Ubufatanye
UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Chemical-Resistant Gloves: Butyl Latex over Natural Rubber on a Cotton Liner (Hart & Collyer, US 4,190,685, 1980)
Dipped rubber gloves built in layers on a knitted cotton liner: one coat of natural rubber, then five coats of butyl rubber, which lets very little liquid or vapour through. Each coat is dipped from latex on a porcelain hand form, and the whole glove is cured under steam and air pressure. Made in Canada to protect soldiers against chemical warfare agents; worn gloves showed no penetration in 24 hours of field use.
Result: flexible, soft chemical-resistant gloves with a comfortable cotton lining.
Source: J. A. Hart and J. C. Collyer, US 4,190,685 (1980), latex method. Unknown: sizes, the pigments. Picture: the patent drawing.
Hejuru
Unknown
Amabwiriza
1
1
Sew the cotton liner
Sew the cotton liner
Cut knitted or interlock cotton fabric to a glove shape and sew it into a glove. It stretches both ways, soaks up sweat and makes the glove easy to put on and take off. Not given: sizes, the knit.
Ibikoresho by'iyi ntambwe:
Igitambaro cy’ipamba kiboshywe1 linerIbikoresho bikenewe:
Umukasi
Imashini yo kudoda
Ingano zitazwi2
2
Dip in coagulant
Dip in coagulant
Pull the liner onto a porcelain hand form and flame it to smooth off the surface. Dip it in a 10 % solution of acetic acid in acetone, then turn the form for about 2½ minutes at 24 °C until it is dry. The coagulant sets the latex before it can soak through the cloth.
Ibikoresho by'iyi ntambwe:
Asidi asetike (isukuye cyane)1 10 % in acetone
Asetone1 solventIbikoresho bikenewe:
Ikibumbiro cy'agarindantoki
Itara rya Propane3
3
Dip the natural rubber coat
Dip the natural rubber coat
Dip the liner into natural rubber latex (the patent uses LOTOL 1185) and leave it 5 seconds. Draw it out, turn it upside down and let it dry. Scrub the rubber film with an abrasive cleaner, a brush and water, and dry it again.
Ibikoresho by'iyi ntambwe:
Umupira w'igiti karemano1 bath
Isabune isharura1 as neededIbikoresho bikenewe:
Ikibumbiro cy'agarindantoki
Uburoso bwo gukubura4
4
Mix the butyl latex bath
Mix the butyl latex bath
Mix, in parts by dry weight: butyl rubber latex 100, sulphur 3, zinc dibutyldithiocarbamate 4, zinc oxide 5, formaldehyde 0.1 as a preservative, a liquid dithiocarbamate curing accelerator 4 (Merac 255 in the patent), and 6.5 of pigments (olive drab in the patent). Not given: the pigments.
Ibikoresho by'iyi ntambwe:
Latex ya rubber ya butyl100 parts dry
Sufure3 parts
Zinc dibutyldithiocarbamate4 parts
Ifu ya oxide ya zinki5 parts
Umuti wa fomaledehide (fomaline 37 %)0.1 parts formaldehyde
Icyihutisha cya dithiocarbamate gisukika4 parts
Ibikoresho bitazwi6.5 parts pigmentIbikoresho bikenewe:
Igikoresho cyo kuvanga5
5
Dip five butyl coats
Dip five butyl coats
Dip the glove into the butyl latex and draw it out at 10 cm per minute. At once turn the form at about 8 rpm at 24 °C until the film has gelled, then dry it upside down in an oven at 66 °C for 1 hour. Wash, dip and dry again until there are five butyl coats; do not use the abrasive cleaner on the butyl film.
Ibikoresho bikenewe:
Ikibumbiro cy'agarindantoki
Ifuru yo kumishaho6
6
Cure and finish
Cure and finish
Dry the glove at 66 °C for 1 hour. Cure it for 3 hours in a pressure vessel with 30 psi steam in the jacket (131 °C) and 26 psi air in the chamber. Strip the gloves from the forms while hot; when cool, trim them and wash them in soapy water.
Ibikoresho by'iyi ntambwe:
Isabune1 as neededIbikoresho bikenewe:
Otokilave yo ku mezaUmukasiIbikoresho
13- Umwanya
- 1 10 % in acetoneUmwanya
- 1 solventUmwanya
- 1 bathUmwanya
- 1 as neededUmwanya
- 100 parts dryUmwanya
- 3 partsUmwanya
- 4 partsUmwanya
- 5 partsUmwanya
- 0.1 parts formaldehydeUmwanya
- Umwanya
- 6.5 parts pigmentUmwanya
- 1 as neededUmwanya
Ibikoresho bikenewe
9- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
Ibikoresho by'Ibishushanyo Bifitanye Isano
10% igabana
กรีดยางพารา — การเก็บน้ำยางธรรมชาติจากต้นยางพารา
na SomchaiSang
Ubuhinzi
56
0
0
0
1
0
Akaga
10% igabana
Glacial Acetic Acid from Wood Vinegar: Acetate of Soda, Oil of Vitriol and Freezing
na Charlie
By'Inganda
21
0
0
0
1
0
10% igabana
Acetone by Dry Distillation of Acetate of Lime
na Charlie
Ubutabire
36
0
0
0
1
0
10% igabana
Collecting Native Sulfur from Volcanic Deposits
na Peter
Ubutayu
99
0
0
0
6
0
10% igabana
Making Zinc White Pigment — The Non-Toxic Replacement for Lead White
na Charlie
UBUHANZI
70
0
0
0
7
0
Iki gishushanyo gikora
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