Paraformaldehyde to Picric


Paraformaldehyde, EM Grade, Purified
(Polyoxymethylene)
OH(CH2O)n H F.W. Average: 600 CAS #30525-89-4
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RT | 19200 | Prill | 500g | 19.00 | Add to Cart |
RT | 19202 | Prill | kilo | 27.00 | Add to Cart |
RT | 19208 | Granular | 500g | 19.00 | Add to Cart |
RT | 19210 | Granular | kilo | 27.00 | Add to Cart |
Technical Tip

Paraformaldehyde Aqueous Solution -16% (Formaldehyde Aqueous Solution, 16%)
CAS #30525-89-4
Prepared from Paraformaldehyde crystal, 16% aqueous solution, methanol free. Microfiltered and stored in pre-scored ampoules.
CONTAINS NO PRESERVATIVES
RT | 15700 | 16% Paraformaldehyde (formaldehyde) aqueous solution | ![]() |
10 ml | 6.00 | Add to Cart |
RT | 15710 | 16% Paraformaldehyde (formaldehyde) aqueous solution | ![]() |
10x10 ml | 31.00 | Add to Cart |
RT | 15710-S | 16% Paraformaldehyde (formaldehyde) aqueous solution | 100 ml bottle | 30.00 | Add to Cart | |
RT | 15711 | 16% Paraformaldehyde (formaldehyde) aqueous solution | 10 bxs/lot | 280.00 | Add to Cart | |
RT | 15712 | 10% Paraformaldehyde (formaldehyde) aqueous solution | ![]() |
10x10 ml | 30.00 | Add to Cart |
RT | 15712-S | 10% Paraformaldehyde (formaldehyde) aqueous solution | 100 ml | 29.00 | Add to Cart | |
RT | 15713 | 20% Paraformaldehyde (formaldehyde) aqueous solution | ![]() |
10x10 ml | 34.00 | Add to Cart |
RT | 15713-S | 20% Paraformaldehyde (formaldehyde) aqueous solution | 100 ml | 33.00 | Add to Cart | |
RT | 15714 | 32% Paraformaldehyde (formaldehyde) aqueous solution | ![]() |
10x10 ml | 39.00 | Add to Cart |
RT | 15714-S | 32% Paraformaldehyde (formaldehyde) aqueous solution | 100 ml | 38.00 | Add to Cart |
We can prepare in accordance to your special requirements (any concentration desired). Call for more information.
See Formaldehyde Solution, for other standard concentrations.
In addition to our complete line of Formaldehyde solutions shown above we have now added to the line.
Since the DOT (Department of Transportation) has changed the definition of what a non dangerous solution of formaldehyde is to under 10%, we are now offering an 8% and a 4% solution. This will allow us to ship overnight as well as overseas without any hazardous charges saving our customers a good deal of money.
The quality of our 8% and 4% aqueous Paraformaldehyde solution is as good as all of the other concentrations that we offer.
CONTAINS NO PRESERVATIVES
RT | 157-4 | 4% Paraformaldehyde (formaldehyde) aqueous solution | ![]() |
10x10 ml | 27.00 | Add to Cart |
RT | 157-4-100 | 4% Paraformaldehyde (formaldehyde) aqueous solution | 100 ml | 26.00 | Add to Cart | |
RT | 157-8 | 8% Paraformaldehyde (formaldehyde) aqueous solution | ![]() |
10x10 ml | 26.00 | Add to Cart |
RT | 157-8-100 | 8% Paraformaldehyde (formaldehyde) aqueous solution | 100 ml | 25.00 | Add to Cart |


