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7787-49-7生产厂家

7787-49-7价格

7787-49-7

7787-49-7结构式
7787-49-7结构式

化源商城直购

中文名 氟化铍
英文名 beryllium difluoride
英文别名 BeF2
berylliumfluoride(bef2)
EINECS 232-118-5
Beryllium fluoride(Be2F4)
Beryllium difluoride
BERYLLIUM FLUORIDE
MFCD00014194
密度 1.98
沸点 1175ºC
熔点 545ºC
分子式 BeF2
分子量 47.00900
精确质量 47.00900
LogP 0.84040
储存条件

本品应密封干燥保存。

稳定性

加热即软化,无明显熔点,800℃时变成流动液体。可以任何比例溶于水,但不溶于氢氟酸,略溶于无水乙醇,可溶于90%的乙醇。注意有毒。

更多

1. 性状:玻璃状无色晶体,属四方晶系。有吸湿性。

2. 密度(g/mL,25/4℃):1.986

3. 相对蒸汽密度(g/mL,空气=1):未确定

4. 熔点(ºC):550

5. 沸点(ºC,常压):未确定

6. 沸点(ºC,5.2kPa):未确定

7. 折射率:未确定

8. 闪点(ºC): 未确定

9. 比旋光度(º):未确定

10. 自燃点或引燃温度(ºC):未确定

11. 蒸气压(kPa,25ºC):未确定

12. 饱和蒸气压(kPa,60ºC):未确定

13. 燃烧热(KJ/mol):未确定

14. 临界温度(ºC):未确定

15. 临界压力(KPa):未确定

16. 油水(辛醇/水)分配系数的对数值:未确定

17. 爆炸上限(%,V/V):未确定

18. 爆炸下限(%,V/V):未确定

19. 溶解性:易溶于水,微溶于乙醇而较多溶于乙醇和乙醚的混合液,不溶于无水氟化氢。

化学品中文名称:
氟化铍
化学品英文名称:
berylium fluoride
中文名称 2
二氟化铍
英文名称 2
berylium difluoride
技术说明书编码:
2337
CAS No.
7787-49-7
分子式:
BeF2
分子量:
47.01
有害物成分
含量
CAS No.
氟化铍
7787-49-7
危险性类别:
侵入途径:
健康危害:
对眼睛、皮肤、粘膜和上呼吸道有强烈刺激性,吸入可致鼻炎、气管炎、肺炎等。个别人,可发生肝肿大。可有接触性皮炎和过敏性皮炎。可引起皮肤溃疡。
环境危害:
对环境有危害,对水体可造成污染。
燃爆危险:
本品不燃,有毒,为致癌物,具强刺激性。
皮肤接触:
脱去污染的衣着,用大量流动清水冲洗。
眼睛接触:
提起眼睑,用流动清水或生理盐水冲洗。就医。
吸入:
迅速脱离现场至空气新鲜处。保持呼吸道通畅。如呼吸困难,给输氧。如呼吸停止,立即进行人工呼吸。就医。
食入:
饮足量温水,催吐。就医。
危险特性:
受高热或接触酸或酸雾放出剧毒的烟雾。
有害燃烧产物:
氟化氢、氧化铍。
灭火方法:
消防人员必须穿全身防火防毒服,在上风向灭火。灭火时尽可能将容器从火场移至空旷处。然后根据着火原因选择适当灭火剂灭火。
应急处理:
隔离泄漏污染区,限制出入。建议应急处理人员戴防尘口罩,穿防毒服。不要直接接触泄漏物。小量泄漏:小心扫起,收集于密闭容器中。大量泄漏:收集回收或运至废物处理场所处置。
操作注意事项:
密闭操作,提供充分的局部排风。防止粉尘释放到车间空气中。操作人员必须经过专门培训,严格遵守操作规程。建议操作人员佩戴防尘面具(全面罩),穿胶布防毒衣,戴橡胶手套。避免产生粉尘。避免与酸类接触。配备泄漏应急处理设备。倒空的容器可能残留有害物。
储存注意事项:
储存于阴凉、通风的库房。远离火种、热源。防止阳光直射。包装密封。应与酸类、食用化学品分开存放,切忌混储。储区应备有合适的材料收容泄漏物。
职业接触限值
中国 MAC(mg/m3)
1(F)
前苏联 MAC(mg/m3)
未制定标准
TLVTN
0.002mg(Be)/m3
TLVWN
0.025mg(Be)/m3(CL)
监测方法:
氟试剂 - 镧盐比色法
工程控制:
严加密闭,提供充分的局部排风。
呼吸系统防护:
可能接触其粉尘时,必须佩戴防尘面具(全面罩)。紧急事态抢救或撤离时,应该佩戴空气呼吸器。
眼睛防护:
呼吸系统防护中已作防护。
身体防护:
穿胶布防毒衣。
手防护:
戴橡胶手套。
其他防护:
工作现场禁止吸烟、进食和饮水。工作完毕,淋浴更衣。保持良好的卫生习惯。
主要成分:
外观与性状:
白色粉末或结晶。
pH
熔点 ( )
552
沸点 ( )
1175
相对密度 ( =1)
1.9860
相对蒸气密度 ( 空气 =1)
无资料
饱和蒸气压 (kPa)
无资料
燃烧热 (kJ/mol)
无意义
临界温度 ( )
无意义
临界压力 (MPa)
无意义
辛醇 / 水分配系数的对数值:
无资料
闪点 ( )
无意义
引燃温度 ( )
无意义
爆炸上限 %(V/V)
无意义
爆炸下限 %(V/V)
无意义
溶解性:
易溶于水、,溶于乙醇,不溶于硝酸。
主要用途:
用于核反应器,制造铍及铍合金及玻璃工业。
其它理化性质:
稳定性:
禁配物:
强酸。
避免接触的条件:
聚合危害:
分解产物:
急性毒性:
LD50 98 mg/kg( 大鼠经口 )

