Whatman為特殊應用提供一系列纖維濾紙。這個產品線包括土壤分析和糖工業用濾紙。

Grade 0048
Filter mat made from a mixture of cellulose and polyester. This mat is used for optically testing baby food (artificial milk) for textile fibers.

Grade 72
Composite cellulose/glass filter loaded with activated carbon. Used to absorb radioactive iodine in air pollution monitoring and in nuclear installations.

Grade 287 ½
Kieselguhr paper with a medium to slow flow rate. Additional adsorption effect, e.g., for the separation of very fine semi-colloidal turbidity, for clarifying milk serum, starch solutions, soil suspensions or sugar-containing solutions prior to polarimetry or refractometry. Available prepleated.
硅藻土濾紙，慢中等流速。特殊的吸附效果，例如非常細小半膠狀渾濁的分離：澄清在偏振貨反射之前的奶粉、淀粉溶液、石油懸浮物或者含糖溶液。已折疊好的為Grade 287 ½，為折疊的未Grade 287。
Grade 551
Black colored paper with a medium to slow flow rate. Provides contrast for the detection of very fine traces of white precipitates.

黑色濾紙，慢中等流速，在測定非常細小微量的白色沉淀物時可形成背景反差。

Grade 2555 ½
A medium fast filter paper. Used for the filtration of the mash for the determination of the extract in malt and wort and for removing carbon dioxide from beer.

中速濾紙。用于過濾搗碎的麥芽和麥芽汁來測定提取物的活性碳酸鈣含量皮昂，取出啤酒中的二氧化碳。已折疊好的為Grade 2555 ½，為折疊的未Grade 2555。

Soil analysis filter papers

Grade 0790 ½
Acid-washed paper with ash content of approximately 0.01%, low magnesium, for the determination of trace elements (Mg, Mn, Co, Cu, Mo, B).

一種灰份含量大約為0.01%，鎂的含量很低，酸洗過的濾紙。用于微量金屬含量的測定。

Grade 512 ½
Low phosphate papers approximately 1.5 ppm phosphate, for the filtration of calcium lactate extracts from soil samples for the determination of K and P according to Egnér, Riehm and Lederle. Available prepleated.

Sugar/food industry filter papers

Grade 3000, 3002 and 3459
折疊或者光滑的過濾紙在相對高的流速時有很好的保留能力。他們被應用于以下澄清過濾：

• Dried beet pulp extracts 干甜菜廢絲的提取
• Beet juice after the addition of lead acetate for subsequent polarimetric sugar determination 在加入醋酸鉛之后用偏振測定甜菜的糖含量
• Grade 3459 is specifically designed for the Venema unit (lead acetate method) Grade3459是特別為Venema uniti（醋酸鉛方法）設計的