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Research findings
Filter-difference study
Against the 15-record High Purity Quartz Semiconductor Materials Keyword Candidate Study, this 14-record cohort shares 11 records. Only 3 occur here and 4 only in the reference; the union contains 18. These are filter-membership differences, not company entries or exits.
| Company cohort | Directly linked pages | Share of public archive | Archive date |
|---|---|---|---|
| 14 | 14 | 0.1% | 2026-10-16 |
Deduplicated company IDs.
Filter differences and comparison link
The largest recorded sub-industry participation gap is for Specialty glass and quartz: 9/14 here versus 12/15 in the reference, an absolute difference of 15.7 percentage points. The cohorts have overlapping company IDs and are not independent samples.
| sub-industry | Focal count/base | Reference count/base | Participation gap (pp) |
|---|---|---|---|
| Specialty glass and quartz | 9/14 | 12/15 | -15.7 |
| General industrial equipment and automation | 2/14 | 0/15 | +14.3 |
| Advanced ceramics | 1/14 | 0/15 | +7.1 |
| Functional materials and advanced-material platforms | 1/14 | 2/15 | -6.2 |
Zero means no recorded label, not no business; multi-label cells overlap.
Counts within parent sets
| Set | All records | This subset | Excluding this subset |
|---|---|---|---|
| All public archive records | 19,297 | 14 | 19,283 |
Observed labels
| Dimension | Label | Count/base | Participation |
|---|---|---|---|
| reporting jurisdiction | Jiangsu | 5/14 | 35.7% |
| reporting jurisdiction | Ningbo | 2/14 | 14.3% |
| reporting jurisdiction | Liaoning | 2/14 | 14.3% |
| reporting jurisdiction | Shanghai | 1/14 | 7.1% |
| reporting jurisdiction | Inner Mongolia | 1/14 | 7.1% |
| industry | Advanced materials | 12/14 | 85.7% |
| industry | Advanced equipment | 2/14 | 14.3% |
Multi-label counts can overlap; filter compliance is not industrial advantage.
Evidence and list-linkage counts
| Measure | Count |
|---|---|
| Companies with existing sourced excerpts | 7/14 |
| Existing reviewed bilingual excerpt pairs | 8 |
| IDs linked to 2026 local lists | 4/14 |
Existing excerpts do not certify entire old reports; list linkage is not final recognition. Full definitions are on the series page.
How candidates match
| Field | Matches/candidates |
|---|---|
| Name | 3/14 |
| Product field | 13/14 |
| Sub-industry | 0/14 |
Fields can overlap; hits establish search relevance only.
Recorded roles and delivery checks
Related studies and shared records
| Comparison study | Reference records | Shared IDs | Focal only | Intersection/union |
|---|---|---|---|---|
| High Purity Quartz Semiconductor Materials Keyword Candidate Study | 15 | 11 | 3 | 61.1% |
| Semiconductor Ceramic Quartz Consumables Keyword Candidate Study | 74 | 11 | 3 | 14.3% |
Company samples and record links
| Company | Jurisdiction | Recorded industry |
|---|---|---|
| Jinzhou Youxin Quartz Technology Co., Ltd. | Liaoning | Advanced materials |
| Shanghai Qianghua Industrial Corporation | Shanghai | Advanced materials |
| Ningbo Volken Technology Group Co., Ltd. | Ningbo | Advanced equipment |
| Hanjiang Hongyuan Xiangyang Silicon Carbide Special Ceramics Co., Ltd. | Hubei | Advanced materials |
| Ferrotec(Zhejiang)Quartz Technology Co., Ltd. | Zhejiang | Advanced materials |
| Beijing KaiDe Quartz Co., Ltd. | Beijing | Advanced materials |
| Jiangsu Hongyang Quartz Products Co., Ltd. | Jiangsu | Advanced materials |
| Wuxi Shangling Quartz Technology Co., Ltd. | Jiangsu | Advanced materials |
Directly related profiles and reports
| Page | Presentation |
|---|---|
| Jinzhou Youxin Quartz Technology Co., Ltd. | Company data profile |
| Shanghai Qianghua Industrial Corporation | Company report page |
| Ningbo Volken Technology Group Co., Ltd. | Company report page |
| Hanjiang Hongyuan Xiangyang Silicon Carbide Special Ceramics Co., Ltd. | Company data profile |
| Ferrotec(Zhejiang)Quartz Technology Co., Ltd. | Company data profile |
| Beijing KaiDe Quartz Co., Ltd. | Company data profile |