LC50
:无资料
亚急性和慢性毒性:
刺激性:
致敏性:
致突变性:
致畸性:
致癌性:
生态毒理毒性:
生物降解性:
非生物降解性:
生物富集或生物积累性:
其它有害作用:
该物质对环境有危害,建议不要让其进入环境。应特别注意对水体的污染。
废弃物性质:
废弃处置方法:
用安全掩埋法处置。在能利用的地方重复使用容器或在规定场所掩埋。
废弃注意事项:
危险货物编号:
61025
UN 编号:
1566
包装标志:
包装类别:
包装方法:
螺纹口玻璃瓶、铁盖压口玻璃瓶、塑料瓶或金属桶(罐)外普通木箱。
运输注意事项:
铁路运输时应严格按照铁道部《危险货物运输规则》中的危险货物配装表进行配装。运输前应先检查包装容器是否完整、密封,运输过程中要确保容器不泄漏、不倒塌、不坠落、不损坏。严禁与酸类、氧化剂、食品及食品添加剂混运。运输时运输车辆应配备泄漏应急处理设备。运输途中应防曝晒、雨淋,防高温。公路运输时要按规定路线行驶,勿在居民区和人口稠密区停留。
法规信息
化学危险物品安全管理条例 (1987 2 17 日国务院发布 ) ,化学危险物品安全管理条例实施细则 ( 化劳发 [1992] 677 ) ,工作场所安全使用化学品规定 ([1996] 劳部发 423 ) 等法规,针对化学危险品的安全使用、生产、储存、运输、装卸等方面均作了相应规定;常用危险化学品的分类及标志 (GB 13690-92) 将该物质划为第 6.1 类毒害品。
参考文献:
填表时间:
填表部门:
数据审核单位:
修改说明:
其他信息:
MSDS 修改日期:

生态学数据:

1、其它有害作用:该物质对环境有危害,建议不要让其进入环境。应特别注意对水体的污染。

CHEMICAL IDENTIFICATION

RTECS NUMBER :
DS2800000
CHEMICAL NAME :
Beryllium fluoride
CAS REGISTRY NUMBER :
7787-49-7
LAST UPDATED :
199712
DATA ITEMS CITED :
70
MOLECULAR FORMULA :
Be-F2
MOLECULAR WEIGHT :
47.01
WISWESSER LINE NOTATION :
BE F2

