A lot of draw near the cosmetic of the expiration period, the discount is very fierce, petty gain arrives to dare not believe his eye. Face these brands that stand high above the masses at ordinary times, major small companionate metropolis is enchanted. But, some young associate may have doubt, these drawing near the product of the expiration period, can be use effect affected? The use that can you be at ease? Discriminate talks about this topic today.
A normal, eligible product, inside the expiration period, want to assure the stability of the product. If the product is stable, although draw near the expiration period, use effect also won't be affected. If the product is not stable, be about to be used cautiously. Normally the circumstance falls, the stability of cosmetic includes 3 fields: 1, microbial stability; 2, physical stability; 3 chemical stability.
Microbial stability
Microbial stability, tell popularly, it is the product is inside the expiration period, can assure microbial the legal provision that accords with a country. Bacterium, fungus microbial do not exceed bid.
Microbial stability, it is a product most one of fundamental standards. When developing a product, can producing considering the product, carry, goods shelves, use during waiting inside, the risk of microbial infection. The product is in before appearing on the market, can pass a series of anticorrosive challenge, can carry the product of anticorrosive challenge, below normal circumstance, stability is inside the expiration period, the microbial infection, odds that exceeds bid is very low.
Of course, now the on the market a few products that emphasize having antiseptic, what make appliance has anticorrosive effect for the most part is multivariate alcohol keeps wet agent anticorrosive. The anticorrosive effect of this kind of antiseptic is not so reliable, short-term and OK, time grew, still can have anticorrosive effect, level of unusual trial recipe and manufacturing technology. If processing is bad, put in the risk of microbial infection.
Additional, if be in for long high temperature, insolate the product is deposited in waiting for harsh environment, exceeded the limiting value with anticorrosive product, also put in the risk of microbial infection.
Overall for, if normal, eligible product, below normal inside the expiration period environment, the odds of microbial infection is very low, although draw near the expiration period, also need not worry.
Physical stability
Physical stability is to show the product won't produce physics to change. Physical stability is right the exterior of the product, use feel an effect very big. Different product, the target that physical stability includes is different also, overall for, look from intuitionistic angle, physical stability basically includes: Become rare, become stiff, grease depart, precipitation, agglomeration, sudoriferous, gelation, stripe is inhomogenous, volatilize, solid word, bate, chap. Attentive consumer, can from the exterior after opening a product, judge a product to produce change easily. If appear above phenomenon, the physical stability that shows a product produces change, do not suggest reuse.
Professional judges the change of product stability, besides seeing product surface, still meet the technical index according to a few, for instance: PH value, viscosity, opposite density, detached mark, will judge the physical stability of the product.
If a product just encountered extreme situation temporarily, for instance outdoors low temperature, the product freezes; Product short time lies high temperature condition, cream body begins to melt. If be only now and then, the product sets normal environment in, product exterior restores whack, need not worry. When the product is being developed, memory of meeting course high temperature and loop of aspic be in harmony check, carry the product of the test, if it were not for lies for long extreme environment, product physics stability won't be affected.
Normal the product of big plant, if be inside the expiration period, product physics stability still has assure, unless lie for long in extreme environment. If discover product exterior produces change, did not suggest to use. With respect to discriminate understanding, also have a few manufacturer, technical force is weaker, treat stability test to be perfunctory quite, be eager to short-term inside promote the product to the market, physical stability is not to have safeguard so.
Chemical stability
The chemical stability of a product, with the final result be closely bound up of the product. If the chemistry of the product produces change, this product and expectant action differ very far, lost use value, cannot continue to use.
Change has the product chemistry that can experience through odour and exterior: Become angry, fade, become smelly, release unidentified gas, bleb, active other people to decompose, combustion acid is defeated, mutual reaction waits content content a moment.
Normally the circumstance falls, as long as it is normal the product that big plant manufactures, the microbial stability of the product, physics stability has safeguard. But chemical stability is done not have so good, even if normal the product that big plant manufactures, draw near the expiration period, also want to make a question mark.
● is not special purpose cosmetic
Be not special purpose cosmetic, it is contented skin cleanness for the most part, protect wet wait for a foundation to nurse demand, effect sex is not strong. The stability of these composition is tall, laziness is strong, although be saved for a long time, should be in only assure period inside, chemical character can keep stable, won't produce change commonly, can be at ease use.
