DAP SDG-F
Reinforced grade · default condition
ASTM D5948 Type SDG
SDG-F = short glass-fiber filled DAP molding compound
Default general-purpose grade: short glass fiber gives 55 MPa tensile and 180 °C service for military and aerospace connectors and relay parts balancing strength, heat and insulation.
Values for the SDG-F condition
Other DAP grades and fills
DAP is listed in 6 conditions; see the grade overview at DAP.
Compare all 6 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Mineral (clay/silica) filled DAP | Choose the clay/silica mineral-filled compound for economical, dimensionally stable switches and terminal blocks with the best arc and tracking resistance; tensile strength drops to 40 MPa. | — | 40 | — | — |
Synthetic (acrylic/polyester) fiber filled DAP | Pick acrylic or polyester fiber filling for the lowest density (1.4 g/cm³) plus best toughness and arc resistance in weight-critical aerospace connectors and thin-wall radomes; 150 °C limit. | — | 45 | — | — |
Flame-retardant / UL 94 V-0 listed DAP | Specify when a UL Yellow Card V-0 listing with guaranteed CTI and glow-wire ratings is required for electrical parts; tensile strength settles near 50 MPa in exchange for the flame-retardant package. | — | 50 | 0.5 | 112 HRM |
SDG-FDefaultThis page Short glass-fiber filled DAP molding compound | Default general-purpose grade: short glass fiber gives 55 MPa tensile and 180 °C service for military and aerospace connectors and relay parts balancing strength, heat and insulation. | — | 55 | — | — |
Glass-filled diallyl isophthalate | Choose the isophthalate-based glass-filled compound for continuous service above 200 °C in high-temperature connectors and motor insulation, where the standard orthophthalate types fall short. | — | 60 | — | — |
Long glass-fiber (high-impact) DAP | Use long glass fiber for load-bearing or impact-loaded thick-wall insulators needing 70 MPa and 185 °C service, accepting poor flow that limits it to compression or transfer molding. | — | 70 | 0.9 | 108 HRM |
What is DAP SDG-F?
DAP SDG-F is DAP in the SDG-F grade — default general-purpose grade: short glass fiber gives 55 MPa tensile and 180 °C service for military and aerospace connectors and relay parts balancing strength, heat and insulation. DAP SDG-F has a tensile strength of 55 MPa (7.98 ksi), stronger than 61% of polymer grades. Elongation at break is 0.6% and the elastic modulus is 10.5 GPa (1.52 Msi). DAP SDG-F has a density of 1.8 g/cm³ (0.065 lb/in³), heavier than 95% of polymer grades. Its glass-transition temperature is 160°C (320 °F).
Advantages
- Conducts heat well — 0.5 W/m·K (0.289 BTU/hr·ft·°F), better than 98% of polymer grades
- Stiff — 10.5 GPa (1.52 Msi), better than 95% of polymer grades
- High service temperature — 180°C (356 °F), better than 85% of polymer grades
- Low, predictable mold shrinkage — 0.4%, better than 82% of polymer grades
- Good UV / weathering resistance — 55/100, better than 77% of polymer grades
Limitations
- Limited formability — 0/100, worse than 100% of polymer grades
- Limited ductility — 0.6%, worse than 99% of polymer grades
- Difficult to weld — 0/100, worse than 98% of polymer grades
- Heavy — 1.8 g/cm³ (0.065 lb/in³), worse than 95% of polymer grades
- Difficult to machine — 40/100, worse than 82% of polymer grades
DAP SDG-F properties
Typical room-temperature values for DAP SDG-F; 11 are specific to this condition. Other listed values are DAP reference data and may not represent this condition. Bars are the position among polymer grades.
Physical4
DAP SDG-F has a density of 1.8 g/cm³ (0.065 lb/in³), heavier than 95% of polymer grades. Its glass-transition temperature is 160°C (320 °F).
Mechanical9
DAP SDG-F has a tensile strength of 55 MPa (7.98 ksi), stronger than 61% of polymer grades. Elongation at break is 0.6% and the elastic modulus is 10.5 GPa (1.52 Msi).
Thermal10
DAP SDG-F is rated for continuous service to 180°C (356 °F). It conducts heat at 0.5 W/m·K (0.289 BTU/hr·ft·°F), better than 98% of polymer grades. Thermal expansion is 25 µm/m·K (13.9 µin/in·°F).