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
98 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
XEURAQ U.S. Atomic Energy Commission, University of Rochester, Research and Development Reports. (Rochester, NY) Volume(issue)/page/year: UR-154,1951
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
100 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
XPHPAW U.S. Public Health Service Publication. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) No.1- 1950- Volume(issue)/page/year: 2173,23,1972
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Subcutaneous
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
20 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
XPHPAW U.S. Public Health Service Publication. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) No.1- 1950- Volume(issue)/page/year: 2173,23,1972
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intravenous
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
1800 ug/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
XPHPAW U.S. Public Health Service Publication. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) No.1- 1950- Volume(issue)/page/year: 2173,23,1972
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Rodent - hamster
DOSE/DURATION :
21 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
XEURAQ U.S. Atomic Energy Commission, University of Rochester, Research and Development Reports. (Rochester, NY) Volume(issue)/page/year: UR-154,1951 ** OTHER MULTIPLE DOSE TOXICITY DATA **
TYPE OF TEST :
TCLo - Lowest published toxic concentration
ROUTE OF EXPOSURE :
Inhalation
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
1 mg/m3/6H/30W-I
TOXIC EFFECTS :
Related to Chronic Data - death
REFERENCE :
AMIHBC AMA Archives of Industrial Hygiene and Occupational Medicine. (Chicago, IL) V.2-10, 1950-54. For publisher information, see AEHLAU. Volume(issue)/page/year: 8,493,1953
TYPE OF TEST :
TCLo - Lowest published toxic concentration
ROUTE OF EXPOSURE :
Inhalation
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
10 mg/m3/6H/15D-I
TOXIC EFFECTS :
Nutritional and Gross Metabolic - weight loss or decreased weight gain Related to Chronic Data - death
REFERENCE :
AMIHBC AMA Archives of Industrial Hygiene and Occupational Medicine. (Chicago, IL) V.2-10, 1950-54. For publisher information, see AEHLAU. Volume(issue)/page/year: 8,493,1953
TYPE OF TEST :
TCLo - Lowest published toxic concentration
ROUTE OF EXPOSURE :
Inhalation
SPECIES OBSERVED :
Mammal - dog
DOSE/DURATION :
1 mg/m3/6H/30W-I
TOXIC EFFECTS :
Lungs, Thorax, or Respiration - other changes Blood - other changes Related to Chronic Data - death
REFERENCE :
AMIHBC AMA Archives of Industrial Hygiene and Occupational Medicine. (Chicago, IL) V.2-10, 1950-54. For publisher information, see AEHLAU. Volume(issue)/page/year: 8,493,1953
TYPE OF TEST :
TCLo - Lowest published toxic concentration
ROUTE OF EXPOSURE :
Inhalation
SPECIES OBSERVED :
Mammal - cat
DOSE/DURATION :
10 mg/m3/6H/30W-I
TOXIC EFFECTS :
Nutritional and Gross Metabolic - weight loss or decreased weight gain
REFERENCE :
AMIHBC AMA Archives of Industrial Hygiene and Occupational Medicine. (Chicago, IL) V.2-10, 1950-54. For publisher information, see AEHLAU. Volume(issue)/page/year: 8,493,1953
TYPE OF TEST :
TCLo - Lowest published toxic concentration
ROUTE OF EXPOSURE :
Inhalation
SPECIES OBSERVED :
Rodent - rabbit
DOSE/DURATION :
1 mg/m3/6H/30W-I
TOXIC EFFECTS :
Kidney, Ureter, Bladder - other changes in urine composition Blood - other changes
REFERENCE :
AMIHBC AMA Archives of Industrial Hygiene and Occupational Medicine. (Chicago, IL) V.2-10, 1950-54. For publisher information, see AEHLAU. Volume(issue)/page/year: 8,493,1953