For instance clean kind of product, include range of discharge makeup, clean, wash dew of hair, bath, the core composition of this kind of product is the exterior activator that has clean capacity, property is stable, can save for a long time. Encounter dozen fold, the opportunity that check inventory, can buy buy.
A few keep wet product, for instance bright skin water, latex, cream, core composition is to keep wet agent + embellish skin lotion. These two kinds of composition compare stability normally, want to deserve to be become only, strict test is passed when development, save environmental stability, inside the expiration period, chemistry won't produce change commonly. Encounter dozen fold, the opportunity that check inventory, goods of OK and proper store up.
● special purpose cosmetic
The cosmetic of special purpose, it is hair pointing to Yo, catch hair, give or have a permanent wave, depilate, beautiful breast, strong and handsome, deodorization, beautiful spot of white, dispel, prevent the cosmetic that bask in. This kind of product has certain effect sex, need adds part of sex of a few functions. In numerous versatility composition, some stability are poor, be oxidized easily, decompose, degenerative. Just began production to come out, chemistry still calculates stability, what can carry a product is characteristic. But the elapse as time, jump over stability of in the future to jump over difference, to draw near when the expiration period, the active ingredient content that still has active already very low, affect the use result of the product directly. Buy this kind to draw near again the product of the expiration period, chickened ribs a bit.
In numerous beautiful white composition, VC and its ramification, ursine Guo Gan, 377, the composition such as music acid, in encounter heat, receive light, after treating water, stability is retentive time is very short, very easy oxidation, decompose, degenerative. Although recipe division is when the product that research and development contains these part, can use a variety of methods, prolong the life of active ingredient. But look from actual feedback, in draw near the expiration period, the part that still has active truly already place remnant very few. Rely on these products to go to the beauty white, weak spot, the effect cans be imagined.
In numerous beautiful white composition, pass amine of acyl of bright acid, smoke to attribute stabler part, 3 years are saved below normal circumstance, active ingredient still can be remained 90% , stability is very doughty.
Same, a few class status that refuse consenescence, get the influence of all sorts of elements, draw near the expiration period, the effect of active part can sell at a discount, affect the use result of the product.
Accordingly, to effect product, buy the product of newest birth date as far as possible, to drawing near the product of the expiration period, want to be bought cautiously. This kind of product although apparently look cheap, but the may be a like water off a duck's back empty shell that you buy.
Judge the stability of the product through the exterior
To average consumer, can judge the stability of a product through the exterior, main standard has: 1, color; 2, odour; 3, stick consistency; 4, physical condition.
● color
If a product expects the color of body begins to produce change, contain VC, VC to derive the composition, 377 products that wait for composition for instance, the look after unsealing fizzles out changeably, the product that contains hydrogenous Kun begins to pale, blacken. Appear these phenomena, the chemistry that shows part has produced change. Want to give out as soon as possible, at the same time commutation saves an environment. If color change is very big, active ingredient already place remnant very few, reoccupy this kind of product, the effect is very finite.
● odour
If a product appeared peculiar smell, for instance some cream frost, occurrence acid is defeated, the pungent flavour such as grease, show already microbial infection, the bacterium exceeds bid, throw away at once, do not want reoccupy.
● sticks consistency
Same, the product sticks consistency to change also is important judgement basis. If the product becomes rare, this is microbial affect or product structure is destroyed to cause. But also the product becomes stiff the circumstance of thickening happens. If feel the product sticks consistency to have apparent change, was about to be used cautiously.
● physics condition
Still have the change of condition of a few physics, feel the product has grain for instance generation, crystallization, piece oily, piece water, statified wait for phenomenal happening, explain the stability of the product has been destroyed, this kind of product does not want reoccupy.
On put together, to common cosmetic, although draw near the expiration period, want the exterior to do not have change only, can continue to use, won't affect final result. To having the special purpose cosmetic of effect sex, stability of partial active composition is differred, can elapse as time, be oxidized, decompose, degenerative, the influence uses the effect finally. This kind of product, manufacturing date has been jumped over newlier, do not suggest to buy draw near of the expiration period dozen discount a product.
Discriminate , cosmetic recipe division, pursue the hairdressing, trade that protect skin more than 15 years, advocate reason to protect skin, object following suit buy. Every week 5 not less than articles that protect skin are shared. (the article bottom in front has me... ) , there is entire implied meaning inside. You have any problems that protect skin, the welcome leaves a message me, have ask to answer surely.
