By John Pearle
I
have just realised that it has been nearly a year (longer, by the
time you read this) since I had a good rummage round in the
chemicals cupboard. There is a new issue of the price list. Yes they
have gone up, well a few of them have. Not only are some of them
more expensive for us to buy, but the cost of carriage has risen,
too, so this will eventually find it's way to more chemicals as new
supplies arrive. They still represent excellent value.
Please
note that ammonium thiosulphate crystals, item code 4, is now sold
out. It's replacement is the 60% solution, code 5. This keeps better
that the solid.
That
reminds me... remember that most solutions are described on a weight
for weight (w/w) basis rather than the weight per volume (w/v) that
we usually use. This
can be a bit confusing for us weighers and mixers who are not used
to weighing liquids. I know we do sometimes, but it is unusual.
To use this as an example, ammonium thiosulphate 60% solution
contains 60 grams of ammonium thiosulphate for each 100 grams of
solution. In this case, 100 ml of solution contains 79 grams of
thiosulphate. So it is (roughly) an 80% w/v solution.
The same applies to other solutions, so remember when you are
using a solution instead of the solid form called for by your
recipe, that the solution you are using might be stronger than it
appears from the label.
To simplify things somewhat, the there is a Club Chemicals
note which gives this information for many of the chemicals stocked.
If Bill has enough space in this issue of the News, perhaps he can
fit it in. Otherwise, just send me a stamped addressed envelope, it
doesn't need to be a big one, and I will send you one. The address
is on the price list.
CRC
CHEMICALS - PRICE LIST - AUGUST 2001
PRICE
NAME
CODE
PENCE PER
10g OR 10 ml
ACETIC ACID, GLACIAL
1
8.7 Limited stock, use code
no 61.
AMMONIUM PERSULPHATE
2
12.1
ALUMINIUM POTASSIUM SULPHATE.
3
7.9
AMMONIUM THIOSULPHATE.
4
8 Out of stock. Use code no 5.
AMMONIUM THIOSULPHATE SOLUTION, 60%
5
5.6
BENZOTRIAZOLE.
6
124
BENZYL ALCOHOL
7
9.2
BORAX
8
5.9
ANTI-CALCIUM NO5.
9
13.1
CD 3.
10
68.4
CITRAZINIC ACID
11
97.4
DIMEZONE 'S'
12
112.3
EDTA
13
18.7
EDTA Na2
14
20.9
EDTA NaFe
15
17
ETHYLENE DIAMINE, 50% v/v.
16
23.3
ETHYLENE GLYCOL
17
18 Out of stock, use
code no 57.
FORMALDEHYDE, 30%
18
5.8
GENOCHROME
19
42
HS 104
20
85.3
HYDROQUINONE
21
18.5
HYDROXYLAMINE SULPHATE
22 16
METOL
23 43.1
ORTHOPHOSPHORIC ACID
24 9.2
SODIUM METABORATE, 4H2O.
25 6.5
p-AMINOPHENOL
26 145.8
POTASSIUM BROMIDE
27 10.8
POTASSIUM CARBONATE, ANH
28 6.4
POTASSIUM DICHROMATE
29 22.9
POTASSIUM FERRICYANIDE
30 15.5
POTASSIUM HYDROXIDE
31 5.9
POTASSIUM HYDROQUINONE MONOSULPHONATE
32 77.4
POTASSIUM IODIDE
33 56
POTASSIUM METABISULPHITE
34 5.2
POTASSIUM NITRATE
35 16
POTASSIUM THIOCYANATE
36 32.5
PROPIONIC ACID
37 10.4
SODIUM ACETATE, ANH
38 8
SODIUM BICARBONATE
39 4
SODIUM BROMIDE
40
12.4
SODIUM CARBONATE, ANH
41 5.4
SODIUM DIHYDROGEN ORTHOPHOSPHATE
42 29
SODIUM HEXAMETAPHOSPHATE
43 13
DISODIUM HYDROGEN PHOSPHATE, 12H2O
44 13
SODIUM HYDROXIDE
45
4.3
SODIUM METABISULPHITE
46 4.7
SODIUM SULPHITE, ANH
47 5.1
SODIUM THIOCYANATE
48 22.9
SODIUM THIOSULPHATE, 5H2O
49 5.2
STANNOUS CHLORIDE, 2H2O
50 31.1
THIOGLYCEROL
51 127.8
THIOUREA
52 12.4
CD4
53 82.3
FERRIC AMMONIUM EDTA SOLUTION, 50%
54
8.1
NITRIC ACID, 25%.
55 2.3
WETTING AGENT.
56 5.6
DIETHYLENE GLYCOL
57 7.7
AMMONIA SOLUTION, 30%
58 4
N,N - DIETHYL HYDROXYLAMINE
59 31
ANTI-CALCIUM No4.
60 10.4
ACETIC ACID, 80%
61 3.9
DISODIUM HYDROGEN ORTHOPHOSPHATE, ANH.
62 8.2
POTASSIUM PERMANGANATE
63 11.5
POTASSIUM THIOCYANATE, 20%
64 7.5
6-NITROBENZIMIDAZOLE NITRATE
65 145.1
HYDROXYLAMINE HYDROCHLORIDE.
66 55.4
SODIUM CHLORIDE
67 6.3
DISODIUM TETRABORATE, ANH.
68 5.4
POTASSIUM CHLORIDE
69 9.7
KODALK
70 9.4
POTASSIUM DIHYDROGEN ORTHOPHOSPHATE
71 13.9
BORIC ACID
72 8.5
SODIUM SULPHATE, 10H2O
73
2.8
TRI SODIUM ORTHOPHOSPHATE
74 10.9
PYROGALLOL
75 208.1
TRIETHANOLAMINE
76 9
SODIUM SULPHIDE
77 11.4
AMMONIUM THIOCYANATE
78 22.9
ISOPROPYL ALCOHOL
79 6.3
SODIUM ACETATE, 3H2O
80 10
POTASSIUM SULPHITE SOLUTION,45%
81 4.8
AMMONIUM BROMIDE
82 14.4
CITRIC ACID, MONOHYDRATE
83 9.8
PLEASE
NOTE...
---------------
Some
chemicals cannot be posted, and may be sent by a different carrier. Packing
costs 40p per order. Carriage will be charged at cost.
Prices are per 10g or
10 ml, order what you want in multiples of 10g and the price will be
in proportion. Odd quantities will normally be rounded up tothe
nearest 10g or 10 ml.
The
packing in which these chemicals are sent may not be suitable for
long term storage. If you do not have a suitable container of your
own, please say on your order that you need a storage container.
Orders
will normally include safety data which may be in the form of a
Material Safety Data Sheet (MSDS). These contain first aid and other
useful information. They may not be of UK origin and are not
intended to fulfil any legal requirements. Don't throw them away
since we will not normally send repeats with future orders.
Many
chemicals go under a variety of names, the ones used here are those
that have appeared in previous lists, if you have any queries or are
unsure of the identity of a chemical, please ask.
The bill will normally
be included with the order.
Send
your order to:-
John
Pearle,
1, Eldon
Close, Colchester, Essex. CO4 3HA,
or
thepearles@compuserve.com or
01206 861604.