine Grade Epoxy Resin?▼
Divergent Hazmat Profiles: West System® 105 Epoxy Resin is classified as Non-Regulated Ground / Class 8 Hardener (N/A), whereas WEST SYSTEM 105-B Marine Grade Epoxy Resin is classified as Class 9 Environmentally Hazardous (UN3082). Consolidate LTL freight accordingly. In US B2B distribution, West System® 105 Epoxy Resin is priced at $1,950 per 55-Gal Drum ($9.75/kg) vs. $3,240 per 200 kg Drum Kit ($16.2/kg) for WEST SYSTEM 105-B Marine Grade Epoxy Resin (delta: -6.45 USD/kg).
Related Drop-In Comparisons in Structural Infusion & Laminating Epoxy Systems
West System® 105 Epoxy Resin (Gougeon Brothers) and WEST SYSTEM 105-B Marine Grade Epoxy Resin (Gougeon Brothers (WEST SYSTEM)) 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).