Electrical7
DAP SDG-F is an electrical insulator with a dielectric strength of 16 kV/mm (406.4 V/mil) and a resistivity of 1×10¹³ Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (80/100), worse than 52% of polymer grades. UV resistance is good.
Sustainability3
Producing a kilogram of DAP SDG-F takes about 105 MJ of energy and emits 5.5 kg of CO₂ — more than 54% of polymer grades. Typical recycled content is 0%.
Manufacturability6
DAP SDG-F's machinability is fair (40/100, worse than 82% of polymer grades); weldability not recommended (0/100); formability not recommended (0/100).
Common Calculations4
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with DAP SDG-F
Is DAP easy to machine?
Turning, milling, drilling and tapping are all possible, but glass and mineral fillers are highly abrasive — use carbide or PCD tooling with low feed and dust extraction. The material is brittle, so back up drill exits to prevent breakout.
Can DAP be welded?
Cross-linked thermoset; it cannot be melt-welded. Join with epoxy or cyanoacrylate adhesive or mechanical fasteners — moulded-in metal inserts are the most common method.
Can DAP be formed, bent or molded?
Processed by compression, transfer or thermoset screw injection moulding: preheat the compound to 90–105 °C, run mould temperature 145–180 °C and cure about 30–60 s/mm. There is no post-shrinkage, so dimensions stay stable; pay attention to venting and flash control.
What surface finishes work on DAP?
Parts leave the tool with a matte or gloss surface and usually need no secondary work; deflash, bead blast, laser mark or print as required. Surface energy is low, so plasma treatment or a primer is needed before painting or plating.
DAP chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| diallyl phthalate prepolymer + monomer (diallyl phthalate prepolymer and monomer matrix | 25 – 45 | 35 |
| glass fiberchopped glass fiber (SDG-F) | 15 – 40 | 25 |
| mineral filler (clay / silica / CaCO3)primary filler in MDG grades | 20 – 45 | 35 |
| organic peroxide initiator (e.g. dicumyl | 0.5 – 2 | 1 |
| mold release / lubricant (metallic stear | 0.3 – 1.5 | 0.8 |
| pigment / stabilizer | 0.2 – 2 | 0.7 |
DAP SDG-F — frequently asked
What is DAP SDG-F used for?
DAP SDG-F is typically used for electrical connectors, terminal blocks, aerospace connector housings and precision insulators. In short: dimensionally stable thermoset; low moisture pickup; connector-grade insulation.
What is the tensile strength of DAP SDG-F?
DAP SDG-F has a typical tensile strength of 55 MPa (7.98 ksi) — stronger than 61% of polymer grades. Strength varies by condition: see the 6 listed tempers.
Is DAP SDG-F easy to machine?
Not especially — machinability is rated fair (40/100, worse than 82% of polymer grades). Turning, milling, drilling and tapping are all possible, but glass and mineral fillers are highly abrasive — use carbide or PCD tooling with low feed and dust extraction. The material is brittle, so back up drill exits to prevent breakout.
Can DAP SDG-F be welded?
Not readily — weldability is rated not recommended (0/100). Cross-linked thermoset; it cannot be melt-welded. Join with epoxy or cyanoacrylate adhesive or mechanical fasteners — moulded-in metal inserts are the most common method.
What surface finishes work on DAP SDG-F?
Parts leave the tool with a matte or gloss surface and usually need no secondary work; deflash, bead blast, laser mark or print as required. Surface energy is low, so plasma treatment or a primer is needed before painting or plating.
Can DAP SDG-F be formed, bent or molded?
Processed by compression, transfer or thermoset screw injection moulding: preheat the compound to 90–105 °C, run mould temperature 145–180 °C and cure about 30–60 s/mm. There is no post-shrinkage, so dimensions stay stable; pay attention to venting and flash control.
What is the maximum service temperature of DAP SDG-F?
DAP SDG-F is rated for continuous use to about 180°C (356 °F), and briefly to 230°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- ASTM D5948 Standard Specification for Molding Compounds, Thermosetting — ASTM International (2019)
- MIL-M-14H Molding Plastics and Molded Plastic Parts, Thermosetting — US DoD (1989)
- Engineered Materials Handbook Vol.2: Engineering Plastics — ASM International (1988)
- DAP/DAIP molding compound datasheets (allyl compounders) — Cosmic Plastics / Daiso / Polymics (2023)
- UL Yellow Card / IEC 60112, 60695 electrical ratings for allyl compounds — UL Solutions (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.