Hummel Croton Inc. has been in business since 1913 supplying specialty and custom manufactured chemicals to meet our customer's demands. We have the capability of meeting government specifications for most of the products in this catalog. We have the capacity to produce pilot plant to truckload quantities of specialty chemicals. We invite your inquires.

Our Production Equipment List includes:

• Glass lined Reactors
• Stainless Steel Reactors
• Stainless Steel and Carbon Steel Blenders
• Vacuum Drying Equipment
• Stainless Steel Tray Driers
• Stainless Steel Milling and Grinding Equipment
• Stainless Steel Screening Equipment

Our in-house laboratory has the expertise to perform most wet chemical analysis along with some instrumental analysis. Our testing equipment includes.

• Glass lined Reactors
• Stainless Steel Reactors
• Stainless Steel and Carbon Steel Blenders
• Vacuum Drying Equipment
• Stainless Steel Tray Driers
• Stainless Steel Milling and Grinding Equipment
• Stainless Steel Screening Equipment

Custom milling, blending and screening of our product and yours are available at a reasonable cost. Your special mesh requirements on many of the products in this catalog are available at an extra cost.

Items prepared to customers' specifications, government specifications and the like, require substantial lead times for either procurement or manufacturing of raw materials. These raw materials also require special processing and testing for conformance to these specifications. Please allow sufficient time in the ordering procedure.

Screen Size & U.S. Standard Sieve Openings

Mesh	Microns	Inch
4	4760	0.187
6	3360	0.132
8	2380	0.0937
12	1680	0.0661
16	1190	0.0469
20	840	0.0331
30	590	0.0232
40	420	0.0165
50	297	0.0117
60	250	0.0098
70	210	0.0083
80	177	0.007
100	149	0.0059
120	125	0.0049
140	105	0.0041
170	88	0.0035
200	74	0.0029
230	62	0.0024
270	53	0.0021
325	44	0.0017
400	37	0.0014

Sieving results are expressed in terms of "mesh". A minus (-)before the number indicates material passing "through" a screen. A plus (+) before the number means "retained" on a screen. For example, "50% -200 +325" means 50% by weight of the material passes through a 200 mesh screen but are retained on a +325 mesh screen or 95%-100 means 95% by weight of the material passes through a 100 mesh sieve.

Screen analysis is of particular importance when using powdered, atomized or granular aluminum for pyrotechnic manufacture. As a general rule the following expressions classify aluminum screen analysis:

    COARSE................. 4 to 30 MESH

    MEDIUM................. 30 to 80 MESH

    FINE................... 80 to 120 MESH

Other definitions for coarse, medium, fine and extra fine:

    COARSE.................. 40 to 50 MESH

    MEDIUM.................. 50 to 100 MESH

    FINE.................... 100 to 200 MESH

    EXTRA FINE.............. 200 MESH AND DOWN

Please accept our appreciation and sincere thanks for letting us serve you. Sometimes, in the rush of business life we fail to say thank you loud enough. But you can be sure your patronage is never, never taken for granted. Our aim is to please and satisfy. To serve you is a real privilege and a pleasure.