Paraformaldehyde-Glutaraldehyde Solution Karnovsky's Fixative
Ready To mix. Kit consists of: 2 x 10 ml ampoules 16% Formaldehyde 1 x 10 ml ampoules 50% Glutaraldehyde1x50 ml 0.2M Sodium Phosphate Buffer.
RT | 15720 | 1 kit | 28.00 | Add to Cart | |
RT | 15730 | Lot of 5 kits | 126.00 | Add to Cart |
Fixative Reagent Grade (Karnovsky's)
This fixative contains 3% glutaraldehyde and 2% formaldehyde in 0.1M phosphate buffer, pH 7.4.
Karnovsky's with formalin 2% and Biological glutaraldehyde 3% in 0.1m Phosphate Buffer.
RT | 15731-10 | Karnovsky Fixative Reagent Grade | 1 L | 260.00 | Add to Cart |
Karnovsky's with paraformaldehyde solution and EM grade glutaraldehyde
Please Note: This kit can be formulated to fit your requirements. Please contact us.
0-5°C | 15732-10 | Karnovsky Fixative EM Grade | 1 L | 286.00 | Add to Cart |
Paramat and Paramat Extra
Please see listing in Embedding Media for Histology and Light Microscopy.
Tissue-TEK Paraffin
Please see listing in Embedding Media.

Paraffin Wax, ParaPro Blue™
A specialized wax which consists of light blue pellets used specifically for small biopsy specimens, as well as for general use with all other tissues.
The ParaPro Blue offers better visualization of the tissue and allows for sectioning as low as 3µm thick. The melting point of the wax is 56°C and offers perfect ribbon continuity.
RT | 19310-01 | Paraffin Wax, ParaPro Blue | 1kg | 14.00 | Add to Cart |
RT | 19310-02 | Paraffin Wax, ParaPro Blue | 8kg/cs | 84.00 | Add to Cart |
Paraplast Embedding Medium


Paraplast X-tra
Handy pellet form melts rapidly. Melting Point 53-54°C. Cuts to 2 micron thickness with exceptional ribbon continuity. Extra compression resistance provides total support of tissues.
RT | 19214 | Paraplast X-tra | 1 kilo | 26.00 | Add to Cart |
RT | 19215 | Paraplast X-tra | 8 kilo | 170.00 | Add to Cart |

Paraplast Plus
Reduces infiltration time by one-third. Cuts to 2 micron thickness with excellent ribbon continuity. Convenient pellet form melts rapidly. Melting point 56°C. Double filtered. No need for filtration before use.
RT | 19216 | Paraplast Plus | 1 kilo | 24.00 | Add to Cart |
RT | 19217 | Paraplast Plus | 8 kilo | 152.00 | Add to Cart |

Paraplast Medium
Handy pellet form melts rapidly. Melting Point 56°C.
Cuts to 4 micron thickness with excellent ribbon continuity – no Crumbling or cracking.
Double filtered. No need for filtration before use.
RT | 19218 | Paraplast Medium | 1 kilo | 23.00 | Add to Cart |
RT | 19219 | Paraplast Medium | 8 kilo | 129.00 | Add to Cart |
Paraffin Waxes
For a continuation of our Paraffin Waxes, please see listing in Embedding Media.
Articles of Interest
Re-Embedding of Paraffin Embedded Specimens in Resin
Paraffin - Peel-A-Way® Embedding Wax
For our complete line of Embedding Waxes, please see Embedding Media for Histology and Light Microscopy.
PEG- GMA/PEG Embedding Kit
Please see listing in Embedding Media Kits.


Parlodion (Pyroxylin Purified
Strips)
C12H16N4O18 F.W. 504.28 CAS #9004-70-0
Highly purified from cellulose nitrate; specially prepared for embedding tissue for sectioning and for preparing semi-permeable membranes.
RT | 19220 | 10g | 180.00 | Add to Cart |
Parlodion 2% in Amyl Acetate
See Collodion, 2%.