TYPE OF TEST :
TCLo - Lowest published toxic concentration
ROUTE OF EXPOSURE :
Inhalation
SPECIES OBSERVED :
Rodent - guinea pig
DOSE/DURATION :
10 mg/m3/6H/30W-I
TOXIC EFFECTS :
Nutritional and Gross Metabolic - weight loss or decreased weight gain Related to Chronic Data - death
REFERENCE :
AMIHBC AMA Archives of Industrial Hygiene and Occupational Medicine. (Chicago, IL) V.2-10, 1950-54. For publisher information, see AEHLAU. Volume(issue)/page/year: 8,493,1953 ** TUMORIGENIC DATA **
TYPE OF TEST :
TCLo - Lowest published toxic concentration
ROUTE OF EXPOSURE :
Inhalation
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
20 ug/m3/1H/17W-I
TOXIC EFFECTS :
Tumorigenic - equivocal tumorigenic agent by RTECS criteria Lungs, Thorax, or Respiration - tumors
REFERENCE :
GTPZAB Gigiena Truda i Professional'nye Zabolevaniya. Labor Hygiene and Occupational Diseases. (V/O Mezhdunarodnaya Kniga, 113095 Moscow, USSR) V.1-36, 1957-1992. For publisher information, see MTPEEI Volume(issue)/page/year: 19(7),34,1975
TYPE OF TEST :
TC - Toxic concentration (other than lowest)
ROUTE OF EXPOSURE :
Inhalation
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
49 ug/m3/26W
REFERENCE :
PEXTAR Progress in Experimental Tumor Research. (S. Karger AG, Postfach CH-4009 Basel, Switzerland) V.1- 1960- Volume(issue)/page/year: 2,203,1961 *** REVIEWS *** ACGIH TLV-SUSPECTED HUMAN CARCINOGEN 85INA8 "Documentation of the Threshold Limit Values and Biological Exposure Indices," 5th ed., Cincinnati, OH, American Conference of Governmental Industrial Hygienists, Inc., 1986 Volume(issue)/page/year: 6,1/BEI,1997 ACGIH TLV-TWA 0.002 mg(Be)/m3 DTLVS* The Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) booklet issues by American Conference of Governmental Industrial Hygienists (ACGIH), Cincinnati, OH, 1996 Volume(issue)/page/year: TLV/BEI,1997 ACGIH TLV-TWA 2.5 mg(F)/m3 DTLVS* The Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) booklet issues by American Conference of Governmental Industrial Hygienists (ACGIH), Cincinnati, OH, 1996 Volume(issue)/page/year: TLV/BEI,1997 ACGIH TLV-Suspected human carcinogen DTLVS* The Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) booklet issues by American Conference of Governmental Industrial Hygienists (ACGIH), Cincinnati, OH, 1996 Volume(issue)/page/year: TLV/BEI,1997 IARC Cancer Review:Animal Sufficient Evidence IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man. (WHO Publications Centre USA, 49 Sheridan Ave., Albany, NY 12210) V.1- 1972- Volume(issue)/page/year: 23,143,1980 IARC Cancer Review:Animal Sufficient Evidence IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man. (WHO Publications Centre USA, 49 Sheridan Ave., Albany, NY 12210) V.1- 1972- Volume(issue)/page/year: 58,41,1993 IARC Cancer Review:Human Sufficient Evidence IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man. (WHO Publications Centre USA, 49 Sheridan Ave., Albany, NY 12210) V.1- 1972- Volume(issue)/page/year: 58,41,1993 IARC Cancer Review:Group 1 IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man. (WHO Publications Centre USA, 49 Sheridan Ave., Albany, NY 12210) V.1- 1972- Volume(issue)/page/year: 58,41,1993 TOXICOLOGY REVIEW CTOXAO Clinical Toxicology. (New York, NY) V.1-18, 1968-81. For publisher information, see JTCTDW. Volume(issue)/page/year: 6,497,1973 TOXICOLOGY REVIEW AMIHBC AMA Archives of Industrial Hygiene and Occupational Medicine. (Chicago, IL) V.2-10, 1950-54. For publisher information, see AEHLAU. Volume(issue)/page/year: 8,1,1953 *** U.S. STANDARDS AND REGULATIONS *** OSHA PEL (Gen Indu):8H TWA 0.002 mg(Be)/m3 CFRGBR Code of Federal Regulations. