GB709125A - Improvements in or relating to moulding mixtures - Google Patents
Improvements in or relating to moulding mixturesInfo
- Publication number
- GB709125A GB709125A GB1496551A GB1496551A GB709125A GB 709125 A GB709125 A GB 709125A GB 1496551 A GB1496551 A GB 1496551A GB 1496551 A GB1496551 A GB 1496551A GB 709125 A GB709125 A GB 709125A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- sand
- mixture
- plumbago
- resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
In a moulding mixture comprising sand with from 2 1/2 per cent. to 12 per cent. of a finely-divided thermosetting resin binder and a hardening agent, the sand is a mixture of two or more sands from different sources and contains a sufficient proportion of large grains to give strength without causing a segregation of the binder and a sufficient proportion of small grains to give the required smoothness of surface. The sand preferably comprises equal parts of Bedford silica sand which is relatively coarse, about 75 per cent. being retained on a number 72 British Standard Sieve and "H" sand which is finer, about 88 per cent., passing a number 120 B.S. Sieve. The mixture may contain between 1 per cent. and 9 per cent. plumbago or 1 - 6 per cent. of terra-flake or mixture of plumbago and terra-flake. A preferred composition is Bedford silica sand and "H" sand, 46.75 per cent. of each; resin binder, including a hardening agent, 5 per cent.; plumbago, 1.5 per cent. A phenol resin, cresol resin or urea resin may be used but phenol formaldehyde is preferred, with hexamine as a hardening agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1496551A GB709125A (en) | 1951-06-23 | 1951-06-23 | Improvements in or relating to moulding mixtures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1496551A GB709125A (en) | 1951-06-23 | 1951-06-23 | Improvements in or relating to moulding mixtures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB709125A true GB709125A (en) | 1954-05-19 |
Family
ID=10050686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1496551A Expired GB709125A (en) | 1951-06-23 | 1951-06-23 | Improvements in or relating to moulding mixtures |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB709125A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3002948A (en) * | 1957-09-12 | 1961-10-03 | American Steel Foundries | Shell mold |
| US5426145A (en) * | 1988-11-10 | 1995-06-20 | Ponce; Marco A. | Tracking-resistant electrical insulators containing silica and alumina filler in a polyester resin matrix |
-
1951
- 1951-06-23 GB GB1496551A patent/GB709125A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3002948A (en) * | 1957-09-12 | 1961-10-03 | American Steel Foundries | Shell mold |
| US5426145A (en) * | 1988-11-10 | 1995-06-20 | Ponce; Marco A. | Tracking-resistant electrical insulators containing silica and alumina filler in a polyester resin matrix |
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