Pepsin Reagent, Ready To Use
Description: Pepsin is used for proteolytic digestion of formalin-fixed paraffin-embedded (FFPE) tissue sections prior to application of antibodies. In IHC most commonly used fixative like formalin mask tissue antigens (cellular, membrane and nuclear) by cross-linking process, this results in poor or no staining in IHC. Pepsin digestion of FFPE tissue section improves accessibility of antibodies to tissue antigens.Storage: 2-8°C. DO NOT FREEZE
Intended Use:Use as antigen retriever for some antibodies in IHC. Please refer to primary antibody protocol for IHC.
Reagent: Ready-to-use Pepsin reagent available in 2 sizes: 15 and 100 ml
4-8°C | 64142-05 | Pepsin Reagent | 15 ml | 75.00 | Add to Cart |
4-8°C | 64142-06 | Pepsin Reagent | 100 ml | 145.00 | Add to Cart |

Periodic Acid, Reagent
H5IO6 F.W. 227.96 CAS #10450-60-9
Assay | >99.0% | |
Heavy Metals | .0.005% | |
Insoluble Matters | 0.01% | |
Iron | .0.003% | |
Other Halogen (Cl) | 0.01% | |
Residue after Ignition | 0.01% | |
Sulfate | 0.01% |
Used as a Fixative: Issidorides, M.R., and Kasorchis, T. (1981).
Dispersed and compact chromatin demonstrated with a new EM Method: phosphotungstic acid-hematoxylin block-staining. Histochemistry 73,21.
Used widely as a Negative Stain:
- As Spray method: Horne, R.W., and Pasquali-Ronchette, I. (1974). A negative staining-carbon film technique for studying viruses in the electron microscope.
- Preparation procedures for examining icosahedral and filamentous viruses. J. Ultrastruct. Res. 47, 361. Locke, M., and Kirhman, N. (1971).
- Hot Alcoholic phosphotungstic acid and uranyl acetate as routine stains for thick and thin sections. J. Cell Biol., 50, 550., Farragiana, T., and Marinozzi, V. (1979).
- Phosphotungstic acid staining of polysaccharides containing structures on epoxy embedded tissues. J. Submicrosc. Cytol. 11, 263.Bloom, E.E., And Aghajanian, G.K. (1968).
- Fine structural and cytochemical analysis of the staining of synaptic junctions with PTA. J. Ultrastruct. Res. 22, 261.
RT | 19325 | 25 g | 33.00 | Add to Cart |
Periodic Acid Solutions
Please see listing in Reagents for Histology.
Permount™ Mounting Medium
Please see listing in Adhesives and Mountants.


PHEM Buffer
EMS is proud to announce and release of our newest Buffer for EM PHEM.
PHEM buffer has been used primarily for tissues and cell cultures being processed for immunocytochemical studies. Most antigens, especially intra cellular ones, stain better using PHEM than those processed using PBS, it also has a more limited effect on biochemical reactions and enzymes. Very good preservation of cellular ultrastructure, notably microtubules, is also an advantage of PHEM use.
References:
- Schliwa, Manfred, and Jonathan Van Blerkom. "Structural interaction of cytoskeletal components." The Journal of Cell Biology 90.1 (1981): 222-235.
- Jacqueline Montanaro: Improved ultrastructure of marine invertebrates using non-toxic buffers
2-8°C | 11162 | PHEM Buffer, 0.1M | 225ml | 42.00 | Add to Cart |
2-8°C | 11163 | PHEM Buffer, 0.1M | 500ml | 74.00 | Add to Cart |
2-8°C | 11164 | PHEM Buffer, 0.2M | 225ml | 48.00 | Add to Cart |
2-8°C | 11165 | PHEM Buffer, 0.2M | 500ml | 82.00 | Add to Cart |

Phenol Red
(Phenolsulfonphthalein)
C19H14O5S F.W. 354.38 CAS #143-74-8
A standard indicator for preparing buffers, pH range 6.4-8.2.
RT | 19327 | 5 g | 18.00 | Add to Cart |

Phenol Red Sodium Salt
(Phenolsulfonphthalein Sodium Salt)
C19H13NaO5S F.W. 376.37 CAS #34487-61-1
A standard indicator for preparing buffers, pH range 6.8-8.2.
Assay | >99.0% | |
Water | <0.1% |
RT | 19328 | 5 g | 30.00 | Add to Cart |