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) Volume(issue)/page/year: 29,1910.1000,1994 OSHA PEL (Gen Indu):8H TWA 2.5 mg(F)/m3 CFRGBR Code of Federal Regulations. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) Volume(issue)/page/year: 29,1910.1000,1994 OSHA PEL (Construc):8H TWA 0.002 mg(Be)/m3 CFRGBR Code of Federal Regulations. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) Volume(issue)/page/year: 29,1926.55,1994 OSHA PEL (Construc):8H TWA 2.5 mg(F)/m3 CFRGBR Code of Federal Regulations. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) Volume(issue)/page/year: 29,1926.55,1994 OSHA PEL (Shipyard):8H TWA 0.002 mg(Be)/m3 CFRGBR Code of Federal Regulations. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) Volume(issue)/page/year: 29,1915.1000,1993 OSHA PEL (Shipyard):8H TWA 2.5 mg(F)/m3 CFRGBR Code of Federal Regulations. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) Volume(issue)/page/year: 29,1915.1000,1993 OSHA PEL (Fed Cont):8H TWA 0.002 mg(Be)/m3 CFRGBR Code of Federal Regulations. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) Volume(issue)/page/year: 41,50-204.50,1994 OSHA PEL (Fed Cont):8H TWA 2.5 mg(F)/m3 CFRGBR Code of Federal Regulations. (U.S. Government Printing Office, Supt. of Documents, Washington, DC 20402) Volume(issue)/page/year: 41,50-204.50,1994 *** OCCUPATIONAL EXPOSURE LIMITS *** OEL-ARAB Republic of Egypt:TWA 0.002 mg(Be)/m3 JAN 1993 OEL-AUSTRALIA:TWA 0.002 mg(Be)/m3;Carcinogen JAN 1993 OEL-AUSTRALIA:TWA 2.5 mg(F)/m3 JAN 1993 OEL-BELGIUM:TWA 0.002 mg(Be)/m3;Carcinogen JAN 1993 OEL-BELGIUM:TWA 2.5 mg(F)/m3 JAN 1993 OEL-DENMARK:TWA 0.001 mg(Be)/m3;Carcinogen JAN 1993 OEL-DENMARK:TWA 2.5 mg(F)/m3 JAN 1993 OEL-FINLAND:TWA 0.002 mg(Be)/m3;STEL 0.006 mg(Be)/m3;Carcinogen JAN 1993 OEL-FINLAND:TWA 2.5 mg(F)/m3 JAN 1993 OEL-FRANCE:TWA 0.002 mg(Be)/m3;Carcinogen JAN 1993 OEL-FRANCE:TWA 2.5 mg(F)/m3 JAN 1993 OEL-GERMANY:TWA 2.5 mg(F)/m3 JAN 1993 OEL-GERMANY;Carcinogen JAN 1993 OEL-HUNGARY:STEL 0.001 mg(Be)/m3;Carcinogen JAN 1993 OEL-HUNGARY:TWA 1 mg(F)/m3;STEL 2 mg(F)/m3 JAN 1993 OEL-INDIA:TWA 0.002 mg(Be)/m3;Carcinogen JAN 1993 OEL-JAPAN:TWA 0.002 mg(Be)/m3;Carcinogen JAN 1993 OEL-THE NETHERLANDS:TWA 0.002 mg(Be)/m3 JAN 1993 OEL-THE NETHERLANDS:TWA 2.5 mg(F)/m3 JAN 1993 OEL-THE PHILIPPINES:TWA 0.002 mg(Be)/m3 JAN 1993 OEL-THE PHILIPPINES:TWA 2.5 mg(F)/m3 JAN 1993 OEL-POLAND:TWA 0.001 mg(Be)/m3 JAN 1993 OEL-POLAND:TWA 1 mg(F)/m3 JAN 1993 OEL-RUSSIA:STEL 0.001 mg(Be)/m3;Carcinogen JAN 1993 OEL-SWEDEN:TWA 0.002 mg(Be)/m3;Carcinogen JAN 1993 OEL-SWEDEN:TWA 2 mg(F)/m3 JAN 1993 OEL-SWITZERLAND:TWA 0.002 mg(Be)/m3;Carcinogen JAN 1993 OEL-SWITZERLAND:TWA 1.8 ppm (1.5 mg(F)/m3);STEL 9.0 ppm JAN 1993 OEL-THAILAND:TWA 0.002 mg(Be)/m3;STEL 0.005 mg(Be)/m3 JAN 1993 OEL-THAILAND:TWA 2.5 mg(F)/m3 JAN 1993 OEL-TURKEY:TWA 0.002 mg(Be)/m3 JAN 1993 OEL-TURKEY:TWA 2.5 mg(F)/m3 JAN 1993 OEL-UNITED KINGDOM:TWA 0.002 mg(Be)/m3 JAN 1993 OEL-UNITED KINGDOM:TWA 2.5 mg(F)/m3 JAN 1993 OEL IN BULGARIA, COLOMBIA, JORDAN, KOREA check ACGIH TLV OEL IN NEW ZEALAND, SINGAPORE, VIETNAM check ACGIH TLV *** NIOSH STANDARDS DEVELOPMENT AND SURVEILLANCE DATA *** NIOSH RECOMMENDED EXPOSURE LEVEL (REL) : NIOSH REL TO BERYLLIUM-air:CA not to exceed 0.0005 mg(Be)/m3 REFERENCE : NIOSH* National Institute for Occupational Safety and Health, U.S. Dept. of Health, Education, and Welfare, Reports and Memoranda. Volume(issue)/page/year: DHHS #92-100,1992

危害码 (欧洲) T+:Verytoxic;N:Dangerous for the environment;
风险声明 (欧洲) R25;R26;R36/37/38;R43;R48/23;R49;R51/53
安全声明 (欧洲) S45-S53-S61
危险品运输编码 UN1566
包装等级 II
危险类别 6.1

首先制备四氟铍酸铵。将氧化铍或碳酸铍溶于25%的氟化氢铵的水溶液中,在铂制容器中加热浓缩,则制得四氟铍酸铵结晶。将(NH4)2BeF4置于铂舟中,在干燥的空气流中加热至赤热,NH4F逸出,呈透明玻璃状的氟化铍残留下来。