Sample data from Engineering Database — 375 reference tables, deterministic calculators, and Engineering AI. Sign up free
Insulation R Values: nbs gum rubber
1160 to 1648
Insulation R-values and thermal conductivity data from NIST SRD 81 — covers fiberglass, foam, cellulose, mineral wool, and other building insulation materials
| material id | record id | date | delta t (F) | delta x (in) | density (lb/ft3) | description | form | k w mk (W/mK) | manufacturer | material | mean temp (F) | r value per inch (ft2hF/BTU/in) | rsi per inch (m2K/W/in) | standard | test method |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| nbs gum rubber | 1160 | 8/11/1959 | 7.98 | 0.3225 | 59.49 | Natural rubber, ASTM P15-58T: Natural Rubber (100.0), Zinc Oxide (6.0), Sulphur (3.5), Stearic Acid (0.5), Mercaptobenzo-thiozole (0.5). | Slab | 0.998 | NBS, Leather Section | NBS Gum Rubber | 115.65 | 0.144517 | 0.025451 | NIST SRD 81 API | ASTM C 177 |
| nbs gum rubber | 1528 | 6/5/1964 | 11.13 | 0.4866 | 60.84 | Natural rubber, ASTM-2A recipe, cure 140 °C, 0.5 h: R(100g); ZnO(5g); S(2.5g); Stearic acid(2.0g); Altex(1.0g); phenyl beta naphthylamine (antioxidant) (1.0g); Samples 8x8x½ in., No.1,6 | Slab | 1.0331 | NBS, Rubber Section | NBS Gum Rubber | 129.76 | 0.139607 | 0.024586 | NIST SRD 81 API | ASTM C 177 |
| nbs gum rubber | 1529 | 6/8/1964 | 10.83 | 0.478 | 61.93 | Natural rubber, ASTM-2A recipe, cure 140 °C, 0.5 h: R(100g); ZnO(5g); S(2.5g); Stearic acid(2.0g); Altex(1.0g); phenyl beta naphthylamine (antioxidant) (1.0g); Samples 8x8x½ in., No.1,6 | Slab | 1.0393 | NBS, Rubber Section | NBS Gum Rubber | 69.67 | 0.138774 | 0.02444 | NIST SRD 81 API | ASTM C 177 |
| nbs gum rubber | 1530 | 6/9/1964 | 10.66 | 0.4722 | 62.69 | Natural rubber, ASTM-2A recipe, cure 140 °C, 0.5 h: R(100g); ZnO(5g); S(2.5g); Stearic acid(2.0g); Altex(1.0g); phenyl beta naphthylamine (antioxidant) (1.0g); Samples 8x8x½ in., No.1,6 | Slab | 1.0406 | NBS, Rubber Section | NBS Gum Rubber | 18.46 | 0.138601 | 0.024409 | NIST SRD 81 API | ASTM C 177 |
| nbs gum rubber | 1538 | 6/30/1964 | 10.53 | 0.4782 | 61.75 | Natural rubber, ASTM-2A recipe, cure 140 °C, 0.5 h: R(100g); ZnO(5g); S(2.5g); Stearic acid(2.0g); Altex(1.0g); phenyl beta naphthylamine (antioxidant) (1.0g); Samples 8x8x½ in., No.1,6 | Slab | 1.0636 | NBS, Rubber Section | NBS Gum Rubber | 70.4 | 0.135604 | 0.023881 | NIST SRD 81 API | ASTM C 177 |
| nbs gum rubber | 1539 | 7/1/1964 | 10.56 | 0.4798 | 61.83 | Natural rubber, ASTM-2A recipe, cure 140 °C, 0.5 h: R(100g); ZnO(5g); S(2.5g); Stearic acid(2.0g); Altex(1.0g); phenyl beta naphthylamine (antioxidant) (1.0g); Samples 8x8x½ in., No.1,6 | Slab | 1.0652 | NBS, Rubber Section | NBS Gum Rubber | 70.44 | 0.1354 | 0.023845 | NIST SRD 81 API | ASTM C 177 |
| nbs gum rubber | 1540 | 7/2/1964 | 20.65 | 0.9628 | 61.56 | Natural rubber, ASTM-2A recipe, cure 140 °C, 0.5 h: R(100g); ZnO(5g); S(2.5g); Stearic acid(2.0g); Altex(1.0g); phenyl beta naphthylamine (antioxidant) (1.0g); Samples 8x8x½ in., No.1,6 | Slab | 1.0517 | NBS, Rubber Section | NBS Gum Rubber | 72.18 | 0.137138 | 0.024151 | NIST SRD 81 API | ASTM C 177 |
| nbs gum rubber | 1648 | 3/28/1966 | 18.55 | 0.6854 | 61.85 | Natural rubber, ASTM-2A recipe, cure 140 °C, 0.5 h: R(100g); ZnO(5g); S(2.5g); Stearic acid(2.0g); Altex(1.0g); phenyl beta naphthylamine (antioxidant) (1.0g); Samples 8x8x3/4 in., No. 1,3,5 & 2,4,6 | Slab | 1.0487 | NBS, Rubber Section | NBS Gum Rubber | 70.15 | 0.13753 | 0.02422 | NIST SRD 81 API | ASTM C 177 |
What else is in Engineering Database
Iron Engine ↗Engineering AI at ironengine.ai
AI built for engineering. Searches the engineering database, performs calculations, gives source-backed engineering insights.
Get started for free ↗Reference Data375 engineering tablesMaterial properties, pipe and shape dimensions, code tables, and electrical ratings across mechanical, civil, chemical, electrical, materials, and manufacturing engineering.
Browse dataCalculatorsDeterministic engineering calculatorsSizing, checking, and conversion tools that run against the reference tables. Inputs are code-compliant, outputs are traceable to the source standard.
Browse calculators