(PMSF), Phenylmethylsulphonyl Fluoride
C6H5CH2SO2F F.W. 174.20 CAS #329-98-6
Assay | >99.0% | |
Water | <0.1% |
RT | 19330 | 1g | 24.00 | Add to Cart | |
RT | 19331 | 5g | 110.00 | Add to Cart |

Phosphate Mixed Sodium Salts 0.2 M Buffer
Please see listing in Prepared Buffers.
RT | 11600-05 | 500 ml | 23.00 | Add to Cart | |
RT | 11600-10 | 1 L | 32.00 | Add to Cart |

Phloxine B, Certified, C.N. #DcPh-6
(Acid Red 92; Cyanosine; Eosin 10B; Phloxine TA, N, BP Super, RB, TB, or BB)
C20H2O5Cl4Br4Na2 F.W. 829.66 CAS #18472-87-2
Solubility: 10.5% Water; 5.0% Alcohol; 9.0% Cellosolve; 4.5% Glycol; 0.0% Xylene
RT | 19350 | 25 g | 40.00 | Add to Cart |

Phosphomolybdic Acid, Crystal, Reagent, A.C.S.
(dodeca-Molybdophosphoric Acid)
H3PO4·12(MoO3)·24H2O F.W. 2257.6 CAS #51429-74-4
RT | 19400 | 100g | 58.00 | Add to Cart |
Phosphomolbdic Acid Solutions
Please see listing in Reagents for Histology.

Phosphotungstic Acid, Crystal, Reagent, Highest Purity
(Tungstophosphoric Acid)
H3[P(W3O10)4] aq F.W. 2880.17+aq CAS #12501-23-4
Specifications:
Appearance | Practically clear, colorless solution. |
|
Ammonia (NH ) | 0.004% | |
Chloride (Cl) | 0.03% | |
Insoluble Matter | 0.02% | |
Nitrate (NO3 ) | 0.004% | |
Sulfate (SO4 ) | 0.005% | |
Heavy Metals and Iron. | No color formation on addition of Hydrogen Sulfide |
Used as a Fixative:
Issidorides, M.R., and Kasorchis, T. (1981).
Dispersed and compact chromatin demonstrated with a new EM Method: phosphotungstic acid-hematoxylin block-staining. Histochemistry 73,21.
Used widely as a Negative Stain:
- As Spray method: Horne, R.W., and Pasquali-Ronchette, I. (1974). A negative staining-carbon film technique for studying viruses in the electron microscope.
- Preparation procedures for examining icosahedral and filamentous viruses. J. Ultrastruct. Res. 47, 361. Locke, M., and Kirhman, N. (1971).
- Hot Alcoholic phosphotungstic acid and uranyl acetate as routine stains for thick and thin sections. J. Cell Biol., 50, 550.,Farragiana, T., and Marinozzi, V. (1979).
- Phosphotungstic acid staining of polysaccharides containing structures on epoxy embedded tissues. J. Submicrosc. Cytol. 11, 263.Bloom, E.E., And Aghajanian, G.K. (1968).
- Fine structural and cytochemical analysis of the staining of synaptic junctions with PTA. J. Ultrastruct. Res. 22, 261.
RT | 19500 | Phosphotungstic Acid, Crystal, Reagent, Highest Purity | ![]() |
100g | 64.00 | Add to Cart |
Phosphotungstic Acid Solutions
Please see listing in Reagents for Histology.

Picric Acid, Reagent, Crystal, A.C.S.
(2,4,6-Trinitrophenol)
C6H2(NO2) 3OH FW 229.11 CAS #88-89-1
A.C.S. Specifications:
Water | min 30% | |
Melting Point (dried) | 121-123°C | |
Insoluble in Resinous Matter. | 0.01% | |
Insoluble in benzene | 0.1% | |
Sulfate | 0.01% |
RT | 19550 | 100g | 94.00 | Add to Cart |
Picric Acid Solutions
Please see listing in Reagents for Histology.