Is LR grade good enough for a recrystallisation solvent?

Usually yes. Recrystallisation removes most impurities from the product, and residual solvent is dried off. If the final compound is an analytical standard, a higher grade solvent reduces the risk of carrying over non-volatile residue.

Why does an LR product sometimes have a high assay?

Many LR chemicals are made from the same production run as purer grades but tested against fewer parameters. The assay can therefore be high, but impurities that are not listed on the specification have not been controlled.

Should teaching labs buy LR or AR?

For most practical classes LR is sufficient and cheaper. Titration experiments where students calculate a concentration benefit from AR grade primary standards, so many teaching labs keep a small stock of both.

Chemical grade

LR Grade (Laboratory Reagent) chemicals

Good-quality, economical chemicals for synthesis, teaching and general laboratory work where trace impurities do not matter.

157 products in this grade

LR Grade (Laboratory Reagent) products

97–120 of 157 products

Lanoline anhydrous, IP, LR

CAS: 8006-54-0

ZX-038668

Lead stearate, LR

CAS: 7428-48-0
Formula: C₁₈H₃₅O₂Pb⁺
MW: 491 g/mol

ZX-019595

Magnesium sulphate, IP/BP/USP/EP/Ph. Eur., LR, specially dried

CAS: 7487-88-9
Formula: MgO₄S
MW: 120.37 g/mol

ZX-038671

Manganese dioxide, LR, technical grade ≥70%

CAS: 1313-13-9
Formula: MnO₂
MW: 86.94 g/mol

ZX-038398

Mercury (I) nitrate dihydrate, LR

CAS: 7782-86-7
Formula: H₃HgNO₄⁺
MW: 281.62 g/mol

ZX-019507

MES buffer, LR

CAS: 4432-31-9
Formula: C₆H₁₃NO₄S
MW: 195.24 g/mol

ZX-019540

Metaphosphoric acid (40-50%) sticks, LR 50%

CAS: 10343-62-1
Formula: HO₃P
MW: 79.98 g/mol

ZX-019688

Methyl-2-chloropropionate, LR

CAS: 17639-93-9
Formula: C₄H₇ClO₂
MW: 122.55 g/mol

ZX-019691

Microcystin-LR

CAS: 101043-37-2
Formula: C₄₉H₇₄N₁₀O₁₂
MW: 995.2 g/mol

ZX-046525

N,N-Dimethyl cyclohexyn,N-dimethyl cyclohexylamine, LR

CAS: 98-94-2
Formula: C₈H₁₇N
MW: 127.23 g/mol

ZX-019681

N,N′-Methylenebis(acrylamide) powder, LR

CAS: 110-26-9
Formula: C₇H₁₀N₂O₂
MW: 154.17 g/mol

ZX-038313

Nickel (II) phosphate hydrate, LR

CAS: 27176-17-6
Formula: H₂Ni₃O₉P₂
MW: 384.04 g/mol

ZX-019531

Nickel sulphamate, LR

CAS: 13770-89-3
Formula: H₄N₂NiO₆S₂
MW: 250.87 g/mol

ZX-038686

o-Phthaldehyde, LR ≥97.00%

CAS: 643-79-8
Formula: C₈H₆O₂
MW: 134.13 g/mol

ZX-038333

Oxalic acid dihydrazide, LR

CAS: 996-98-5
Formula: C₂H₆N₄O₂
MW: 118.1 g/mol

ZX-038692

Perchloric Acid

CAS: 7601-90-3
Formula: ClHO₄
MW: 100.46 g/mol

ZX-018505

Phenazine methosulphate, LR, for spectroscopy ≥90.00%

CAS: 299-11-6
Formula: C₁₄H₁₄N₂O₄S
MW: 306.34 g/mol

ZX-038331

Phenolphthalein bisphosphate tetrasodium salt, LR 95.00–101.00%

CAS: 68807-90-9
Formula: C₂₀H₁₆Na₄O₁₂P₂
MW: 602.2 g/mol

ZX-038332

Phenyl phosphate disodium salt, LR

CAS: 3279-54-7
Formula: C₆H₅Na₂O₄P
MW: 218.05 g/mol

ZX-019696

Phenylanthranilic acid, LR

CAS: 91-40-7
Formula: C₁₃H₁₁NO₂
MW: 213.23 g/mol

ZX-038697

Poly(ethylene glycol) 600, USP, LR

CAS: 25322-68-3

ZX-038699

Potassium ethoxide solution 20% in ethanol, LR 20%

CAS: 917-58-8
Formula: C₂H₅KO
MW: 84.16 g/mol

ZX-019698

Potassium Iodide, IP, LR ≥99%

CAS: 7681-11-0
Formula: IK
MW: 166 g/mol

ZX-038399

Potassium lactate, LR 50%

CAS: 996-31-6
Formula: C₃H₅KO₃
MW: 128.17 g/mol

ZX-038711

Compare with other grades

HPLC Grade GC Grade AR Grade (Analytical Reagent)ACS Grade Extra Pure Grade Molecular Biology Grade Spectroscopy Grade LC-MS Grade IP Grade (Indian Pharmacopoeia)BP Grade (British Pharmacopoeia)USP Grade (United States Pharmacopeia)Ph. Eur. Grade (European Pharmacopoeia)Food Grade (FCC)Technical Grade Electronic Grade Deuterated and Stable-Isotope-Labelled Compounds Pharmaceutical Secondary Reference Standards Grades guide

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